Articoli di riviste: "CO2 chemical absorption"

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Saito, Satoshi. "CO2 Capture Technology by Chemical Absorption". MEMBRANE 47, n. 6 (2022): 317–22. http://dx.doi.org/10.5360/membrane.47.317.

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Lamas Galdo, M. I., J. D. Rodriguez García e J. M. Rebollido Lorenzo. "Numerical Model to Analyze the Physicochemical Mechanisms Involved in CO2 Absorption by an Aqueous Ammonia Droplet". International Journal of Environmental Research and Public Health 18, n. 8 (13 aprile 2021): 4119. http://dx.doi.org/10.3390/ijerph18084119.

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CO2 is the main anthropogenic greenhouse gas and its reduction plays a decisive role in reducing global climate change. As a CO2 elimination method, the present work is based on chemical absorption using aqueous ammonia as solvent. A CFD (computational fluid dynamics) model was developed to study CO2 capture in a single droplet. The objective was to identify the main mechanisms responsible for CO2 absorption, such as diffusion, solubility, convection, chemical dissociation, and evaporation. The proposed CFD model takes into consideration the fluid motion inside and outside the droplet. It was found that diffusion prevails over convection, especially for small droplets. Chemical reactions increase the absorption by up to 472.7% in comparison with physical absorption alone, and evaporation reduces the absorption up to 41.9% for the parameters studied in the present work.

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Ho, Chii-Dong, Luke Chen, Jr-Wei Tu, Yu-Chen Lin, Jun-Wei Lim e Zheng-Zhong Chen. "Investigation of CO2 Absorption Rate in Gas/Liquid Membrane Contactors with Inserting 3D Printing Mini-Channel Turbulence Promoters". Membranes 13, n. 12 (4 dicembre 2023): 899. http://dx.doi.org/10.3390/membranes13120899.

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The CO2 absorption by Monoethanolamine (MEA) solutions as chemical absorption was conducted in the membrane gas absorption module with inserting 3D mini-channel turbulence promoters of the present work. A mathematical modeling of CO2 absorption flux was analyzed by using the chemical absorption theory based on mass-transfer resistances in series. The membrane absorption module with embedding 3D mini-channel turbulence promoters in the current study indicated that the CO2 absorption rate improvement is achieved due to the diminishing concentration polarization effect nearby the membrane surfaces. A simplified regression equation of the average Sherwood number was correlated to express the enhanced mass-transfer coefficient of the CO2 absorption. The experimental results and theoretical predictions showed that the absorption flux improvement was significantly improved with implementing 3D mini-channel turbulence promoters. The experimental results of CO2 absorption fluxes were performed in good agreement with the theoretical predictions in aqueous MEA solutions. A further absorption flux enhancement up to 30.56% was accomplished as compared to the results in the previous work, which the module was inserted the promoter without mini channels. The influences of the MEA absorbent flow rates and inlet CO2 concentrations on the absorption flux and absorption flux improvement are also illustrated under both concurrent- and countercurrent-flow operations.

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Villarroel, Josselyne A., Alex Palma-Cando, Alfredo Viloria e Marvin Ricaurte. "Kinetic and Thermodynamic Analysis of High-Pressure CO2 Capture Using Ethylenediamine: Experimental Study and Modeling". Energies 14, n. 20 (19 ottobre 2021): 6822. http://dx.doi.org/10.3390/en14206822.

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One of the alternatives to reduce CO2 emissions from industrial sources (mainly the oil and gas industry) is CO2 capture. Absorption with chemical solvents (alkanolamines in aqueous solutions) is the most widely used conventional technology for CO2 capture. Despite the competitive advantages of chemical solvents, the technological challenge in improving the absorption process is to apply alternative solvents, reducing energy demand and increasing the CO2 captured per unit of solvent mass. This work presents an experimental study related to the kinetic and thermodynamic analysis of high-pressure CO2 capture using ethylenediamine (EDA) as a chemical solvent. EDA has two amine groups that can increase the CO2 capture capacity per unit of solvent. A non-stirred experimental setup was installed and commissioned for CO2 capture testing. Tests of the solubility of CO2 in water were carried out to validate the experimental setup. CO2 capture testing was accomplished using EDA in aqueous solutions (0, 5, 10, and 20 wt.% in amine). Finally, a kinetic model involving two steps was proposed, including a rapid absorption step and a slow diffusion step. EDA accelerated the CO2 capture performance. Sudden temperature increases were observed during the initial minutes. The CO2 capture was triggered after the absorption of a minimal amount of CO2 (~10 mmol) into the liquid solutions, and could correspond to the “lean amine acid gas loading” in a typical sweetening process using alkanolamines. At equilibrium, there was a linear relationship between the CO2 loading and the EDA concentration. The CO2 capture behavior obtained adapts accurately (AAD < 1%) to the kinetic mechanism.

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Dinul, Fadhilah Ikhsan, Hendri Nurdin, Dieter Rahmadiawan, Nasruddin, Imtiaz Ali Laghari e Tarig Elshaarani. "Comparison of NaOH and Na2CO3 as absorbents for CO2 absorption in carbon capture and storage technology". Journal of Engineering Researcher and Lecturer 2, n. 1 (27 aprile 2023): 28–34. http://dx.doi.org/10.58712/jerel.v2i1.23.

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CO2 gas is a greenhouse gas that causes global warming. Greenhouse gases are gases in the atmosphere that can absorb and reflect infrared radiation from the Earth's surface. Currently, the energy demand still depends on fossil fuels. On the other hand, CO2 emissions from burning fossil fuels continue to increase and contribute as greenhouse gases to the atmosphere. CO2 capture is an effort to reduce the burden of CO2 emissions into the atmosphere and is part of the Carbon, Capture, and Storage (CCS) protocol. The CO2 absorption process applied in the chemical industry is one of the CO2 absorptions using NaOH and Na2CO3 solutions as absorbents. This research aims to determine the effect of absorbent flow rate on the percentage of absorbed CO2. The method used in this research is the SLR (Systematic Literature Review) method to identify all available research. The absorbent flow rate variations used are 1 liter/minute, 1.5 liters/minute, 2 liters/minute, 2.5 liters/minute, and 3 liters/minute. The absorption process using NaOH absorbent is capable of absorbing CO2 gas with a maximum absorption of 95.52% and a minimum of 79.14%. Meanwhile, in the Na2CO3 absorbent, it is capable of absorbing CO2 gas with a maximum amount absorbed of 72.45% and a minimum of 35.47%.

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Ho, Chii-Dong, Hsuan Chang, Jr-Wei Tu, Jun-Wei Lim, Chung-Pao Chiou e Yu-Jie Chen. "Theoretical and Experimental Studies of CO2 Absorption in Double-Unit Flat-Plate Membrane Contactors". Membranes 12, n. 4 (29 marzo 2022): 370. http://dx.doi.org/10.3390/membranes12040370.

