Articoli di riviste: "Absorption chimique du CO2"

1

Joly, Lilian, Olivier Coopmann, Vincent Guidard, Thomas Decarpenterie, Nicolas Dumelié, Julien Cousin, Jérémie Burgalat et al. "The development of the Atmospheric Measurements by Ultra-Light Spectrometer (AMULSE) greenhouse gas profiling system and application for satellite retrieval validation". Atmospheric Measurement Techniques 13, n. 6 (12 giugno 2020): 3099–118. http://dx.doi.org/10.5194/amt-13-3099-2020.

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Abstract. We report in this paper the development of an embedded ultralight spectrometer (<3 kg) based on tuneable diode laser absorption spectroscopy (with a sampling rate of 24 Hz) in the mid-infrared spectral region. This instrument is dedicated to in situ measurements of the vertical profile concentrations of three main greenhouse gases – carbon dioxide (CO2), methane (CH4) and water vapour (H2O) – via standard weather and tethered balloons. The plug and play instrument is compact, robust, cost-effective, and autonomous. The instrument also has low power consumption and is non-intrusive. It was first calibrated during an in situ experiment on an ICOS (Integrated Carbon Observation System) site for several days, then used in two experiments with several balloon flights of up to 30 km altitude in the Reims region of France in 2017–2018 in collaboration with Météo-France CNRM (Centre National de Recherches Météorologiques). This paper shows the valuable interest of the data measured by the AMULSE (Atmospheric Measurements by Ultra-Light Spectrometer) instrument during the APOGEE (Atmospheric Profiles of Greenhouse Gases) measurement experiment, specifically for the vertical profiles of CO2 and CH4, measurements of which remain very sparse. We have carried out several experiments showing that the measured profiles have several applications: the validation of simulations of infrared satellite observations, evaluating the quality of chemical profiles from chemistry transport models (CTMs) and evaluating the quality of retrieved chemical profiles from the assimilation of infrared satellite observations. The results show that the simulations of infrared satellite observations from IASI (Infrared Atmospheric Sounding Interferometer) and CrIS (Cross-track Infrared Sounder) instruments performed in operational mode for numerical weather prediction (NWP) by the radiative transfer model (RTM) RTTOV (Radiative Transfer for the TIROS Operational Vertical Sounder) are of good quality. We also show that the MOCAGE (Modèle de Chimie Atmosphérique de Grande Echelle) and CAMS (Copernicus Atmospheric Monitoring Service) CTMs modelled ozone profiles fairly accurately and that the CAMS CTM represents the methane in the troposphere well compared to MOCAGE. Finally, the measured in situ ozone profiles allowed us to show the good quality of the retrieved ozone profiles by assimilating ozone-sensitive infrared spectral radiances from the IASI and CrIS.

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Friedmann, G., Y. Guilbert e J. M. Catala. "Modification chimique de polymères en milieu CO2 supercritique". European Polymer Journal 36, n. 1 (gennaio 2000): 13–20. http://dx.doi.org/10.1016/s0014-3057(99)00011-7.

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Fdil, F., J. J. Aaron, N. Oturan, A. Chaouch e M. A. Oturan. "Dégradation photochimique d'herbicides chlorophenoxyalcanoïques en milieux aqueux". Revue des sciences de l'eau 16, n. 1 (12 aprile 2005): 123–42. http://dx.doi.org/10.7202/705501ar.

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La dégradation photochimique de cinq herbicides appartenant à la famille des chlorophénoxyalcanoïques a été étudiée en solution aqueuse par irradiation à 254 nm selon trois systèmes : UV seul, UV/H2O2 et UV/H2O2/ FeIII (photo-Fenton). Le procédé photochimique semble constituer une alternative prometteuse aux méthodes existantes de traitement chimique des eaux polluées; en effet il permet de détruire photochimiquement l'herbicide initial et d'obtenir, dans les conditions opératoires initiales, sa minéralisation complète en CO2 et H2O. Il s'agit d'un procédé d'oxydation avancé, utilisant comme agent oxydant, des radicaux OH. produits in situ photochimiquement. L'évolution de la composition chimique des solutions d'herbicides étudiés a été suivie par chromatographie liquide à haute performance (CLHP). La minéralisation a été évaluée par mesure de la demande chimique en oxygène (DCO) et par le dosage des ions chlorures libérés. La cinétique de photodégradation, la nature et l'évolution des produits formés ainsi que le rendement du procédé ont été déterminés.

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Yan, Shuiping, Qingyao He, Wenchao Wang e Shefeng Li. "CO2 Absorption Using Biogas Slurry: CO2 Absorption Enhancement Induced by Biomass Ash". Energy Procedia 114 (luglio 2017): 890–97. http://dx.doi.org/10.1016/j.egypro.2017.03.1232.

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5

Villeret, Murielle. "Optical-absorption spectrum ofCdGa2Se4:Co2+". Physical Review B 39, n. 14 (15 maggio 1989): 10236–38. http://dx.doi.org/10.1103/physrevb.39.10236.

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Kim, Hyung-Gon, e Wha-Tek Kim. "Optical absorption ofZnGa2S4andZnGa2S4:Co2+crystals". Physical Review B 41, n. 12 (15 aprile 1990): 8541–44. http://dx.doi.org/10.1103/physrevb.41.8541.

