Статті в журналах: "Absorption du CO2"

1

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, no. 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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2

YANASE, Ikuo, Hirofumi OTSUKA та Hidehiko KOBAYASHI. "CO2 absorption of CeO2-coated α-LiFeO2". Journal of the Ceramic Society of Japan 119, № 1396 (2011): 933–38. http://dx.doi.org/10.2109/jcersj2.119.933.

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3

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

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4

Christiani, Natalia, Yayat Hidayat, and Sutrisno Trisno. "CO2 Emission and Absorption Estimation in Bandung City by Implementing CO2 Emission Rate Reduction Simulation Using the Stella Program." 3BIO: Journal of Biological Science, Technology and Management 3, no. 1 (July 13, 2021): 28–41. http://dx.doi.org/10.5614/3bio.2021.3.1.4.

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Bandung CO2 emissions continue to increase in line with its population. The emissions source comes from the industrial, transportation, Liquefied Petroleum Gas (LPG), household, and livestock sectors, whereas CO2 absorption only comes from vegetation through photosynthesis. High CO2 emissions could decrease air quality and reduce environmental health. This study aims to estimate the amount of CO2 emissions and their absorption in Bandung by implementing CO2 Emission Rate Reduction Simulation (CERRS). The simulation comprises four scenarios, namely substitution of vehicle fuel and the application of smart driving techniques, optimization of waste processing in IWPS, processing 90% of livestock waste into biogas, and green space development of 30% of Bandung City area. Estimated CO2 emission and absorption rates were calculated for the next 10 years (2021-2030) using the Stella program version 9.0.2. The results showed that without implementing the CERRS, the amount of CO2 emissions in Bandung in 2030 was estimated to reach 10,983,666.82 tons while implementing the CERRS was 2,361,721.30 tons. Without implementing the CERRS, the estimated amount of CO2 absorptions in 2030 was 214,235.11 tons, while implementing the CERRS was 2,785,703.11 tons. It is expected that the application of the CERRS could reduce the level of CO2 emissions in Bandung by 78.5% and increase CO2 absorptions by 1,200.3%.

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5

Lívanský, Karel, and Jiří Doucha. "Additional CO2 saturation of thin-layer outdoor micro algal cultures : CO2 mass transfer and absorption efficiency." Algological Studies/Archiv für Hydrobiologie, Supplement Volumes 87 (December 2, 1997): 145–54. http://dx.doi.org/10.1127/algol_stud/87/1997/145.

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6

Nagano, Yatsuhisa, Tetsu Kiyobayashi, and Tomoshige Nitta. "CO2 absorption in C60 solid." Chemical Physics Letters 217, no. 3 (January 1994): 186–90. http://dx.doi.org/10.1016/0009-2614(94)80005-7.

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7

Villeret, Murielle. "Optical-absorption spectrum ofCdGa2Se4:Co2+." Physical Review B 39, no. 14 (May 15, 1989): 10236–38. http://dx.doi.org/10.1103/physrevb.39.10236.

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8

Kim, Hyung-Gon, and Wha-Tek Kim. "Optical absorption ofZnGa2S4andZnGa2S4:Co2+crystals." Physical Review B 41, no. 12 (April 15, 1990): 8541–44. http://dx.doi.org/10.1103/physrevb.41.8541.

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9

Liu, Lili, Yongsheng Ji, Zhanguo Ma, Furong Gao, and Zhishan Xu. "Study on the Effects of Ultrasonic Agitation on CO2 Adsorption Efficiency Improvement of Cement Paste." Applied Sciences 11, no. 15 (July 26, 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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10

Jin, Mei, Li Yan Zhou, Ping Lu, Jin Huang Wang, and Guo Xian Yu. "Performance of MDEA-PZ-TETA for Absorption and Desorption of CO₂." Advanced Materials Research 864-867 (December 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

Tagwale, Pranav, Vibhas Bambroo, Rituja Bande, Prasad Rathod, and S. T. Mali. "POTENTIAL OF CARBON DIOXIDE ABSORPTION IN CONCRETE." International Journal of Students' Research in Technology & Management 3, no. 5 (September 27, 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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12

Charney, A. N., and R. W. Egnor. "Membrane site of action of CO2 on colonic sodium absorption." American Journal of Physiology-Cell Physiology 256, no. 3 (March 1, 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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13