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Theoretical predictions of carbon dioxide absorption flux were analyzed by developing one-dimensional mathematical modeling using the chemical absorption theory based on mass-transfer resistances in series. The CO2 absorption into monoethanolamine (MEA) solutions was treated as chemical absorption, accompanied by a large equilibrium constant. The experimental work of the CO2 absorption flux using MEA solution was conducted in double-unit flat-plate membrane contactors with embedded 3D turbulence promoters under various absorbent flow rates, CO2 feed flow rates, and inlet CO2 concentrations in the gas feed stream for both concurrent and countercurrent flow operations. A more compact double-unit module with embedded 3D turbulence promoters could increase the membrane stability to prevent flow-induced vibration and enhance the CO2 absorption rate by overwhelming the concentration polarization on the membrane surfaces. The measured absorption fluxes with a near pseudo-first-order reaction were in good agreement with the theoretical predictions for the CO2 absorption efficiency in aqueous MEA solutions, which was shown to be substantially larger than the physical absorption in water. By embedding 3D turbulence promoters in the MEA feed channel, the new design accomplishes a considerable CO2 absorption flux compared with an empty channel as well as the single unit module. This demonstrates the value and originality of the present study regarding the technical feasibility. The absorption flux enhancement for the double-unit module with embedded 3D turbulence promoters could provide a maximum relative increase of up to 40% due to the diminution in the concentration polarization effect. The correlated equation of the average Sherwood number was obtained numerically using the fourth Runge–Kutta method in a generalized and simplified expression to calculate the mass transfer coefficient of the CO2 absorption in the double-unit flat-plate membrane contactor with turbulence promoter channels.

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Jamaludin, Siti Nabihah, e Ruzitah Mohd Salleh. "Research Trends of Carbon Dioxide Capture using Ionic Liquids and Aqueous Amine-Ionic Liquids Mixtures". Scientific Research Journal 13, n. 1 (30 giugno 2016): 53. http://dx.doi.org/10.24191/srj.v13i1.5442.

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Anthropogenic CO2 emissions has led to global climate change and widely contributed to global warming since its concentration has been increasing over time. It has attracted vast attention worldwide. Currently, the different CO2 capture technologies available include absorption, solid adsorption and membrane separation. Chemical absorption technology is regarded as the most mature technology and is commercially used in the industry. However, the key challenge is to find the most efficient solvent in capturing CO2. This paper reviews several types of CO2 capture technologies and the various factors influencing the CO2 absorption process, resulting in the development of a novel solvent for CO2 capture.

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Jamaludin, Siti Nabihah, e Ruzitah Mohd Salleh. "Research Trends of Carbon Dioxide Capture using Ionic Liquids and Aqueous Amine-Ionic Liquids Mixtures". Scientific Research Journal 13, n. 1 (1 giugno 2016): 53. http://dx.doi.org/10.24191/srj.v13i1.9382.

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Anthropogenic CO2 emissions has led to global climate change and widely contributed to global warming since its concentration has been increasing over time. It has attracted vast attention worldwide. Currently, the different CO2 capture technologies available include absorption, solid adsorption and membrane separation. Chemical absorption technology is regarded as the most mature technology and is commercially used in the industry. However, the key challenge is to find the most efficient solvent in capturing CO2. This paper reviews several types of CO2 capture technologies and the various factors influencing the CO2 absorption process, resulting in the development of a novel solvent for CO2 capture.

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Selvi, Pongayi, e Rajoo Baskar. "CO2 absorption in nanofluid with magnetic field". Chemical Industry and Chemical Engineering Quarterly, n. 00 (2020): 8. http://dx.doi.org/10.2298/ciceq181225008s.

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Acidic gases like CO2, SO2, NO2, H2S etc., are to be removed as these are polluting the atmosphere in one way or another by inducing temperature rise which further results in undesirable climatic change. Among all these gases CO2 is the most responsible for the environmental issues and its capture becomes prime importance. The objective of this work is the enhancement of the CO2 absorption by employing nanofluids in the presence of magnetic field. The nanofluid used in this work is Al2O3/water in the concentration of 0.0015 %. The maximum flux obtained is 0.014 mol/m2s(without magnetic field) and 0.015 mol/m2s(with magnetic field) for lower CO2 flow rate of 30 LPH. Hence the nanofluids along with magnetic field shows the positive performance towards the absorption of CO2.

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Lívanský, Karel. "Kinetics of pH equilibration in solutions of hydrogen carbonate during bubbling with a gas containing carbon dioxide". Collection of Czechoslovak Chemical Communications 50, n. 3 (1985): 553–58. http://dx.doi.org/10.1135/cccc19850553.

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The kinetics of the title process is approximated by differential equations based on kinetic and equilibrium data for carbon dioxide. The course of pH after a sudden change of the concentration of CO2 in the gas is calculated by numerical integration. The course of pH during absorption of CO2 is different from that during desorption. The course of pH during desorption calculated on the assumption that the rate of the noncatalysed hydration of CO2 is sufficient to ensure chemical equilibrium is in good agreement with experimental data from the literature. During absorption of CO2 in a solution of hydrogen carbonate, the chemical reaction rate is sometimes insufficient to ensure chemical equilibrium prior to pH measurement.

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Huang, Binxin. "Research progress of CO₂ separation technology by solvent absorption". E3S Web of Conferences 385 (2023): 04032. http://dx.doi.org/10.1051/e3sconf/202338504032.

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The combustion of fossil fuels emits a large amount of CO2, which causes the greenhouse effect and leads to global warming and poses a serious threat to life on earth. CO2 capture technology can effectively reduce the concentration of CO2 in the atmosphere, alleviate the greenhouse effect, and improve the environment. CO2 capture technologies include absorption, membrane separation and adsorption separation, among which chemical absorption and separation have the advantages of high efficiency, low cost and easy availability of materials. In this paper, the advantages and disadvantages of three main chemical absorption and separation methods (inorganic reagents, organic amines and ionic liquids) adsorb CO2 are summarized. Among inorganic adsorbents, NH3·H2O can achieve rapid and efficient absorption of CO2, and it is relatively stable and not easy to degrade. Common types of organic amine adsorbents are monoethanolamine, methanolamine, and sterically hindered amine. However, it is difficult for a single organic amine adsorbent to meet the requirements of high absorption rate, high absorption capacity and low reaction heat at the same time. Therefore, mixing organic amine absorbents with different characteristics can improve their performance in absorbing CO2. Ionic liquids have the advantages of good thermal stability, very low saturation vapor pressure, and designable structure, and are a new type of CO2 adsorbent, but ionic liquids have high viscosity themselves. Combining ionic liquids with organic or inorganic porous materials to form loaded ionic liquid materials, which can be used as CO2 adsorbent not only to improve the separation effect, but also to avoid the problem of high viscosity caused by direct absorption of ionic liquids, thus improving CO2 adsorption efficiency.

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Tran, Mai Lien, Chi Hieu Nguyen, Kuan-Yan Chu e Ruey-Shin Juang. "A Simplified Kinetic Modeling of CO2 Absorption into Water and Monoethanolamine Solution in Hollow-Fiber Membrane Contactors". Membranes 13, n. 5 (5 maggio 2023): 494. http://dx.doi.org/10.3390/membranes13050494.

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The absorption of CO2 from CO2-N2 gas mixtures using water and monoethanolamine (MEA) solution in polypropylene (PP) hollow-fiber membrane contactors was experimentally and theoretically examined. Gas was flowed through the lumen of the module, whereas the absorbent liquid was passed counter-currently across the shell. Experiments were carried out under various gas- and liquid-phase velocities as well as MEA concentrations. The effect of pressure difference between the gas and liquid phases on the flux of CO2 absorption in the range of 15–85 kPa was also investigated. A simplified mass balance model that considers non-wetting mode as well as adopts the overall mass-transfer coefficient evaluated from absorption experiments was proposed to follow the present physical and chemical absorption processes. This simplified model allowed us to predict the effective length of the fiber for CO2 absorption, which is crucial in selecting and designing membrane contactors for this purpose. Finally, the significance of membrane wetting could be highlighted by this model while using high concentrations of MEA in the chemical absorption process.