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Nagano, Yatsuhisa, Tetsu Kiyobayashi e Tomoshige Nitta. "CO2 absorption in C60 solid". Chemical Physics Letters 217, n. 3 (gennaio 1994): 186–90. http://dx.doi.org/10.1016/0009-2614(94)80005-7.

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8

Thamsiriprideeporn, Chanakarn, e Suekane Tetsuya. "Development of CO2 Absorption Using Blended Alkanolamine Absorbents for Multicycle Integrated Absorption–Mineralization". Minerals 13, n. 4 (30 marzo 2023): 487. http://dx.doi.org/10.3390/min13040487.

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The present study aimed to investigate the feasibility of blended amine absorbents in improving the CO2 alkanolamine-based absorption of multicycle integrated absorption–mineralization (multicycle IAM) under standard operating conditions (20–25 °C and 1 atm). Multicycle IAM is a promising approach that transforms CO2 emissions into valuable products such as carbonates using amine solvents and waste brine. Previously, the use of monoethanolamine (MEA) as an absorbent had limitations in terms of CO2 conversion and absorbent degradation, which led to the exploration of blended alkanolamine absorbents, such as diethanolamine, triethanolamine, and aminomethyl propanol (AMP) combined with MEA. The blended absorbent was evaluated in terms of the absorption performance and carbonate production in continuous cycles of absorption, precipitation/regeneration, and preparation. The results showed that the fourth cycle of the blend of 15 wt.% AMP and 5 wt.% MEA achieved high CO2 absorption and conversion efficiency, with approximately 87% of the absorbed CO2 being converted into precipitated carbonates in 43 min and a slight degradation efficiency of approximately 45%. This blended absorbent can improve the efficiency of capturing and converting CO2 when compared to the use of a single MEA, which is one of the alternative options for the development of CO2 capture and utilization in the future.

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Liu, Lili, Yongsheng Ji, Zhanguo Ma, Furong Gao e Zhishan Xu. "Study on the Effects of Ultrasonic Agitation on CO2 Adsorption Efficiency Improvement of Cement Paste". Applied Sciences 11, n. 15 (26 luglio 2021): 6877. http://dx.doi.org/10.3390/app11156877.

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To realize high-efficiency CO2 absorption by fresh cement paste, ultrasonic vibration technology is introduced into the CO2 absorption test device used in this study. Influences of ultrasonic frequency on the CO2 absorption rate (CO2 AR) and the ultimate absorption amount of fresh cement paste are analyzed. Furthermore, the influencing laws of the CO2 absorption amount (CO2 AA) on the fluidity, pore distribution, and mechanical properties of cement paste under ultrasonic vibrating agitation are analyzed by measuring the variations of the CO2 AA of cement paste. Results demonstrate that ultrasonic vibrating agitation not only can increase the CO2 AR and ultimate absorption amount of fresh cement paste, but also can optimize the internal pore structure of materials and compressive strength of cement-based materials.

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Jin, Mei, Li Yan Zhou, Ping Lu, Jin Huang Wang e Guo Xian Yu. "Performance of MDEA-PZ-TETA for Absorption and Desorption of CO₂". Advanced Materials Research 864-867 (dicembre 2013): 1721–24. http://dx.doi.org/10.4028/www.scientific.net/amr.864-867.1721.

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The absorption performance of CO2 from the simulated flue gas using fresh MDEA-PZ-TETA absorbent and the desorption behavior of CO2 from the CO2-saturated absorbent were investigated. In the process of CO2 absorption, the absorption temperature and the inlet flow rate of CO2 played important effects on the absorption performance. The experimental results showed that the suitable absorption condition of CO2 using fresh absorbent was the absorption temperature of 20 oC for 18 min and the inlet flow rate of CO2 of 50 mL/min. In the process of CO2 desorption from the used absorbent, the desorption temperature played an important role and the regeneration time had little effect on the desorption behavior. The suitable desorption condition was the desorption temperature of 105 oC for 1.0 h and the regeneration time of 1.

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11

Charney, A. N., e R. W. Egnor. "Membrane site of action of CO2 on colonic sodium absorption". American Journal of Physiology-Cell Physiology 256, n. 3 (1 marzo 1989): C584—C590. http://dx.doi.org/10.1152/ajpcell.1989.256.3.c584.

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Increases in ambient CO2 tension increase colonic sodium absorption by increasing mucosal to serosal sodium flux. We examined the membrane site of CO2 action by utilizing the polyene antibiotic nystatin to create aqueous pores in the apical membrane. Under these conditions, the basolateral rather than the apical membrane is rate limiting for sodium absorption. Pairs of stripped rat distal colonic segments were mounted in modified Ussing chambers in a Ringer-HCO3 solution gassed with either 3% CO2-97% O2 or 11% CO2-89% O2. Mucosal-to-serosal 22Na and 36Cl fluxes were measured under short-circuited conditions, and ouabain-sensitive absorption was calculated before and after the addition of mucosal nystatin 300 U/ml. Ouabain-sensitive sodium absorption was fivefold greater at 11% CO2 than at 3% CO2 before nystatin addition. Nystatin increased short-circuit current (Isc), transcolonic conductance (Gt) and ouabain-sensitive sodium absorption at 3% CO2 but only increased Isc and Gt at 11% CO2. The levels of sodium absorption at 3% and 11% CO2 after nystatin were equal and identical to the level measured at 11% CO2 in the absence of nystatin. Ouabain-sensitive chloride absorption was similar at 3% and 11% CO2 in the absence of nystatin and was not affected by nystatin addition. These findings suggest that ambient CO2 tension affects colonic sodium absorption by a selective action at the apical membrane.