Li, Fang Qin, Ji Yong Liu, Xiao Feng Zhang, Jian Xing Ren, and Jiang Wu. "The Effects of Operation Parameters on CO₂ Removal Efficiency by Membrane Method." Advanced Materials Research 955-959 (June 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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14

Chavan, Sayali Ramdas, Patrick Perré, Victor Pozzobon, and Julien Lemaire. "CO2 Absorption Using Hollow Fiber Membrane Contactors: Introducing pH Swing Absorption (pHSA) to Overcome Purity Limitation." Membranes 11, no. 7 (June 30, 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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15

SELVI, P. P., R. BASKAR, and PRAVEEN S. NAIR. "ACID GAS ABSORPTION STUDIES IN PACKED COLUMN." JOURNAL OF ADVANCES IN CHEMISTRY 13, no. 10 (February 22, 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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16

Muhd Nor, Nik Hisyamudin, Seiji Yokoyama, and Minoru Umemoto. "Storage of CO₂ in Low Al₂O₃ EAF Oxidizing Slag by Grinding with Vibration Mill." Materials Science Forum 654-656 (June 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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17

Zhang, Wei Feng, and Jian Hui Shu. "Experimental Study of CO₂ Sequestration Using Glycinate-TEA." Applied Mechanics and Materials 522-524 (February 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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18

Aguilar, Manuel Jiménez. "Organic Wastes to Increase CO2 Absorption." International Journal of Clean Coal and Energy 03, no. 04 (2014): 47–53. http://dx.doi.org/10.4236/ijcce.2014.34005.

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19

Benhamou, D., and L. Beydon. "Absorption du CO2 : principes et utilisation." Annales Françaises d'Anesthésie et de Réanimation 6, no. 5 (January 1987): 375–77. http://dx.doi.org/10.1016/s0750-7658(87)80357-x.

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20

Kim, Wha-Tek, Chang-Sub Chung, Yong-Geun Kim, Moon-Seog Jin, and Hyung-Gon Kim. "Optical absorption ofZnGa2Se4:Co2+single crystals." Physical Review B 38, no. 3 (July 15, 1988): 2166–68. http://dx.doi.org/10.1103/physrevb.38.2166.

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21

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

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22

Kornev, I., J. P. Rivera, S. Gentil, A. G. M. Jansen, M. Bichurin, H. Schmid, and P. Wyder. "Optical absorption of Co2+ in LiCoPO4." Physica B: Condensed Matter 270, no. 1-2 (October 1999): 82–87. http://dx.doi.org/10.1016/s0921-4526(99)00158-1.

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23

Epp, B., H. Fahlenkamp, and C. Stankewitz. "CO2-Absorption mit Aminlösung per Membrankontaktor." Chemie Ingenieur Technik 80, no. 10 (October 2008): 1579–82. http://dx.doi.org/10.1002/cite.200800061.

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24

Yu, Hai, Qunyang Xiang, Mengxiang Fang, Qi Yang, and Paul Feron. "Promoted CO2 absorption in aqueous ammonia." Greenhouse Gases: Science and Technology 2, no. 3 (April 23, 2012): 200–208. http://dx.doi.org/10.1002/ghg.1280.

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25

Freeman, Brice, Pingjiao Hao, Richard Baker, Jay Kniep, Eric Chen, Junyuan Ding, Yue Zhang, and 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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26

Ahmad, A. L., A. R. Sunarti, K. T. Lee, and W. J. N. Fernando. "CO2 removal using membrane gas absorption." International Journal of Greenhouse Gas Control 4, no. 3 (May 2010): 495–98. http://dx.doi.org/10.1016/j.ijggc.2009.12.003.

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27

Trokhimovskiy, A., V. Perevalov, O. Korablev, A. F. Fedorova, K. S. Olsen, J. L. Bertaux, A. Patrakeev та ін. "First observation of the magnetic dipole CO2 absorption band at 3.3 μm in the atmosphere of Mars by the ExoMars Trace Gas Orbiter ACS instrument". Astronomy & Astrophysics 639 (липень 2020): A142. http://dx.doi.org/10.1051/0004-6361/202038134.