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Shokrollahi, Fatemeh, Kok Keong Lau e Behzad Partoon. "Experimental Evaluation of Chemical Reactions Involved in Ultrasonic-Assisted Absorption of Bulk CO2". Processes 11, n. 12 (22 novembre 2023): 3266. http://dx.doi.org/10.3390/pr11123266.

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As the most mature natural gas sweetening process, absorption has always been improved to meet the separation requirement. Recently, ultrasonic irradiation has been proposed as a technique that can intensify CO2 absorption. However, further studies are still required, particularly focusing on the sonochemical effect. Since the influence of the sonochemical effect on the reaction pathway is still debatable, attention must be given to verifying the influence of ultrasonic irradiation on the chemical reactions of CO2 absorption. Hence, this work aims to evaluate the influence of OH˙ radicals generated by the sonochemical effect on the chemical reactions involved during CO2 absorption using promoter-free methyldiethanolamine (MDEA). For the evaluation, various samples under irradiated and non-irradiated conditions are analyzed using the HPLC characterization technique. The results show that the hypothesis of changing the reaction pathway due to the presence of the sonochemical effect is invalid. However, it can accelerate the generation of hydroxyl radicals (OH˙) via water sonolysis. Thus, the origin of sonochemistry in aqueous solutions is defined as water sonolysis. The analysis of the CO2 absorption rate also demonstrates the presence of accelerated chemical reactions (contributed by the OH˙ radicals), which could potentially make the slow kinetic MDEA more practical for industrial application.

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Al-Marzouqi, M., M. El-Naas, S. Marzouk e N. Abdullatif. "Modeling of chemical absorption of CO2 in membrane contactors". Separation and Purification Technology 62, n. 3 (settembre 2008): 499–506. http://dx.doi.org/10.1016/j.seppur.2008.02.009.

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Fang, Mengxiang, Shuiping Yan, Zhongyang Luo, Mingjiang Ni e Kefa Cen. "CO2 chemical absorption by using membrane vacuum regeneration technology". Energy Procedia 1, n. 1 (febbraio 2009): 815–22. http://dx.doi.org/10.1016/j.egypro.2009.01.108.

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MIMURA, TOMIO, SHICHIRO SATSUMI, TAIICHIRO SUDA, MASAKI IIJIMA e SHIGEAKI MITSUOKA. "Optimum Operations of CO2 Recovery Process by Chemical Absorption." KAGAKU KOGAKU RONBUNSHU 24, n. 1 (1998): 1–4. http://dx.doi.org/10.1252/kakoronbunshu.24.1.

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Xu, Mimi, Shujuan Wang e Lizhen Xu. "Screening of physical-chemical biphasic solvents for CO2 absorption". International Journal of Greenhouse Gas Control 85 (giugno 2019): 199–205. http://dx.doi.org/10.1016/j.ijggc.2019.03.015.

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Gabitto, Jorge, e Costas Tsouris. "Carbon Dioxide Absorption Modeling for Off-Gas Treatment in the Nuclear Fuel Cycle". International Journal of Chemical Engineering 2018 (10 ottobre 2018): 1–11. http://dx.doi.org/10.1155/2018/3158147.

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The absorption of carbon dioxide is an important process in many practical applications such as reduction of greenhouse gases, separation and purification processes in the chemical and petroleum industries, and capture of radioactive isotopes in the nuclear fuel cycle The goal of this research is to develop a dynamic model to simulate CO2 absorption by using different alkanolamines as absorption solvents. The model is based upon transient mass and energy balances for the chemical species commonly present in CO2 gas-liquid absorption. A computer code has been written to implement the proposed model. Simulation results are discussed. The reported model simulates well the response to dynamic changes in input conditions. The proposed model can be used to optimize and control the separation of carbon-14 in the form of CO2 in the nuclear industry.

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Chavan, Sayali Ramdas, Patrick Perré, Victor Pozzobon e Julien Lemaire. "CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation". Membranes 11, n. 7 (30 giugno 2021): 496. http://dx.doi.org/10.3390/membranes11070496.

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Recently, membrane contactors have gained more popularity in the field of CO2 removal; however, achieving high purity and competitive recovery for poor soluble gas (H2, N2, or CH4) remains elusive. Hence, a novel process for CO2 removal from a mixture of gases using hollow fiber membrane contactors is investigated theoretically and experimentally. A theoretical model is constructed to show that the dissolved residual CO2 hinders the capacity of the absorbent when it is regenerated. This model, backed up by experimental investigation, proves that achieving a purity > 99% without consuming excessive chemicals or energy remains challenging in a closed-loop system. As a solution, a novel strategy is proposed: the pH Swing Absorption which consists of manipulating the acido–basic equilibrium of CO2 in the absorption and desorption stages by injecting moderate acid and base amount. It aims at decreasing CO2 residual content in the regenerated absorbent, by converting CO2 into its ionic counterparts (HCO3− or CO32−) before absorption and improving CO2 degassing before desorption. Therefore, this strategy unlocks the theoretical limitation due to equilibrium with CO2 residual content in the absorbent and increases considerably the maximum achievable purity. Results also show the dependency of the performance on operating conditions such as total gas pressure and liquid flowrate. For N2/CO2 mixture, this process achieved a nitrogen purity of 99.97% with a N2 recovery rate of 94.13%. Similarly, for H2/CO2 mixture, a maximum H2 purity of 99.96% and recovery rate of 93.96% was obtained using this process. Moreover, the proposed patented process could potentially reduce energy or chemicals consumption.

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Raksajati, Anggit, Minh Ho e Dianne Wiley. "Solvent Development for Post-Combustion CO2 Capture: Recent Development and Opportunities". MATEC Web of Conferences 156 (2018): 03015. http://dx.doi.org/10.1051/matecconf/201815603015.

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Chemical absorption is widely regarded as the most promising technology for post-combustion CO2 capture from large industrial emission sources with CO2 separation from natural gas using aqueous amine solvent system having been applied since the 1930s. The use of monoethanolamine (MEA) in CO2 absorption system possesses several drawbacks, such as high regeneration energy, high solvent loss, and high corrosion tendency. Various solvents have been developed for post-combustion CO2 capture application including the development of aqueous solvents and phase-change solvents. Some of these alternate solvents have been reported to have better solvent properties, which could improve the CO2 absorption system performance. This paper reviews key parameters involved in the design improvement of several chemical absorption process systems. In addition, some novel solvent systems are also discussed, for example encapsulated solvents systems. Some of the key solvent parameters that affect the capture performance, such as heat of reaction, absorption rate, solvent working capacity, solvent concentration, and solvent stability, are discussed in this paper, particularly in relation to the economic viability of the capture process. In addition, some guidelines for the future solvent development are discussed.

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SELVI, P. P., R. BASKAR e PRAVEEN S. NAIR. "ACID GAS ABSORPTION STUDIES IN PACKED COLUMN". JOURNAL OF ADVANCES IN CHEMISTRY 13, n. 10 (22 febbraio 2017): 6520–23. http://dx.doi.org/10.24297/jac.v13i10.5789.