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Tagwale, Pranav, Vibhas Bambroo, Rituja Bande, Prasad Rathod e S. T. Mali. "POTENTIAL OF CARBON DIOXIDE ABSORPTION IN CONCRETE". International Journal of Students' Research in Technology & Management 3, n. 5 (27 settembre 2015): 369–72. http://dx.doi.org/10.18510/ijsrtm.2015.357.

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Abstract: Cement industry contributes to 5% of global CO2 emissions. To mitigate pollution, there is a need of CO2 sequestration into stable forms. Present research focusses on CO2 being channelized towards an important construction practice. This paper summarizes the potential of CO2 absorption in concrete. To verify CO2 absorption in concrete, an artificial CO2 environment for curing of concrete cubes using dry ice was created. Considering concrete of M20 grade, a comparative experimental study of water cured concrete cubes, CO2 cured concrete cubes, for penetration (using phenolphthalein indicator), and compressive strength was carried out. The result analysis of the tests indicated that CO2 cured concrete cubes showed 22.125% higher compressive strength than water cured concrete cubes and CO2 penetration of 13.5 mm after 2 hours. The rate of CO2 penetration and strength gain in concrete was found to be rapid in the early hours. It is shown that CO2 can prove to be a useful resource in the construction scenario, especially in the precast.

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Pongayi Ponnusamy Selvi and Rajoo Baskar, Pongayi Ponnusamy Selvi and Rajoo Baskar. "Mass Transfer Enhancement for CO2 Absorption in Structured Packed Absorption Column". Journal of the chemical society of pakistan 41, n. 5 (2019): 820. http://dx.doi.org/10.52568/000803/jcsp/41.05.2019.

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The acidic gas, Carbon dioxide (CO2) absorption in aqueous ammonia solvent was carried as an example for industrial gaseous treatment. The packed column was provided with a novel structured BX-DX packing material. The overall mass transfer coefficient was calculated from the absorption efficiency of the various runs. Due to the high solubility of CO2, mass transfer was shown to be mainly controlled by gas side transfer rates. The effects of different operating parameters on KGav including CO2 partial pressure, total gas flow rates, volume flow rate of aqueous ammonia solution, aqueous ammonia concentration, and reaction temperature were investigated. For a particular system and operating conditions structured packing provides higher mass transfer coefficient than that of commercial random packing.

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14

Li, Fang Qin, Ji Yong Liu, Xiao Feng Zhang, Jian Xing Ren e Jiang Wu. "The Effects of Operation Parameters on CO₂ Removal Efficiency by Membrane Method". Advanced Materials Research 955-959 (giugno 2014): 2326–29. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.2326.

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On the membrane contactor test unit, chose monoethanolamine (MEA) as absorption solution to absorb CO2 of simulated flue gases, studied effects of operating parameters on CO2 capture. Operating parameters included initial CO2 contents in flue gas, flue gas flow and absorption solution flow. Experimental results showed that: the greater the absorption of fluid flow, the higher the CO2 removal rate;While the greater the flue gas flow or the higher the initial CO2 concentration in flue gas, the lower the CO2 removal rate. In order to study the influence of the regeneration solution on CO2 absorption efficiency, regeneration experiments were done. Since the loss of solvent in regeneration solution, CO2 removal efficiency by regeneration solution was lower than that by original absorption solution.

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Mazri, Nur Azni Farhana, A. Arifutzzaman e Mohamed Kheireddine Aroua. "EXPERIMENTAL INVESTIGATION OF AMINE-BASED GRAPHENE NANOSUSPENSION FOR CO2 ABSORPTION". Malaysian Journal of Science 43, sp1 (31 luglio 2024): 15–19. http://dx.doi.org/10.22452/mjs.vol43sp1.3.

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Absorption is the most widely used carbon dioxide (CO2) removal technology. The CO2 absorption performance of monoethanolamine (MEA), the most commonly used CO2 absorbent, can be improved by suspending nanoparticles. This work examined the performance of graphene nanoplatelets (GNPs) as additives to enhance CO2 absorption in MEA. The GNPs were characterized by HRTEM, FTIR, and XRD. The study examined the influence of GNP concentrations on CO2 absorption at room temperature. The images from HRTEM confirmed that the implemented graphene consists of several layers of graphene sheets. Increasing the loading of particles increased the solubility of CO2 until the optimum concentration was reached. From this work, it is evident that incorporating GNPs into MEA enhances the CO2 absorption performance of MEA. Thus, the addition of nanoparticles to the absorbent can enhance its CO2 absorptivity.

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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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Muhd Nor, Nik Hisyamudin, Seiji Yokoyama e Minoru Umemoto. "Storage of CO₂ in Low Al₂O₃ EAF Oxidizing Slag by Grinding with Vibration Mill". Materials Science Forum 654-656 (giugno 2010): 2927–30. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2927.