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The atmosphere of Mars is dominated by CO2, making it a natural laboratory for studying CO2 spectroscopy. The Atmospheric Chemistry Suite (ACS) on board the ExoMars Trace Gas Orbiter uses solar occultation geometry to search for minor atmospheric species. During the first year of ACS observations, the attention was focused on the spectral range covering the methane ν3 absorption band, 2900–3300 cm−1, which has previously been observed on Mars. No methane was detected by ACS; instead, an improvement of the data processing has led to the identification of 30 weak absorption lines that were missing from spectroscopic databases. Periodic series of absorptions up to ~1.6% deep are observed systematically around the position of the methane Q-branch when the line of sight penetrates below 20 km (creating an optical path length of 300–400 km, with an effective pressure of a few millibar). The observed frequencies of the discovered lines match theoretically computed positions of the P-, Q-, and R-branches of the magnetic dipole and electric quadrupole 01111-00001 (ν2 + ν3) absorption bands of the main CO2 isotopologue; neither band has been measured or computed before. The relative depths of the observed spectral features support the magnetic dipole origin of the band. The contribution of the electric quadrupole absorption is several times smaller. Here we report the first observational evidence of a magnetic dipole CO2 absorption.

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28

Sylvia, Novi, Anisa Anisa, and Lukman Hakim. "Simulasi Aliran Kolom Absorpsi untuk Proses Penyerapan CO2 dengan Absorben Air menggunakan Computational Fluid Dynamics (CFD)." Jurnal Teknologi Kimia Unimal 7, no. 1 (January 29, 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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29

Liu, Xiangwei, Qian Ao, Shengyou Shi, and Shuie Li. "CO₂ capture by alcohol ammonia based deep eutectic solvents with different water content." Materials Research Express 9, no. 1 (January 1, 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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30

Miah, MD S., Mohammad S. Hossain, Abid A. Khan, Muhammad A. Ashraf, and Zoubir Zouaoui. "CO2 Absorption and Mass Transfer in Film Flow on a Rotating Disc." International Journal of Chemical Engineering and Applications 11, no. 1 (February 2020): 18–22. http://dx.doi.org/10.18178/ijcea.2020.11.1.773.

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31

Sun, Zhi Guo, Hong Yong Xie, and Zhong Ping Xu. "CO₂ Sequestration in Mixtures of Sodium Humate and Waste Gypsum." Applied Mechanics and Materials 448-453 (October 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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32

Chen, Luke, Chii-Dong Ho, Li-Yang Jen, Jun-Wei Lim, and Yu-Han Chen. "Augmenting CO2 Absorption Flux through a Gas–Liquid Membrane Module by Inserting Carbon-Fiber Spacers." Membranes 10, no. 11 (October 22, 2020): 302. http://dx.doi.org/10.3390/membranes10110302.

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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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33

Crofts, J. N., and G. J. Barritt. "The liver cell plasma membrane Ca2+ inflow systems exhibit a broad specificity for divalent metal ions." Biochemical Journal 269, no. 3 (August 1, 1990): 579–87. http://dx.doi.org/10.1042/bj2690579.

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1. The inflow of Mn2+ across the plasma membranes of isolated hepatocytes was monitored by measuring the quenching of the fluorescence of intracellular quin2, by atomic absorption spectroscopy and by the uptake of 54Mn2+. The inflow of other divalent metal ions was measured using quin2. 2. Under ionic conditions which resembled those present in the cytoplasmic space, Mn2+, Zn2+, Co2+, Ni2+ and Cd2+ each quenched the fluorescence of a solution of Ca2(+)-quin2. 3. The addition of Mn2+, Zn2+, Co2+, Ni2+ or Cd2+ to cells loaded with quin2 caused a time-dependent decrease in the fluorescence of intracellular quin2. Plots of the rate of decrease in fluorescence as a function of the concentration of Mn2+ reached a plateau at 100 microM-Mn2+. 4. The rate of decrease in fluorescence induced by Mn2+ was stimulated by 20% in the presence of vasopressin. The effect of vasopressin was completely inhibited by 200 microM-verapamil. Adrenaline, angiotensin II and glucagon also stimulated the rate of decrease in the fluorescence of intracellular quin2 induced by Mn2+. 5. The rate of decrease in fluorescence induced by Zn2+, Co2+, Ni2+ or Cd2+ was stimulated by between 20 and 190% in the presence of vasopressin or angiotensin II. 6. The rates of uptake of Mn2+ measured by atomic absorption spectroscopy or by using 54Mn2+ were inhibited by about 20% by 1.3 mM-Ca2+o and stimulated by 30% by vasopressin. 7. Plots of Mn2+ uptake, measured by atomic absorption spectroscopy or with 54Mn2+, as a function of the extracellular concentration of Mn2+ were biphasic over the range 0.05-1.0 mM added Mn2+ and did not reach a plateau at 1.0 mM-Mn2+. 8. It is concluded that (i) hepatocytes possess both a basal and a receptor-activated divalent cation inflow system, each of which has a broad specificity for metal ions, and (ii) the receptor-activated divalent cation inflow system is the receptor-operated Ca2+ channel.