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Carbon dioxide is a major greenhouse gas that results in climatic changes. Reducing CO2 emission for addressing the climatic change concerns is becoming increasingly important as the CO2 concentration in the atmosphere has increased rapidly since the industrial revolution. Many mitigation methods, including CO2 sequestration and novel CO2 utilization, are currently under investigation. Most of these processes require CO2 in a concentrated form. However the CO2 from large sources such as fossil fueled power plants is mixed with nitrogen, water vapor, oxygen and other impurities. The current commercial operations for capturing CO2 from flue gas use a chemical absorption method with Monoethanol Amine (MEA) as the sorbent. The method is expensive and energy intensive. The cost of capturing a ton of CO2 including removing impurities and compressing CO2 to supercritical pressure using existing MEA technology would be very high, and the power output would be significantly reduced by the energy consumption in capturing and compressing CO2. In this work alternative solvent ammonia, is used which can overcome the disadvantages of current technology using amines such as MEA and DEA.

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Park, Sangwon, Yeon-Sik Bong e Chi Wan Jeon. "Characteristics of Carbonate Formation from Concentrated Seawater Using CO2 Chemical Absorption Methodology". International Journal of Environmental Research and Public Health 18, n. 1 (26 dicembre 2020): 120. http://dx.doi.org/10.3390/ijerph18010120.

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Carbon capture and storage is a popular CO2-reduction technology, and carbon capture and utilization (CCU) technology has been reported frequently over the years. However, CCU has certain disadvantages, including the requirement of high energy consumption processes such as mineral carbonation. In addition, stable metal sources are required to fix CO2. This study used concentrated seawater to supply metal ions. In addition, the selected 5 wt % amine solution changed CO2 into aqueous CO2 to reduce the additional energy required to form the metal carbonate under moderate conditions. As a result, precipitates were formed because of the reaction of carbonate radicals with metal ions in the seawater. These precipitates were analyzed by X-ray diffraction and field-emission scanning electron microscopy, and they were found to mostly consist of CaCO3 and NaCl. Furthermore, it was verified that the conversion solution maintained its CO2-loading capacity even after the solids and liquid were filtered twice. Therefore, the proposed method permits a substantial reuse of CO2 and waste seawater when sufficient metal ions are supplied. Therefore, methods to improve their purity will be developed in future studies.

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Shokrollahi, Fatemeh, e Lau Kok Keong. "The influence of acoustic power on chemical absorption of CO2 using Slow Kinetic Solvent". E3S Web of Conferences 287 (2021): 01002. http://dx.doi.org/10.1051/e3sconf/202128701002.

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Ultrasonic Irradiation (UI) is an emerging technology that is used to assist the CO2 absorption process. Even for the slow kinetic solvents without using any chemical promoter, high-frequency UI might enhance mass transfer during the absorption process. For this purpose, it is essential to study the performance of a high-frequency ultrasonic-assisted absorption system under varied operating conditions. The ultrasonic power is considered as one of the main parameters during the absorption of CO2. Thus, in this paper, the influence of ultrasonic power is presented using Methyl diethanolamine (MDEA) as a chemical solvent. The ultrasonic power has been varied from 0 to 15.3 W. The results tend to show a significant absorption rate enhancement for higher ultrasonic power. Moreover, they prove that the high-frequency ultrasonic absorption system has high potential to be utilized to enhance the absorption using promoter-free MDEA.

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Wu, Guoqing, Ying Liu, Guangliang Liu e Xiaoying Pang. "The CO2 Absorption in Flue Gas Using Mixed Ionic Liquids". Molecules 25, n. 5 (25 febbraio 2020): 1034. http://dx.doi.org/10.3390/molecules25051034.

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Because of the appealing properties, ionic liquids (ILs) are believed to be promising alternatives for the CO2 absorption in the flue gas. Several ILs, such as [NH2emim][BF4], [C4mim][OAc], and [NH2emim[OAc], have been used to capture CO2 of the simulated flue gas in this work. The structural changes of the ILs before and after absorption were also investigated by quantum chemical methods, FTIR, and NMR technologies. However, the experimental results and theoretical calculation showed that the flue gas component SO2 would significantly weaken the CO2 absorption performance of the ILs. SO2 was more likely to react with the active sites of the ILs than CO2. To improve the absorption capacity, the ionic liquid (IL) mixture [C4mim][OAc]/ [NH2emim][BF4] were employed for the CO2 absorption of the flue gas. It is found that the CO2 absorption capacity would be increased by about 25%, even in the presence of SO2. The calculation results suggested that CO2 could not compete with SO2 for reacting with the IL during the absorption process. Nevertheless, SO2 might be first captured by the [NH2emim][BF4] of the IL mixture, and then the [C4mim][OAc] ionic liquid could absorb more CO2 without the interference of SO2.

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Spietz, Tomasz, Maira Kazankapova, Szymon Dobras, Zhanar Kassenova, Bolat Yermagambet, Andrey Y. Khalimon e Sławomir Stelmach. "Characterization of Humic Acid Salts and Their Use for CO2 Reduction". Minerals 14, n. 9 (18 settembre 2024): 947. http://dx.doi.org/10.3390/min14090947.

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The European Union aims to be climate neutral by 2050. To achieve this ambitious goal, net greenhouse gas emissions must be reduced by at least 55% by 2030. Post-combustion CO2 capture methods are essential to reduce CO2 emissions from the chemical industry, power generation, and cement plants. To reduce CO2, it must be captured and then stored underground or converted into other valuable products. Apromising alternative for CO2 reduction is the use of humic acid salts (HASs). This work describes a process for the preparation of potassium (HmK) and ammonium (HmA) humic acid salts from oxidized lignite (leonardite). A detailed characterization of the obtained HASs was conducted, including elemental, granulometric, and thermogravimetric analyses, as well as 1H-NMR and IR spectroscopy. Moreover, the CO2 absorption capacity and absorption rate of HASs were experimentally investigated. The results showed that the absorption capacity of the HASs was up to 10.9 g CO2 per kg. The CO2 absorption rate of 30% HmA solution was found to be similar to that of 30% MEA. Additionally, HmA solution demonstrated better efficiency in CO2 absorption than HmK. One of the issues observed during the CO2 absorption was foaming of the solutions, which was more noticeable with HmK.

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Peu, Susmita Datta, Arnob Das, Md Sanowar Hossain, Md Abdul Mannan Akanda, Md Muzaffer Hosen Akanda, Mahbubur Rahman, Md Naim Miah, Barun K. Das, Abu Reza Md Towfiqul Islam e Mostafa M. Salah. "A Comprehensive Review on Recent Advancements in Absorption-Based Post Combustion Carbon Capture Technologies to Obtain a Sustainable Energy Sector with Clean Environment". Sustainability 15, n. 7 (27 marzo 2023): 5827. http://dx.doi.org/10.3390/su15075827.

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CO2 capture, use, and storage have been identified as significant strategies for reducing greenhouse gas emissions induced by the usage of fossil fuels. The current review focuses on the concepts of post-combustion capture technologies based on absorption mechanisms. Among all other developed technologies, researchers have proposed absorption as the most mature carbon capture technology for industrial-scale application. Absorption-based carbon capture can be classified into chemical and physical absorption, and researchers have developed different solvents and absorbent materials to investigate their performance in CO2 capture. This paper comprehensively reviewed these established solvents and absorbents with their performance parameters in the CO2 absorption approach. Besides the improvement in widely applied absorbents such as amine-based absorbents, recently, researchers have been working to develop some advanced nanomaterials such as nanofluids and nano-emulsions. This review focuses on the application of such absorption mechanisms that can contribute to capturing CO2 in a compact, environment-friendly, and safe way. This paper also provides future research direction for further development in absorption-based CO2 capture.