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The investigation of the behavior of CO2 absorption into the low Al2O3 electric arc furnace (EAF) oxidizing slag under wet grinding was investigated in this paper. The slag was wet ground in the vibration ball mill in the presence of CO2 at room temperature. The observation of the CO2 absorption was made with constant pressure method. The CO2 absorption increased steeply in the early stage of grinding. It occurred simultaneously with the grinding and immediately ceased when the grinding was stopped. The CO2 absorption occurred at the interface between the slag and the water which was saturated with CO2. The CO2 absorption increased as the finer particles were formed by the grinding process, and as the interface between slag and water was increased by the vibration process. A large amount of CO2 absorption and high conversion ratio was observed in the oxidizing slag with low Al2O3 in comparison with those of the slag with the high Al2O3 content.

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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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Zhang, Wei Feng, e Jian Hui Shu. "Experimental Study of CO₂ Sequestration Using Glycinate-TEA". Applied Mechanics and Materials 522-524 (febbraio 2014): 396–400. http://dx.doi.org/10.4028/www.scientific.net/amm.522-524.396.

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The experimental study on the mechanism of CO2 absorption and desorption was tested by two kinds of glycinate (SG and PG) with TEA. The absorption and regeneration of CO2 by mixed absorption liquid were tested and compared with each other. The results showed that a low concentration of TEA in the SG and PG increased CO2 absorption capacity of mixed absorption solution. Addin more TEA on PG or SG lowered CO2 absorption capacity of mixed absorption solution. Desorption of PG didnt change with TEA. The low concentration of TEA had a role in promoting the desorption of mixed absorption solution (SG+TEA), and the high concentration of TEA inhibited the desorption of mixed absorption solution (SG+TEA).

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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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Aguilar, Manuel Jiménez. "Organic Wastes to Increase CO2 Absorption". International Journal of Clean Coal and Energy 03, n. 04 (2014): 47–53. http://dx.doi.org/10.4236/ijcce.2014.34005.

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Aksenov, Igor, Tetsuya Kai, Nobuyuki Nishikawa e Katsuaki Sato. "Optical Absorption of Co2+in CuAlS2". Japanese Journal of Applied Physics 32, Part 2, No. 4A (1 aprile 1993): L516—L519. http://dx.doi.org/10.1143/jjap.32.l516.

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Kim, Wha-Tek, Chang-Sub Chung, Yong-Geun Kim, Moon-Seog Jin e Hyung-Gon Kim. "Optical absorption ofZnGa2Se4:Co2+single crystals". Physical Review B 38, n. 3 (15 luglio 1988): 2166–68. http://dx.doi.org/10.1103/physrevb.38.2166.

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Kornev, I., J. P. Rivera, S. Gentil, A. G. M. Jansen, M. Bichurin, H. Schmid e P. Wyder. "Optical absorption of Co2+ in LiCoPO4". Physica B: Condensed Matter 270, n. 1-2 (ottobre 1999): 82–87. http://dx.doi.org/10.1016/s0921-4526(99)00158-1.

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Benhamou, D., e L. Beydon. "Absorption du CO2 : principes et utilisation". Annales Françaises d'Anesthésie et de Réanimation 6, n. 5 (gennaio 1987): 375–77. http://dx.doi.org/10.1016/s0750-7658(87)80357-x.

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Freeman, Brice, Pingjiao Hao, Richard Baker, Jay Kniep, Eric Chen, Junyuan Ding, Yue Zhang e Gary T. Rochelle. "Hybrid Membrane-absorption CO2 Capture Process". Energy Procedia 63 (2014): 605–13. http://dx.doi.org/10.1016/j.egypro.2014.11.065.

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Ahmad, A. L., A. R. Sunarti, K. T. Lee e W. J. N. Fernando. "CO2 removal using membrane gas absorption". International Journal of Greenhouse Gas Control 4, n. 3 (maggio 2010): 495–98. http://dx.doi.org/10.1016/j.ijggc.2009.12.003.

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Yu, Hai, Qunyang Xiang, Mengxiang Fang, Qi Yang e Paul Feron. "Promoted CO2 absorption in aqueous ammonia". Greenhouse Gases: Science and Technology 2, n. 3 (23 aprile 2012): 200–208. http://dx.doi.org/10.1002/ghg.1280.

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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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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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Sylvia, Novi, Anisa Anisa e Lukman Hakim. "Simulasi Aliran Kolom Absorpsi untuk Proses Penyerapan CO2 dengan Absorben Air menggunakan Computational Fluid Dynamics (CFD)". Jurnal Teknologi Kimia Unimal 7, n. 1 (29 gennaio 2019): 1. http://dx.doi.org/10.29103/jtku.v7i1.1167.