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34

Wang, Zhongcheng, Xiaoyu Liu, and Ke Li. "Study of Absorbing CO2 from Emissions Using a Spray Tower." Atmosphere 13, no. 8 (August 18, 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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35

Wu, Guoqing, Ying Liu, Guangliang Liu, and Xiaoying Pang. "The CO2 Absorption in Flue Gas Using Mixed Ionic Liquids." Molecules 25, no. 5 (February 25, 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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36

Ho, Chii-Dong, Hsuan Chang, Jr-Wei Tu, Jun-Wei Lim, Chung-Pao Chiou, and Yu-Jie Chen. "Theoretical and Experimental Studies of CO2 Absorption in Double-Unit Flat-Plate Membrane Contactors." Membranes 12, no. 4 (March 29, 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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37

Li, Ran, Congyi Wu, and Dezhong Yang. "CO2 Absorption Mechanism by the Nonaqueous Solvent Consisting of Hindered Amine 2-[(1,1-dimethylethyl)amino]ethanol and Ethylene Glycol." Molecules 25, no. 23 (December 5, 2020): 5743. http://dx.doi.org/10.3390/molecules25235743.

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In this work, we studied the CO2 absorption mechanism by nonaqueous solvent comprising hindered amine 2-[(1,1-dimethylethyl)amino]ethanol (TBAE) and ethylene glycol (EG). The NMR and FTIR results indicated that CO2 reacted with an -OH group of EG rather than the -OH of TBAE by producing hydroxyethyl carbonate species. A possible reaction pathway was suggested, which involves two steps. In the first step, the acid–base reaction between TBAE and EG generated the anion HO-CH2-CH2-O-; in the second step, the O− of HO-CH2-CH2-O− attacked the C atom of CO2, forming carbonate species.

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38

Selvi, Pongayi, and Rajoo Baskar. "CO2 absorption in nanofluid with magnetic field." Chemical Industry and Chemical Engineering Quarterly, no. 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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39

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

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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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40

Yao, Jiafeng, Minghao Yu, Tong Zhao, Akimaro Kawahara, and 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, no. 4 (November 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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41

Cheng, Jinyu, Congyi Wu, Weiji Gao, Haoyuan Li, Yanlong Ma, Shiyu Liu, and Dezhong Yang. "CO2 Absorption Mechanism by the Deep Eutectic Solvents Formed by Monoethanolamine-Based Protic Ionic Liquid and Ethylene Glycol." International Journal of Molecular Sciences 23, no. 3 (February 8, 2022): 1893. http://dx.doi.org/10.3390/ijms23031893.

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Deep eutectic solvents (DESs) have been widely used to capture CO2 in recent years. Understanding CO2 mechanisms by DESs is crucial to the design of efficient DESs for carbon capture. In this work, we studied the CO2 absorption mechanism by DESs based on ethylene glycol (EG) and protic ionic liquid ([MEAH][Im]), formed by monoethanolamine (MEA) with imidazole (Im). The interactions between CO2 and DESs [MEAH][Im]-EG (1:3) are investigated thoroughly by applying 1H and 13 C nuclear magnetic resonance (NMR), 2-D NMR, and Fourier-transform infrared (FTIR) techniques. Surprisingly, the results indicate that CO2 not only binds to the amine group of MEA but also reacts with the deprotonated EG, yielding carbamate and carbonate species, respectively. The reaction mechanism between CO2 and DESs is proposed, which includes two pathways. One pathway is the deprotonation of the [MEAH]+ cation by the [Im]− anion, resulting in the formation of neutral molecule MEA, which then reacts with CO2 to form a carbamate species. In the other pathway, EG is deprotonated by the [Im]−, and then the deprotonated EG, HO-CH2-CH2-O−, binds with CO2 to form a carbonate species. The absorption mechanism found by this work is different from those of other DESs formed by protic ionic liquids and EG, and we believe the new insights into the interactions between CO2 and DESs will be beneficial to the design and applications of DESs for carbon capture in the future.