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Yuswan, Muharam, Hamzah e Ramadhany Muhammad Audry. "Numerical Simulation of Carbon Dioxide Absorption by Monoethanolamine Solution with Super Mini Ring Contactor". Materials Science Forum 1000 (luglio 2020): 318–23. http://dx.doi.org/10.4028/www.scientific.net/msf.1000.318.

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Abstract (sommario):

Carbon capture storage provides an alternative to reducing global warming. In order to reduce the cost of carbon capture storage, high mass transfer packings for CO2 absorption from flue gas is an alternative. The study modeled and numerically simulated CO2 absorption by monoethanolamine solution with super mini ring contactor. The model considered the effect of the mass and momentum transfers, as well the chemical reaction. The simulation results show that the driving force of the reactive absorption is higher than the ordinary absorption in term of the low concentration of CO2 in the liquid phase. The CO2 concentration in the bulk gas is approximately 7.56 mol/m3. It decreases to around 5.75 mol/m3 after crossing the concentration boundary layer.

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28

Wang, Dongliang, Li Liu, Jiangpeng Xie, Yong Yang, Huairong Zhou e Xueying Fan. "A Coupling Calculation Method of Desorption Energy Distribution Applied to CO2 Capture by Chemical Absorption". Processes 12, n. 1 (15 gennaio 2024): 187. http://dx.doi.org/10.3390/pr12010187.

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The pursuit of low-energy-consumption CO2 capture technology has promoted the renewal and iteration of absorbents for chemical absorption. In order to evaluate the regeneration energy consumption of absorbents and obtain the distribution of energy consumption, a coupling method combining rigorous energy balance and simple estimation is proposed in this study. The data regarding energy balance and material balance from process simulation are transformed into the model parameters required in the simple estimation model. Regenerative energy consumption and distribution are determined by the empirical estimation formula. Two CO2 capture processes of an MEA aqueous solution and MEA–n-propanol aqueous solution (phase-change absorbent) were used to verify the feasibility and applicability of the coupling method. The effects of n-propanol concentration, CO2 loading in the lean solution, and temperature on energy consumption were discussed. The results show that the energy consumption of 30 wt% MEA aqueous solution is the lowest at 3.92 GJ·t−1-CO2 when CO2 load in the lean solution is 0.2 mol CO2·mol−1-MEA, and the reaction heat Qrec, sensible heat Qsen, and latent heat Qlatent were 1.97 GJ·t−1-CO2, 1.09 GJ·t−1-CO2, and 0.86 GJ·t−1-CO2, respectively. The lowest energy consumption of the phase-change absorbent with CO2 loading of 0.35 mol CO2·mol−1-MEA in the lean solution is 2.32 GJ·t−1-CO2. Qrec, Qsen, and Qlatent were 1.9 GJ·t−1-CO2, 0.29 GJ·t−1-CO2, and 0.14 GJ·t−1-CO2, respectively. This study provides a simple and meaningful method for accurately assessing absorber performance and process improvement, which can accelerate the development of economically viable, absorption-based CO2 capture processes.

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29

Nor Azira, Abdul Mum, e Asli Umi Aisah. "Purification of biohydrogen from fermentation gas mixture using two-stage chemical absorption". E3S Web of Conferences 90 (2019): 01012. http://dx.doi.org/10.1051/e3sconf/20199001012.

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Research on biohydrogen production via fermentation process has shown a tremendous progress for the past few years. As biohydrogen production is being established, the purification of biohydrogen should consider the process flow for future application. This paper presents an experimental study of biohydrogen purification using two-stage chemical absorption. The research work focuses on carbon dioxide (CO2) removal, which is a major unwanted fermentation gas product via activated methyldiethanolamine (MDEA) and caustic (NaOH) in two-stage chemical absorption. The experiment was conducted at low pressure of 1 bar and normal room temperature of 29 °C using a ratio of 1:1 of CO2:H2 standard gas mixture as the feed. In the first stage, 40 wt. % MDEA was activated by using piperazine (PZ) with the concentration between 2 and 10 wt. %, whereas 20 wt. % NaOH was used in the second stage. It was found that 6 wt. % of PZ was required to fully activate 40 wt. % MDEA, which resulted in 79% CO2 removal. To improve CO2 removal, a gas distributor and wire mesh packed were used to create gas bubbles at higher geometrical surface. The experimental study successfully removed 99.59% of the total CO2, producing >99 mol% hydrogen gas purity from the second stage that used 20 wt. % NaOH.

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30

See, Tan Lian, Tay Wee Horng, Kok Keong Lau e Mohd Shariff Azmi. "Modelling of High Pressure, High Concentration Carbon Dioxide Capture in Absorption Column". Applied Mechanics and Materials 773-774 (luglio 2015): 1138–42. http://dx.doi.org/10.4028/www.scientific.net/amm.773-774.1138.

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Abstract (sommario):

With the depletion of low carbon dioxide (CO2) content natural gas reserves, there is a pressing need to explore the vastly undeveloped high CO2 content natural gas reserves and reduce the release of greenhouse gas CO2 into environment. Our previous investigation on the absorption performance of CO2 at high concentration level of 50% from mixture of CO2-natural gas stream for 20wt% monoethanolamine (MEA) solution in countercurrent packed column indicated efficient removal at high pressure condition. In this present work, a combination mass transfer, chemical reaction of MEA as well as mass conservation equation was developed to model the removal behavior of the high pressure, high concentration CO2 capture along the absorption column. The model developed in this study had satisfactorily represented the mass transfer behavior for high pressure and high CO2 concentration gas removal along the absorption column.

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31

Wang, Junyao, Shuai Deng, Taiwei Sun, Yaofeng Xu, Kaixiang Li e Jun Zhao. "Thermodynamic and cycle model for MEA-based chemical CO2 absorption". Energy Procedia 158 (febbraio 2019): 4941–46. http://dx.doi.org/10.1016/j.egypro.2019.01.695.

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32

Jakfar, Husni Husin, Muhammad Zaki, Lia Mairiza, Mirna Zulrika, Fahrizal Nasution e Ahmadi. "Optimization Study of CO2 Gas Absorption with NaOH Absorbent Continuous System in Raschig Ring Packing Column Using Box–Behnken Design". Inventions 8, n. 3 (9 maggio 2023): 70. http://dx.doi.org/10.3390/inventions8030070.

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Abstract (sommario):

Increasing CO2 gas emissions results in climate change by increasing air temperature and worsening environmental problems. It is necessary to control CO2 gas in the air to overcome this. This research aims to optimize the absorption of CO2 gas in the air with 0.1 M NaOH absorbent in the tower of the Raschig ring stuffing material using the response surface methodology (RSM). This research was conducted using a continuous system of three independent variables by varying the contact time (10–80 min), the flow rate of NaOH absorbent (2–5 L/min), and the flow rate of CO2 gas (1–5 L/min). The response variables in this study were the absorption rate (L/min) and mass transfer coefficient, while the air flow rate was constant at 20 L/min. Air and CO2 gas mix before absorption occurs and flow into the Raschig ring packing column so that contact occurs with the NaOH absorbent. Mass transfer of CO2 gas occurs into the NaOH absorbent, resulting in absorption. The results showed that the effect of contact time (min), the flow rate of NaOH absorbent (L/min), and CO2 gas flow rate individually and the interaction on CO2 absorption rate and mass transfer coefficient were very significant at a p-value of 0.05. Chemical absorption of CO2 also occurred due to the reaction between CO2 and OH- to form CO32− and HCO3−, so the pH decreased, and the reaction was a function of pH. Optimization using Design Expert 13 RSM Box–Behnken Design (BBD) yielded optimal conditions at an absorption time of 80 min, NaOH absorbent flow rate of 5 L/min, CO2 gas flow rate of 5 L/min, absorption rate of CO2 gas of 3.97 L/min, and CO2 gas mass transfer coefficient of 1.443 mol/min m2 atm, with the desirability of 0.999 (≈100%).