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To increasing the heating value of biogas and natural gas on industry needed a way to separate the carbon dioxide (CO2) use technology absorption. Many methods have been used to absorb the CO2 that has been researched, but most still use the absorption process in batch system. Therefore, this research will be conducted on the process of absorption of carbon dioxide (CO2) and water (H2O) will be simulated using Computational Fluid Dynamic (CFD). This research aims to test the performance of column absorption absorption on the process of carbon dioxide (CO2) and uses Autodesk Inventor 2016 and Fluent 16.0 to model the absorption and the pressure drop on the absorption column. This research was conducted with varying influence of the flow rate of water and carbon dioxide by comparison 2:1, i.e. CO2 117.75; 141.3 ;188.4 liters/min and H2O 235.5; 282.6 and 376.8 liters/minute.The results obtained show that the Percent of the maximum absorption i.e. 45.89% of flow rate of CO2 occurs at 117.75 liters/minute and H2O at 235.5 litres/minute, while the percent the minimum absorption i.e. 28.32% occurred at a flow rate of CO2 188.4 liters/minute and H2O 376.8 liters/minute. The highest pressure drop occurs at 188.4 liters/minute flow rate of CO2 and H2O 376.8 liters/minute, with a value of ∆P 0.66 atm, while the lowest pressure drop occurs at 177.75 liters/minute of CO2 and H2O at 235.5 litres/minute with the value of ∆P 0.17 atm.Key words: absorption, water, Computational Fluid Dynamic, carbon dioxide, pressure drop

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Liu, Xiangwei, Qian Ao, Shengyou Shi e Shuie Li. "CO₂ capture by alcohol ammonia based deep eutectic solvents with different water content". Materials Research Express 9, n. 1 (1 gennaio 2022): 015504. http://dx.doi.org/10.1088/2053-1591/ac47c6.

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Abstract The existing CO2 absorption by deep eutectic solvents is limited by the unavoidable water absorption problem during use. In this study, we prepared three deep eutectic solvents with different alcohol aminations and added different water contents to discuss the effect of water content on the absorption of carbon dioxide by deep eutectic solvents. All deep eutectic solvents have a low melting point at room temperature as a liquid and have high thermal stability, where the choline chloride-diethanolamine deep eutectic solvents have a high viscosity. Anhydrous choline chloride-monoethanolamine deep eutectic solvents have the largest CO2 absorption, reaching 0.2715 g g−1, and the absorption of CO2 by anhydrous choline chloride-N-methyldiethanolamine deep eutectic solvents is only 0.0611 g g−1. Water content inhibited the absorption of CO2 in primary amine and secondary amine systems, whereas it enhanced the absorption of CO2 in tertiary amine systems, which was related to the reaction process of deep eutectic solvent and CO2.

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Sun, Zhi Guo, Hong Yong Xie e Zhong Ping Xu. "CO₂ Sequestration in Mixtures of Sodium Humate and Waste Gypsum". Applied Mechanics and Materials 448-453 (ottobre 2013): 634–37. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.634.

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A novel process of CO2 sequestration in mixtures of sodium humate (HA-Na) and waste gypsum was proposed. Experiments investigated the CO2 absorption properties for HA-Na solution. HA-Na solution shows great performance in CO2 absorption, and the CO2 absorption amount reaches to 0.96 mol for 3 hours with 100 mL HA-Na solution (0.04 g/mL), at the condition of 15 °C, gas flow rate of 40 mL/h. the CO2 sequestration mechanism by HA-Na and desulfurization gypsum (DG) was analyzed. CaSO4 plays a key role in the CO2 absorption by HA-Na solution. A permanent method of CO2 sequestration is achieved by the mixtures of HA-Na and waste gypsum.

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34

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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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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Liu, Lili, Yongsheng Ji, Furong Gao e Zhishan Xu. "Research on Influences of Ultrasonic Vibration Agitation Stirring on Carbonation Resistance of Cement-Based Materials after Absorption of CO2". Applied Sciences 13, n. 7 (27 marzo 2023): 4256. http://dx.doi.org/10.3390/app13074256.

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To disclose influences of ultrasonic vibration agitation on the carbonation resistance of cement-based materials after absorption of CO2, the variation laws in internal carbonization zone were explored by the testing carbonization depth and carbonization range (pH variation range) of cement mortar after CO2 absorption at different ages. Results demonstrated that when CO2 absorption volumes of the cement mortar before carbonization were 0.44%, 0.88%, 1.32%, 1.76%, and 2.20% (28 d), the carbonization depth under ultrasonic vibration decreased by 5.5%, 12.3%, 21.7%, 20.7%, and 26.7% compared to those under mechanical stirring, respectively. When the ultimate CO2 absorption volume increased to 2.2% of cement mass, the extended degree of cement mortar was 103.23 mm, which decreased by 5.4% compared to that before CO2 absorption. pH variation values of the carbonization range under ultrasonic vibration presented a rising trend with the increase of CO2 absorption volume of cement mortar before carbonation. This indicated that, with the increase of CO2 absorption volume of cement mortar before carbonation increases under ultrasonic vibration, the carbonization process of the hardened body of cement mortar might be decelerated to some extent. Additionally, changes in internal composition and physical images of cement-based materials after absorption of CO2 were analyzed through microtest means like SEM and XRD. A carbonation resistance model was constructed, thus enabling disclosure of the variation mechanism of carbonation resistance of cement-based materials after absorption of CO2 under mechanical stirring and ultrasonic vibration. Results demonstrated that the higher CO2 absorption volume of fresh slurry generated more “nano-level” CaCO3 crystal nucleus. Accordingly, it could improve the porous structure of the cement mortar, decrease the quantity of capillary tubes significantly, improve the compaction degree of cement-based materials effectively, and lower the diffusion rate of CO2 in the cement paste base, thus improving the carbonation resistance. Research conclusions have important significance to decrease CO2 emissions and improve carbonation resistance of concrete.