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42

Yan, Xianyao, Yingjie Li, Xiaotong Ma, Jianli Zhao, and Zeyan Wang. "Performance of Li4SiO4 Material for CO2 Capture: A Review." International Journal of Molecular Sciences 20, no. 4 (February 20, 2019): 928. http://dx.doi.org/10.3390/ijms20040928.

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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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43

Jamaludin, Siti Nabihah, and Ruzitah Mohd Salleh. "Research Trends of Carbon Dioxide Capture using Ionic Liquids and Aqueous Amine-Ionic Liquids Mixtures." Scientific Research Journal 13, no. 1 (June 30, 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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44

Jamaludin, Siti Nabihah, and Ruzitah Mohd Salleh. "Research Trends of Carbon Dioxide Capture using Ionic Liquids and Aqueous Amine-Ionic Liquids Mixtures." Scientific Research Journal 13, no. 1 (June 1, 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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45

Jiménez Aguilar, Manuel. "Wastes to Reduce Emissions from Automotive Diesel Engines." Journal of Waste Management 2014 (February 10, 2014): 1–5. http://dx.doi.org/10.1155/2014/807947.

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The objective of the study was actually the investigation of the effect of various treatments on the ability of urine in absorbing greenhouse gases. Urine alone or mixed with olive-oil-mill waste waters (O), poultry litter (P), or sewage sludge (S) was used on the absorption of CO2 and NOx from diesel exhaust. The absorption coefficient (0.98–0.29 g CO2/grNH4) was similar to other solvents such as ammonia and amines. The ranges of CO2 absorption(1.7–5.6) g/l and NO reduction (0.9–3.7) g/l in six hours indicate that on average 20 litres of urine could be needed to capture CO2 and NOx vehicle emissions from each covered kilometre. The best results of CO2 absorption and NOx reduction were for urine mixed with O, P and urine alone. These wastes could be used to capture CO2 and NOx from automotive diesel engines to reduce gas emissions. The proposed strategy requires further research to increase CO2 absorption and reduce the risks associated with waste-water reuse.

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46

Wilk, Andrzej, Lucyna Więcław-Solny, Dariusz Śpiewak, Tomasz Spietz, and Hanna Kierzkowska-Pawlak. "A Selection of Amine Sorbents for CO2 Capture from Flue Gases." Chemical and Process Engineering 36, no. 1 (March 1, 2015): 49–57. http://dx.doi.org/10.1515/cpe-2015-0004.

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Abstract Amine absorption processes are widely used in the industry to purify refinery gases, process gases or natural gas. Recently, amine absorption has also been considered for CO2 removal from flue gases. It has a number of advantages, but there is one major disadvantage - high energy consumption. This can be reduced by using an appropriate sorbent. From a group of several dozen solutions, three amine sorbents were selected based on primary, tertiary and sterically hindered amines. The solutions were used to test CO2 absorption capacity, absorption kinetics and heat of CO2 absorption. Additional tests were performed on the actual absorber-desorber system to indicate the most appropriate sorbent for capturing CO2 from flue gases.

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47

Mustafa, Nur Farhana Ajua, Azmi Mohd Shariff, WeeHorng Tay, and Siti Munirah Mhd Yusof. "Effect of Carbon Dioxide (CO2) concentration in the gas feed on Carbon Dioxide Absorption Performance using Aqueous Potassium Carbonate promoted with Glycine." E3S Web of Conferences 287 (2021): 02007. http://dx.doi.org/10.1051/e3sconf/202128702007.

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This paper presented the effect of CO2 concentration in the gas feed to the CO2 absorption performance using a green solvent, potassium carbonate promoted with glycine (PCGLY). Recently, the performance of this solvent (with precipitates) was hindered by its poor mass transfer performance due to the blockage in packings and piping. Therefore, this study focused to study the CO2 absorption performance of non-precipitating potassium carbonate promoted with glycine. This green solvent contains aqueous blend of 15wt% potassium carbonate and 3 wt% glycine. The absorption performance of the solvent was obtained by demonstrated a few experimental works using a bench scale packed absorption column. The packing type was Sulzer metal gauze and the column consisted of six sampling point which located equidistance along the packing.The effect of CO2 concentration at the gas feed was assessed in term of its CO2 removal efficiency and concentration profile along the packing. The study shows the decreasing trend of CO2 removal as CO2 inlet concentration in the gas feed increases. The reason of this behavior is due to the limited reactant of liquid phase to absorb high CO2 concentration in gas phase. The main outcome of this study demonstrated the efficient absorption which can absorb up to 79.24 % of CO2 from natural gas using non-precipitated PCGLY.