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33

Ma’mun, S., Hallvard F. Svendsen e I. M. Bendiyasa. "Amine-based carbon dioxide absorption: evaluation of kinetic and mass transfer parameters". Journal of Mechanical Engineering and Sciences 12, n. 4 (27 dicembre 2018): 4088–97. http://dx.doi.org/10.15282/jmes.12.4.2018.08.0354.

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Abstract (sommario):

Global emission of carbon dioxide (CO2), a major contributor to the climate change, has increased annually and it reached over 37 Gt in 2017. An effort to reduce the emission, therefore, needs to be conducted, e.g. post-combustion capture by use of amine-based absorption. The objective of this study is to evaluate the kinetic and mass transfer parameters in a CO2 absorption process using monoethanolamine (MEA), 2-(methylamino)ethanol (MMEA), and 2-(ethylamino)ethanol (EMEA) as absorbents. The experiments were conducted in a bubble reactor at atmospheric pressure and 40 °C with 10-vol% CO2 flowrate of 5 NL/men. The CO2 concentration leaving the reactor was measured by an IR CO2 analyzer. The results obtained from this experiment were the overall absorption rates consisting of both chemical reaction and mass transfer. Analysis result shows that the reaction between CO2 and amines takes place fast, therefore the mass transfer of CO2 from the gas into the liquid through the gas film would control the overall absorption rate.

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34

Kh.A., Riskulov, Adilov T.T. e Uzokova Z.R. "Negative Effect Of Harmful Chemical Waste On Plant Development". American Journal of Interdisciplinary Innovations and Research 03, n. 03 (31 marzo 2021): 50–54. http://dx.doi.org/10.37547/tajiir/volume03issue03-08.

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At a high concentration of toxic gases in the air, the processes of photosynthesis stop immediately or after a few minutes. Excessive accumulation of heavy metals from the air and soil on the leaves and the retention of dust on the surface of the leaves sharply reduces the absorption of CO2 by plants, treatment with biologically active compounds accelerates biochemical reactions in plants, eliminating harmful substances.

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Rashid, Harith, Nurul Hasan e M. Iskandar Mohamad Nor. "Temperature Peak Analysis and Its Effect on Absorption Column for CO2 Capture Process at Different Operating Conditions". Chemical Product and Process Modeling 9, n. 2 (1 dicembre 2014): 105–15. http://dx.doi.org/10.1515/cppm-2013-0044.

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Abstract The role of temperature is important in CO2 capture processes. Unfortunately, detailed analysis on the temperature profile of the absorption column is scarce in the literature. Important factors like CO2 capture capacity and corrosion rate directly depend on temperature of the column. Many side reactions such as solvent degradation, formation of stable salts, corrosion and reduction in CO2 capture are prominent at a higher temperature. This study reports a broad study on the temperature profile for CO2 capture process based on a detailed mathematical model, Kent–Eisenberg vapor–liquid equilibrium (VLE) model. This model is quite accurate in calculating CO2 capture for any specific operating condition. Results produced from Kent–Eisenberg VLE model are consistent with experimental data. This study reports temperature profiles of an absorption column for different operating conditions. Moreover, it was found that CO2 absorption is more effective at low and ambient temperatures than at high temperature confirmed by a peak temperature in all cases and in the lower section of the column, which is attributed to exothermic CO2 absorption in monoethanolamine. This temperature variation of the column will be helpful in designing CO2 capture plants.

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36

Selvi, P. P., e R. Baskar. "CO2 mitigation studies in packed absorption column using iron oxide nano fluid". Chemical Industry and Chemical Engineering Quarterly, n. 00 (2022): 23. http://dx.doi.org/10.2298/ciceq210510023s.

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Abstract (sommario):

The challenging task in our ecosystem is to reduce acidic gas emissions to some extent. Many gases are emitted from the industries like H2S, CO, CO2, SO2, NO, and NO2 as exhaust gases. Among these gases CO2, NO2 and SO2 are known as acidic gases which result in adverse effects on human beings, animals, and plants. Owing to the increase in the emission of CO2 gases from both anthropogenic and industrial sources, it has resulted in CO2 mitigation studies. CO2 absorption studies have been carried out by employing iron oxide nanofluid with the novel structured packed absorption column. Iron oxide nanoparticles were synthesized and characterized using XRD analysis, SEM analysis, and TEM analysis. Ammonia is used as an absorbent along with iron oxide nanofluid of three different concentrations (0.0001 w/v%, 0.001 w/v%, and 0.0015 w/v%). It was found that the iron oxide nanofluid of 0.0015 w/v% showed an improved % CO2 removal efficiency. This enhanced % CO2 removal efficiency was due to the increased interfacial area of the ameliorated contact between the liquid and gas phase. Along with the packed column the magnetic field was introduced, which resulted in increased % CO2 removal efficiency of 1.5%.

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37

Asendrych, Dariusz, Paweł Niegodajew e Stanisław Drobniak. "CFD Modelling of CO2 Capture in a Packed Bed by Chemical Absorption". Chemical and Process Engineering 34, n. 2 (1 giugno 2013): 269–82. http://dx.doi.org/10.2478/cpe-2013-0022.

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The paper deals with numerical modelling of carbon dioxide capture by amine solvent from flue gases in post-combustion technology. A complex flow system including a countercurrent two-phase flow in a porous region, chemical reaction and heat transfer is considered to resolve CO2 absorption. In order to approach the hydrodynamics of the process a two-fluid Eulerian model was applied. At the present stage of model development only the first part of the cycle, i.e. CO2 absorption was included. A series of parametric simulations has shown that carbon dioxide capture efficiency is mostly influenced by the ratio of liquid (aqueous amine solution) to gas (flue gases) mass fluxes. Good consistency of numerical results with experimental data acquired at a small-scale laboratory CO2 capture installation (at the Institute for Chemical Processing of Coal, Zabrze, Poland) has proved the reliability of the model.

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38

Huang, Junhua, e Thomas Rüther. "Why are Ionic Liquids Attractive for CO2 Absorption? An Overview". Australian Journal of Chemistry 62, n. 4 (2009): 298. http://dx.doi.org/10.1071/ch08559.

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As the climate debate is hotting up, so is the (re)search for finding powerful new materials for the efficient and cost-effective removal of CO2 from flue-gas streams from power plants and other emission sources. Ionic liquids (ILs), exhibiting higher CO2 solubility than conventional organic solvents, have received considerable interest as new CO2 absorbents. The present paper evaluates the advantages and disadvantages of ILs, and provides an overview of the recent developments of ILs for CO2 capture. In conventional ILs, CO2 is absorbed by occupying the free space between the ions through physical absorption mechanisms. As another promising strategy, task-specific ILs have been studied that, by attaching functional groups to the ions, allow the formation of chemical bonds to improve the overall absorption capacity during the CO2 capture process. Other strategies include using ILs as reaction media or as selective absorption materials.