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Arjaliès, Diane Laure, Cécile Goubet e Jean-Pierre Ponssard. "Approches stratégiques des émissions CO2. Les cas de l’industrie cimentière et de l’industrie chimique". Revue française de gestion 37, n. 215 (28 luglio 2011): 123–46. http://dx.doi.org/10.3166/rfg.215.123-146.

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37

Chen, Luke, Chii-Dong Ho, Li-Yang Jen, Jun-Wei Lim e Yu-Han Chen. "Augmenting CO2 Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers". Membranes 10, n. 11 (22 ottobre 2020): 302. http://dx.doi.org/10.3390/membranes10110302.

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Abstract (sommario):

We investigated the insertion of eddy promoters into a parallel-plate gas–liquid polytetrafluoroethylene (PTFE) membrane contactor to effectively enhance carbon dioxide absorption through aqueous amine solutions (monoethanolamide—MEA). In this study, a theoretical model was established and experimental work was performed to predict and to compare carbon dioxide absorption efficiency under concurrent- and countercurrent-flow operations for various MEA feed flow rates, inlet CO2 concentrations, and channel design conditions. A Sherwood number’s correlated expression was formulated, incorporating experimental data to estimate the mass transfer coefficient of the CO2 absorption in MEA flowing through a PTFE membrane. Theoretical predictions were calculated and validated through experimental data for the augmented CO2 absorption efficiency by inserting carbon-fiber spacers as an eddy promoter to reduce the concentration polarization effect. The study determined that a higher MEA feed rate, a lower feed CO2 concentration, and wider carbon-fiber spacers resulted in a higher CO2 absorption rate for concurrent- and countercurrent-flow operations. A maximum of 80% CO2 absorption efficiency enhancement was found in the device by inserting carbon-fiber spacers, as compared to that in the empty channel device. The overall CO2 absorption rate was higher for countercurrent operation than that for concurrent operation. We evaluated the effectiveness of power utilization in augmenting the CO2 absorption rate by inserting carbon-fiber spacers in the MEA feed channel and concluded that the higher the flow rate, the lower the power utilization’s effectiveness. Therefore, to increase the CO2 absorption flux, widening carbon-fiber spacers was determined to be more effective than increasing the MEA feed flow rate.

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38

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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Abstract (sommario):

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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Wang, Zhongcheng, Xiaoyu Liu e Ke Li. "Study of Absorbing CO2 from Emissions Using a Spray Tower". Atmosphere 13, n. 8 (18 agosto 2022): 1315. http://dx.doi.org/10.3390/atmos13081315.

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In order to reduce the environmental impact caused by CO2 emissions from ships and achieve the goal of green shipping, a spray tower using NaOH solution for the absorption of CO2 has been established in this paper. Using the characteristics of a 6135G128ZCa marine diesel engine, the CO2 absorption system was designed and mathematical models of CO2 absorption efficiency were developed. The effects of the variation in engine exhaust gas temperature, the concentration of NaOH solution, the exhaust gas velocity, different load conditions, and different nozzle types on the absorption efficiency of CO2 were thoroughly investigated experimentally. Moreover, the mechanism of CO2 absorption was analyzed. The developed model was verified by comparing the test results with the simulation results. The results of the study proved that using NaOH solution to absorb CO2 from ship exhausts could reduce the level of CO2 emissions from ships by more than 20%, which indicates that this technology could be used in the future to reduce the level of CO2 emissions from ships.

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40

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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Abstract (sommario):

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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41

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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Abstract (sommario):

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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42

Ho, Chii-Dong, Jui-Wei Ke e Jun Wei Lim. "Effects of Varying Spiral-Ring Pitches on CO2 Absorption by Amine Solution in Concentric Circular Membrane Contactors". Membranes 14, n. 7 (27 giugno 2024): 147. http://dx.doi.org/10.3390/membranes14070147.

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Abstract (sommario):

The CO2 absorption flux while using monoethanolamide (MEA) solution in a spiral-wired channel was significantly enhanced by optimizing both the descending and ascending spiral ring pitch configurations within the filled channel. In this study, two distinct spiral ring pitch configurations were integrated into concentric circular membrane contactors to augment CO2 absorption flux. Spiral rods were strategically inserted to mitigate concentration polarization effects, thereby reducing mass transfer boundary layers and increasing turbulence intensity. A theoretical one-dimensional model was developed to predict absorption flux and concentration distributions across varying MEA absorbent flow rates, CO2 feed flow rates, and inlet CO2 concentrations in the gas feed. Theoretical predictions of absorption flux improvement were validated against experimental results, demonstrating favorable agreement for both ascending and descending spiral ring pitch operations. Interestingly, the results indicated that descending spiral ring pitch operations achieved higher turbulent intensity compared to ascending configurations, thereby alleviating concentration polarization resistance and enhancing CO2 absorption flux with reduced polarization effects. Specifically, under conditions of a 40% inlet CO2 concentration and 5 cm3/s MEA feed flow rate, a notable 83.69% enhancement in absorption flux was achieved compared to using an empty channel configuration. Moreover, a generalized expression for the Sherwood number was derived to predict the mass transfer coefficient for CO2 absorption in concentric circular membrane contactors, providing a practical tool for performance estimation. The economic feasibility of the spiral-wired module was also assessed by evaluating both absorption flux improvement and incremental power consumption. Overall, these findings underscore the effectiveness of optimizing spiral ring pitch configurations in enhancing CO2 absorption flux, offering insights into improving the efficiency and economic viability of CO2 capture technologies.