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48

Kim, Hyung-Sub, Florent Noulèkoun, Nam-Jin Noh, and Yo-Whan Son. "Future Projection of CO2 Absorption and N2O Emissions of the South Korean Forests under Climate Change Scenarios: Toward Net-Zero CO2 Emissions by 2050 and Beyond." Forests 13, no. 7 (July 8, 2022): 1076. http://dx.doi.org/10.3390/f13071076.

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Forests mitigate climate change by absorbing CO2. However, N2O emissions in forests, which has 298 times larger global warming potential than CO2, can diminish the climate mitigation role of forests. Thus, it is crucial to project not only CO2 absorption but also N2O emissions in forests to provide a scientific basis for the 1.5 °C Paris Agreement goal. This study used a biogeochemical model, called FBD-CAN, to project CO2 absorption and N2O emissions of South Korean forests from 2021 to 2080 under three climate scenarios, including the current climate, Representative Concentration Pathway (RCP) 4.5, and RCP 8.5. From 2021 to 2080, CO2 absorption decreased from 5.0 to 1.4 Mg CO2 ha—1 year—1 under the current climate with the aging of forests, while N2O emissions increased from 0.25 to 0.33 Mg CO2 eq. ha—1 year—1. Climate change accelerated the decreasing trend in CO2 absorption and the increasing trend in N2O emissions. The subalpine region had a faster decreasing trend in CO2 absorption than the central and southern regions due to its older stand age. These findings provide scientific references for future greenhouse gas reduction plans and broaden our knowledge of the impacts of climate change on the climate mitigation role of forests.

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49

Ihsana, Yukh, Putu Adhi Rama, Sugeng Winardi, and Tantular Nurtono. "Bubble column application on purification of biogas and production of nano-calcium carbonate in continuous process." Malaysian Journal of Fundamental and Applied Sciences 16, no. 3 (June 15, 2020): 286–91. http://dx.doi.org/10.11113/mjfas.v16n3.1567.

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Purification of biogas by removing carbon dioxide content has been developed to increase its calorific value. The CO2 contained in biogas was absorbed by contacting Ca(OH)2 solution and CO2 in the bubble column to produce high purity of biogas and generated precipitated calcium carbonate (PCC) simultaneously. Two sources of CO2 were used in this work, which were CO2 contained in biogas and pure CO2. Pure CO2 was used as a benchmark in this study to show the effect of the presence of methane contained in biogas on the absorption process. The investigation was done in a continuous process. The results showed that the highest absorption of CO2 was obtained in biogas at 79.34 %. PCC with calcite phases was successfully formed in 225–270 nm. Rhombohedral calcite phase was formed by the use of pure CO2 and biogas as a source of CO2. The use of CO2 contained in biogas and pure CO2 in the absorption process did not have an effect on the crystalline phase and morphology of calcite formed. Several factors that significantly affected the absorption of CO2 were gas flow rate, absorbent flow rate, CO2 concentration in the gas inlet, and the initial liquid level in the bubble column.

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50

Gibert, Fabien, Fabien Marnas, Dimitri Edouart, and Pierre H. Flamant. "An a Posteriori Method Based on Photo-Acoustic Cell Information to Correct for Lidar Transmitter Spectral Shift: Application to Atmospheric CO2 Differential Absorption Lidar Measurements." Applied Spectroscopy 61, no. 10 (October 2007): 1068–75. http://dx.doi.org/10.1366/000370207782217798.

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An a posteriori corrective method based on photo-acoustic cell (PAC) information is proposed to correct for laser transmitter spectral shift during atmospheric CO2 measurements by 2 μm heterodyne differential absorption lidar (HDIAL) technique. The method for using the PAC signal to retrieve the actual atmospheric CO2 absorption is presented in detail. This issue is tackled using a weighting function. The performance of the proposed corrective method is discussed and the various sources of error associated with the PAC signal are investigated. For 300 shots averaged and a frequency shift (from the CO2 absorption line center) lower than the CO2 absorption line half-width, the relative error on HDIAL CO2 mixing ratio measurements is lower than 1.3%. The corrective method is validated in absolute value by comparison between HDIAL and in situ sensor measurements of CO2.

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