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Rambe, H. S., I. Irvan, B. Trisakti, T. bin Nur, M. S. Cahyono e M. N. Aridito. "CO₂ absorption using aqueous potassium carbonate (K₂CO₃) promoted by piperazine (PZ) in packed column reactor". IOP Conference Series: Earth and Environmental Science 1352, n. 1 (1 maggio 2024): 012024. http://dx.doi.org/10.1088/1755-1315/1352/1/012024.

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Abstract Carbon dioxide (CO2) is the main contributor in gases that can reduce the heating value and the greenhouse effect on the atmosphere. Several CO2 absorption technologies can be used to reduce CO2 content. Chemical absorption have selectivity and a high absorption rate. This research will study the effect of the addition piperazine (PZ) into 30wt % potassium carbonate (K2CO3) at 30 °C, 40 °C and 50 °C, PZ (1, 3 and 5) % and absorbent flow rate (1, 1.5 and 2) L min−1. The research was conducted in packed column made of stainless steel with height 150 cm and a diameter 9.6 cm filled with packing-type raschig rings made of ceramic arranged randomly to expand the contact between gas and absorbent during CO2 absorption. The process is carried in counter-current, gas streamed at constant flow rate 50 L min−1 from the bottom and absorbent with composition K2CO3, PZ and distilled water streamed from top of column. CO2 loading and CO2 removal in the sample were determined by acid-base titration. The results showed 5% PZ CO2 loading 0.0664 mole CO2/mole K2CO3 and CO2 removal 92.7575% at operating conditions 50 °C and absorbent flow rate 2 L min−1. The addition 5% PZ can increase CO2 removal 16.9525%.

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40

Al-dabusi, Bashir, Abdulozez Arzoga e Ali Abusalloua. "MODELLING OF CO2 ABSORPTION IN GAS TREATMENT UNITS". Scientific Journal of Applied Sciences of Sabratha University 1, n. 1 (27 dicembre 2018): 67–80. http://dx.doi.org/10.47891/sabujas.v1i1.67-80.

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The combustion of fossil fuel produces large amounts of carbon dioxide (CO2) gas that must be removed due to its environmental impacts. The absorption of CO2 in alkanolamine solution of mono-ethanolamine (MEA) is considered the most effective separation process. In this paper, a model of CO2 separation from a gas stream by a solution of MEA in a packed tower has been mathematically developed for unsteady state predictions. The rate-base model has been adopted as it considers the entire phenomenon occurring during the absorption process. The methodology of the dynamic modelling of the isothermal CO2 chemical absorption was created. The results were obtained in terms of the CO2 partial pressure and the MEA concentration gradients against the column height and time. In addition, the effect of the MEA concentration to the CO2 partial pressure ratio and the liquid to gas flow rate ratio on the column performance has been investigated. The developed model has been validated for the steady state operation of experimental data where satisfied agreement has been noticed.

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41

Ban, Zhen Hong, Lau Kok Keong e Azmi Mohd Shariff. "Physical Absorption of CO₂ Capture: A Review". Advanced Materials Research 917 (giugno 2014): 134–43. http://dx.doi.org/10.4028/www.scientific.net/amr.917.134.

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Abstract (sommario):

Removal of CO2 had been one of the main issues facing in worldwide. Intensive researches are still going on to effectively reduce CO2 at low cost. Physical absorption is one of the well-established technologies used to removal CO2 from other gases. The physical absorption process is simple; whereby it contains only one gas liquid contactor and a series of flash tank to regenerate solvent. The CO2 will be absorbed in the physical solvent in the high pressure gas liquid contactor and flashed out in the medium and low pressure flash tank. The advantage of using physical solvent is that the CO2 is absorbed without any chemical reaction involved, thus it can be flashed out easily by reducing the pressure, passing inert gas through the solvent and mild thermal regeneration. The physical absorption is the best operated at high pressure and low temperature as the solubility of CO2 in the solvent is high at the particular condition. Researches carried out currently are focusing on solvent development, absorption and desorption process development and mathematical modeling.

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42

Vadillo, José Manuel, Guillermo Díaz-Sainz, Lucía Gómez-Coma, Aurora Garea e Angel Irabien. "Chemical and Physical Ionic Liquids in CO2 Capture System Using Membrane Vacuum Regeneration". Membranes 12, n. 8 (15 agosto 2022): 785. http://dx.doi.org/10.3390/membranes12080785.

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Abstract (sommario):

Carbon Capture Utilization and Storage technologies are essential mitigation options to reach net-zero CO2 emissions. However, this challenge requires the development of sustainable and economic separation technologies. This work presents a novel CO2 capture technology strategy based on non-dispersive CO2 absorption and membrane vacuum regeneration (MVR) technology, and employs two imidazolium ionic liquids (ILs), [emim][Ac] and [emim][MS], with different behavior to absorb CO2. Continuous absorption–desorption experiments were carried out using polypropylene hollow fiber membrane contactors. The results show the highest desorption behavior in the case of [emim][Ac], with a MVR performance efficiency of 92% at 313 K and vacuum pressure of 0.04 bar. On the other hand, the IL [emim][MS] reached an efficiency of 83% under the same conditions. The MVR technology could increase the overall CO2 capture performance by up to 61% for [emim][Ac] and 21% for [emim][MS], which represents an increase of 26% and 9%, respectively. Moreover, adding 30%vol. demonstrates that the process was only favorable by using the physical IL. The results presented here indicate the interest in membrane vacuum regeneration technology based on chemical ILs, but further techno-economic evaluation is needed to ensure the competitiveness of this novel CO2 desorption approach for large-scale application.

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43

Liu, Yudong, Guizhou Ren, Honghong Shen, Gang Liu e Fangqin Li. "Technology of CO2 capture and storage". E3S Web of Conferences 118 (2019): 01046. http://dx.doi.org/10.1051/e3sconf/201911801046.

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Abstract (sommario):

This paper studies carbon capture and storage based on carbon emission. There are three main technical routes for CO2 emission reduction: pre-combustion capture, oxygen-rich combustion, and post-combustion capture; CO2 separation technology mainly includes: chemical absorption method, solid adsorption method, membrane separation method. CO2 capture needs to be transported to a special place for storage, which can be generally divided into geological storage, marine storage and chemical storage. Future carbon capture research will focus on cost savings and energy savings.

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44

Epp, B., H. Fahlenkamp e C. Stankewitz. "CO2-Absorption mit Aminlösung per Membrankontaktor". Chemie Ingenieur Technik 80, n. 10 (ottobre 2008): 1579–82. http://dx.doi.org/10.1002/cite.200800061.

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45

Duan, Yizhong, Yang Liu, Haonan Liu, Zhan Shi, Xinran Shen, Xiantong Sun, Shixin Zhao, Shuiping Yan e Feihong Liang. "CO2 absorption performance of biogas slurry enhanced by biochar as a potential solvent in once-through CO2 chemical absorption process". Carbon Capture Science & Technology 13 (dicembre 2024): 100317. http://dx.doi.org/10.1016/j.ccst.2024.100317.