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43

Li, Liang, Haidi Yu e Yuqi Chen. "Sol–Gel Synthesis of LiTiO2 and LiBO2 and Their CO2 Capture Properties". Atmosphere 13, n. 12 (24 novembre 2022): 1959. http://dx.doi.org/10.3390/atmos13121959.

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Abstract (sommario):

LiTiO2 was prepared from tetraethoxy titanium and lithium ethoxide by a sol–gel process and then treated at 773 K and 973 K under oxygen atmosphere, respectively. Compared with LiTiO2 prepared at 973 K, LiTiO2 prepared at 773 K has better CO2 capture properties. XRD patterns of synthetic LiTiO2 before and after CO2 capture confirm that the intermediate product, LixTizO2, is produced during CO2 capture. CO2 absorption degree of LiTiO2 was determined to be 37% (293 K), 40.8% (333 K), 45.5% (373 K), and 50.1% (393 K) for 11.75 h, respectively. Repetitive CO2 capture experiment indicates that LiTiO2 has excellent cyclic regeneration behavior. The CO2 absorption degree of LiTiO2 increased with increasing CO2 concentration. At a concentration of 0.05%, the absorption degree of LiTiO2 had a stable value of 1% even after an absorption time of 1.4 h. LiBO2 was fabricated by the similar sol–gel method and treated at 713 K. Mass percentage and specific surface area of synthesized LiBO2 increased with the increasing absorption temperature. Evidently, the diffusion of the CO2 molecule through the reaction product, which had a low activation energy of 15 kJ·mol−1 and apparent specific surface value of 55.63 m2/g, determined the efficiency of the absorption reaction. Compared with the other sol–gel synthesized lithium-based oxides, LiTiO2 possessed higher absorption capabilities and lower desorption temperature.

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44

Shan, Shao Yun, Qing Ming Jia, Li Hong Jiang e Ya Ming Wang. "Effect of Different Silicon Sources on CO₂ Absorption Properties of Li₄SiO₄ at High Temperature". Advanced Materials Research 213 (febbraio 2011): 515–18. http://dx.doi.org/10.4028/www.scientific.net/amr.213.515.

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Abstract (sommario):

Using cheap and porous diatomite or zeolite as silicon sources, we prepared firstly Li4SiO4 matetials for high temperature CO2 capture through solid-state method, and mainly investigated effects of silicon sources on the CO2 absorption properties of Li4SiO4 materials. Phase composition was analyzed by X-ray diffraction, and the CO2 absorption properties were studied by the simultaneous thermal thermogravimetric analyzer (TG-DSC). The results showed that Li4SiO4 materials using zeolite as silicon source showed little CO2 absorption properties, while Li4SiO4 materials using diatomite as silicon source showed excellent CO2 absorption properties. Compared with the existing literatures, the preparation cost of Li4SiO4 materials was lowered

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Kassim, Mohd Azlan, Nor Afifah Sulaiman, Rozita Yusoff e Mohamed Kheireddine Aroua. "Non-Aqueous Solvent Mixtures for CO2 Capture: Choline Hydroxide-Based Deep Eutectic Solvents Absorbent Performance at Various Temperatures and Pressures". Sustainability 15, n. 12 (7 giugno 2023): 9191. http://dx.doi.org/10.3390/su15129191.

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Abstract (sommario):

Carbon dioxide (CO2) absorption in a non-aqueous solution is a potential technology for reducing greenhouse gas emissions. In this study, a non-aqueous solvent, sulfolane and dimethylsulfoxide (DMSO), was functionalized with a deep eutectic solvent (DES) consisting of choline hydroxide and polyamines diethylenetriamine (DETA) and triethylenetetramine (TETA). The non-aqueous absorbents’ CO2 absorption ability was investigated in a high-pressure absorption reactor with a variable absorption temperature (303.15–333.15 K) and pressure (350–1400 kPa). The results showed that 2M ChOH:TETA−DMSO solution had the highest CO2 loading capacity when compared with other screened solutions, such as 2M ChOH:TETA−Sulfolane, 2M ChOH:DETA−DMSO and 2M ChOH:DETA−Sulfolane. It was also found that the absorption capacity increased with increasing pressure and decreased with temperature. The highest CO2 absorption by 2M ChOH:TETA−DMSO was observed at a partial pressure of 1400 kPa at 303.15 K 1.2507 mol CO2/mol DES. The use of a non-aqueous solvent in the mixture showed a phase separation phenomenon after the CO2 absorption reaction due to the formation of insoluble carbamate salt, which was identified through FTIR analysis. These findings suggest that the use of a DES polyamine mixed with a non-aqueous solvent could be a promising solution for CO2 capture.

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46

Yao, Jiafeng, Minghao Yu, Tong Zhao, Akimaro Kawahara e Michio Sadatomi. "INVESTIGATION OF CO2 ABSORPTION PERFORMANCE IN A GAS-LIQUID TWO-PHASE FLOW ATOMIZER ON THE BASIS OF A GAS DIFFUSION MODEL". Transactions of the Canadian Society for Mechanical Engineering 41, n. 4 (novembre 2017): 645–56. http://dx.doi.org/10.1139/tcsme-2017-1045.