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46

Ho, Chii-Dong, Hsuan Chang, Yu-Han Chen, Thiam Leng Chew e Jui-Wei Ke. "Investigation on the Performance of CO2 Absorption in Ceramic Hollow-Fiber Gas/Liquid Membrane Contactors". Membranes 13, n. 2 (19 febbraio 2023): 249. http://dx.doi.org/10.3390/membranes13020249.

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Abstract (sommario):

The absorption efficiencies of CO2 in ceramic hollow-fiber membrane contactors using monoethanolamine (MEA) absorbent under both cocurrent- and countercurrent-flow operations were investigated theoretically and experimentally; various MEA absorbent flow rates, CO2 feed flow rates, and inlet CO2 concentrations were used as parameters. Theoretical predictions of the CO2 absorption flux were analyzed by developing the mathematical formulations based on Happel’s free surface model in terms of mass transfer resistances in series. The experiments of the CO2 absorption were conducted by using alumina (Al2O3) hollow-fiber membranes to confirm the accuracy of the theoretical predictions. The simplified expression of the Sherwood number was formulated to calculate the mass transfer coefficient of the CO2 absorption incorporating experimental data. The data were obtained numerically using the fourth-order Runge–Kutta method to predict the concentration distribution and absorption rate enhancement under various fiber packing configurations accomplished by the CO2/N2 stream passing through the fiber cells. The operations of the hollow-fiber membrane contactor encapsulating N = 7 fiber cells and N = 19 fiber cells of different packing densities were fabricated in this work to examine the device performance. The accuracy derivation between experimental results and theoretical predictions for cocurrent- and countercurrent-flow operations were 1.31×10−2≤E≤4.35×10−2 and 3.90×10−3≤E≤2.43×10−2, respectively. A maximum of 965.5% CO2 absorption rate enhancement was found in the module with embedding multiple fiber cells compared with that in the device with inserting single-fiber cell. Implementing more fiber cells offers an inexpensive method of improving the absorption efficiency, and thus the operations of the ceramic hollow-fiber membrane contactor with implementing more fiber cells propose a low-priced design to improve the absorption rate enhancement. The higher overall CO2 absorption rate was achieved in countercurrent-flow operations than that in cocurrent-flow operations.

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Shokrollahi, F., K. K. Lau, W. H. Tay e L. S. Lai. "Power Measurement by Calorimetric Method Using Water Infrequency Range Between 1.7 Mhz To 3 Mhz". International Journal of Engineering & Technology 7, n. 3.32 (26 agosto 2018): 106. http://dx.doi.org/10.14419/ijet.v7i3.32.18404.

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Absorption is one of the most established processes for CO2 capturing. However, the current technologies used in this process suffer from several drawbacks. Meanwhile, the ultrasound technique is proposed as a new alternative technology to assist the CO2 absorption process due to both its physical and chemical effects. Yet, the chemical effect is still under developments. Between all the influencing parameters, the ultrasonic power and the frequency are the vital key parameters to investigate sonochemical effects during the CO2 absorption process. The aim of this paper is to measure the ultrasonic power of an ultrasonic vessel. The total electrical power measured by using the voltage and the flow. Simultaneously, the ultrasonic power determined by using the calorimetric method. The measurements were done by using water with different volumes and repeated for three different frequencies. The results showed that almost 51% of the electrical power converted into the ultrasonic power and were independent of liquid volume.

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Monde, Junety, Tri Widjaja e Ali Altway. "Effect of Promoter Concentration on CO2 Separation Using K2CO3 With Reactive Absorption Method in Reactor Packed Column". MATEC Web of Conferences 156 (2018): 02002. http://dx.doi.org/10.1051/matecconf/201815602002.

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Abstract (sommario):

The presence of carbon dioxide (CO2) in the gas is not expected because CO2 can reduce heating value and CO2 is the major emission contributor into the atmosphere. Various separation technologies can be used to reduce CO2 content and improve quality of gas. Chemical or reactive absorption is most widely used because it provides higher removal rate. This paper will study the effect of the addition di ethanolamine (DEA) concentration into aqueous 30wt.% potassium carbonate(K2CO3) with reactive absorption method in a reactor packed column at temperature from 40°C to 80°C, DEA concentration range of (1% - 3%) and absorbent flow rate (0.5, 0.75 and 1) L. min1. Contacting the gas and absorbent are countercurrent flow in packed column with 1.5 m high and 50 mm in diameter. The absorption column was randomly packed with a packing material raschig rings 5 mm in diameter. The CO2 loading in the liquid samples was determined by titration. It is found that the best result of CO2 loading is 0.065594 mole/mole K2CO3 and CO2 removal 28%. The result show that the loading capacity (mole CO2/mole K2CO3) and CO2 removal increased with the increase of DEA concentration.

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Rajiman, Viga, Hairul Nazirah Abdul Halim, Azmi Mohd Shariff, Muhammad Zubair Shahid, Abdulhalim Shah Maulud, Kok Keong Lau e Lian See Tan. "CO2 Absorption from Biogas Using Piperazine-Promoted 2-Amino-2-methyl-1-propanol: Process Performance in a Packed Column". Sustainability 14, n. 12 (9 giugno 2022): 7095. http://dx.doi.org/10.3390/su14127095.

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In this work, CO2 absorption from simulated biogas is investigated using different blends of a PZ + AMP solution in an absorption system at CO2 partial pressures ranging between 20 and 110 kPa. The collected data were presented as CO2 removal profiles along the packed column and were evaluated in terms of CO2 removal efficiency (%) and average overall volumetric mass transfer coefficient in the gas phase (KGav¯). An increased PZ concentration in the AMP solution was found to significantly increase the CO2 removal efficiency and KGav¯ values. It was observed that, when conducted at different CO2 partial pressures, gas and liquid flow rates, and chemical concentrations, the Lamine/GCO2 ratio strongly influenced the process behaviour in the packed column. Additionally, the optimal inlet liquid temperature was observed to be 35 ± 2 °C in this study.

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Gabitto, Jorge Federico, e Costas Tsouris. "Reaction Temperature Manipulation as a Process Intensification Approach for CO2 Absorption". Energies 16, n. 18 (10 settembre 2023): 6522. http://dx.doi.org/10.3390/en16186522.

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Reactor temperature manipulation to increase product yields of chemical reactions is a known technique used in many industrial processes. In the case of exothermic chemical reactions, the well-known Le Chatelier’s principle predicts that a decrease in temperature will displace the chemical reaction toward the formation of products by increasing the value of the equilibrium constant. The reverse is true for endothermic reactions. Reactor temperature manipulation in an industrial system, however, affects the values of many variables, including physical properties, transport parameters, reaction kinetic parameters, etc. In the case of reactive absorption, some variables change with increasing temperatures due to solute absorption, while others change in such a way that the solute absorption rate decreases. For example, temperature drop increases product formation for exothermic reactions but reduces the value of transport parameters, leading to decreasing interfacial concentrations and absorption rates. Therefore, temperature manipulation strategies must be designed carefully to achieve the process goals. In this work, we theoretically study the use of temperature as a tool to increase CO2 absorption by solvents in a semi-batch reactor. A computer code has been developed and validated using reported experimental data. Calculated results demonstrate an increase in absorbed CO2 of more than 28% with respect to the highest temperature used. Despite high agitation and high gas flow rate, the system is mass transfer controlled at short times, becoming kinetically controlled as time increases. An operating strategy to decrease cooling energy costs is also proposed. This study reveals that reactor temperature manipulation can be an effective process to improve CO2 absorption by solvents in two-phase semi-batch reactors.

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