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Experimental and analytical studies of CO2 absorption performance are carried out in a gas-liquid two-phase flow atomizer on the basis of a gas diffusion model. The gas-liquid two-phase flow atomizer with high spray efficiency and low power consumption has been applied to CO2 absorption. Experiments for the CO2 absorption were conducted in an isolated room and the results showed that, the mist sprayed by the improved atomizer can effectively reduce the CO2 concentration. Furthermore, a CO2 diffusion model was developed to predict the absorption process. This model was validated through a comparison between calculation and experiment. Comparison results showed that the proposed model could predict the time-variations of CO2 concentration well in the test room.

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Zhang, Xingtian, Jun Wu, Xiaoxiao Lu, Yefeng Yang, Li Gu e Xuebo Cao. "Aqueous 2-Ethyl-4-methylimidazole Solution for Efficient CO2 Separation and Purification". Separations 10, n. 4 (3 aprile 2023): 236. http://dx.doi.org/10.3390/separations10040236.

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Abstract (sommario):

Carbon capture and storage (CCS) technology is considered as one of the most effective short-term solutions in reducing atmospheric CO2 concentrations. A key of CCS technology is to seek the absorbent with low cost, fast absorption rate, and high stability. In this study, we show that 2-ethyl-4-methylimidazole is particularly suitable for efficient CO2 capture. The aqueous solution of 2-ethyl-4-methylimidazole displays a maximum CO2 molar absorption capacity of 1.0 mol∙mol−1 and the absorbed CO2 can be completely released through heating the solution at a relatively low temperature (<100 °C). Stability tests show that the aqueous system is quite stable, with less than 10% loss of the molar absorption capacity after eight absorption–desorption cycles. Time-related in-situ attenuated total reflection infrared absorption spectroscopy and 13C nuclear magnetic resonance spectroscopy studies reveal that the intermediates are HCO3− and H2CO3 in the process of CO2 absorption–desorption. These intermediates are easily decomposed, which are responsible for the low CO2 desorption temperature and high desorption efficiency of the system. Moreover, the aqueous solution of 2-ethyl-4-methylimidazole is able to separate and purify CO2 from flue gas and even ambient air. Consequently, 2-ethyl-4-methylimidazole is a promising low-cost CO2 absorbent for industrial implementation.

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48

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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Yan, Xianyao, Yingjie Li, Xiaotong Ma, Jianli Zhao e Zeyan Wang. "Performance of Li4SiO4 Material for CO2 Capture: A Review". International Journal of Molecular Sciences 20, n. 4 (20 febbraio 2019): 928. http://dx.doi.org/10.3390/ijms20040928.

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Abstract (sommario):

Lithium silicate (Li4SiO4) material can be applied for CO2 capture in energy production processes, such as hydrogen plants, based on sorption-enhanced reforming and fossil fuel-fired power plants, which has attracted research interests of many researchers. However, CO2 absorption performance of Li4SiO4 material prepared by the traditional solid-state reaction method is unsatisfactory during the absorption/regeneration cycles. Improving CO2 absorption capacity and cyclic stability of Li4SiO4 material is a research highlight during the energy production processes. The state-of-the-art kinetic and quantum mechanical studies on the preparation and CO2 absorption process of Li4SiO4 material are summarized, and the recent studies on the effects of preparation methods, dopants, and operating conditions on CO2 absorption performance of Li4SiO4 material are reviewed. Additionally, potential research thoughts and trends are also suggested.

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Kassim, Mohd Azlan, Zhongyi Ho, Farihahusnah Hussin e Mohamed Kheireddine Aroua. "Exploring Non-aqueous Solutions for CO₂ Capture at Elevated Pressure: An Initial Study for EHA/MOR in DMSO Mixtures". E3S Web of Conferences 488 (2024): 03024. http://dx.doi.org/10.1051/e3sconf/202448803024.

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Abstract (sommario):

Carbon dioxide (CO2) absorption in a non-aqueous solution is a potential technology for reducing greenhouse gas emissions. In this study, a non-aqueous solvent, dimethylsulfoxide (DMSO), was blended with a amines The non-aqueous blended amines absorbents’ CO2 absorption ability was investigated in a high-pressure absorption reactor with a variable absorption pressure (350–1400 kPa) at constant temperature (303.15K). The results showed that 2M EHA in DMSO solution had the highest CO2 loading capacity (molCO2/molamine) when compared with 1M EHA + 1M MOR in DMSO solutions. It was also found that the absorption capacity increased with increasing pressure. The highest CO2 absorption by 2M EHA in DMSO solution was observed at a pressure of 1400 kPa at 303.15 K with 1.2507 molCO2/molamine. The use of non-aqueous blended amine solvents showed no phase separation phenomenon after the CO2 absorption reaction and the formation of carbamate salt was identified through FTIR analysis. 1 M EHA 1M MOR in DMSO has shown a higher initial absorption rate in comparison to 2 M EHA in DMSO which would suggest that the use of a 1M EHA + 1M MOR in DMSO as a non-aqueous solvent could be a promising solution for CO2 capture.

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