Article
Engineering, Environmental
Federico Atzori, Francesco Barzagli, Alberto Varone, Giacomo Cao, Alessandro Concas
Summary: It is well known that CO2 capture and re-use is one of the main challenges to tackle global warming. Aqueous ammonia solutions have shown promising potential as sorbents for CO2 capture, offering higher absorption capacity, lower energy requirements, and greater resistance to degradation compared to conventional alkanolamines. This study investigates the chemical absorption of CO2 in aqueous NH3 solutions and proposes a mathematical model to quantify the capture efficiency dynamics and sorbent composition. The results validate the model's effectiveness in designing and optimizing the capture process, considering the effects of temperature and sorbent concentration.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Energy & Fuels
Simion Dragan, Hannelore Lisei, Flavia-Maria Ilea, Alexandru-Constantin Bozonc, Ana-Maria Cormos
Summary: In this study, a comprehensive mathematical model is presented to address climate change through the process of carbon dioxide capture using ammonia aqueous solutions. The model is validated and shows strong correlation with experimental results. Scaling up the model to simulate industrial-scale ammonia-based absorption process reveals its potential utility for future applications, including process optimization and control techniques for mitigating drawbacks. The model's ability to effectively replicate system behavior under various conditions highlights its importance.
Article
Engineering, Environmental
Mahdi Abbasian, Hesam Najibi
Summary: This study investigates the use of aqueous solutions of amino acids for CO2 absorption. The kinetics of CO2 absorption in sodium serinate solutions and their blend with piperazine were studied. The results show that sodium serinate solution can be used as a CO2 absorbent, and adding piperazine to the solution can improve the CO2 absorption efficiency.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Environmental Sciences
Muthumari Perumal, Dhanalakshmi Jayaraman, Ambedkar Balraj
Summary: In this study, the post-combustion CO2 capture process using solvent-based chemical absorption with MEA and IL blends was investigated. By varying the compositions of MEA and [TBA][OH], it was found that the mixture of 20 wt% MEA + 10 wt% [TBA][OH] exhibited the highest absorption/desorption rate and regeneration efficiency. The regeneration energy for this mixture was calculated to be 28.6 kJ/mol of CO2, which is 32% less than that of the baseline 30 wt% MEA. Additionally, the physicochemical properties such as density, viscosity, and surface tension for all the solvent blends were experimentally studied.
Article
Engineering, Chemical
Cheng-Hsiu Yu, Yu-Jeng Lin, David Shan-Hill Wong, Chau-Chyun Chen
Summary: This study presents a first-principle process simulation model for the chemical absorption of CO2 with MEA aqueous solutions using RPB. The model accurately simulates the phase and chemical equilibria, the heat and mass transfer, the reactions between MEA and CO2, and the RPB hydraulics. The reaction rate constant is found to be the controlling step with the greatest potential to enhance CO2 absorption performance in RPB.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Environmental Sciences
Ali Asghar Nozaeim, Hamid Reza Mortaheb, Ahmad Tavasoli, Morteza Mafi
Summary: The rates of CO2 absorption into fresh and regenerated solutions of DEEA, MDEA, and their mixture with sulfolane were investigated. Sulfolane acts as an effective absorption activator in the hybrid DEEA solutions, but has a negative effect on the absorption rate in MDEA solutions. The absorption rates of regenerated DEEA solutions are lower than fresh solutions, while the values for hybrid DEEA solutions are higher. The CO2 absorption regime in the DEEA solutions was determined as a fast second-order reaction based on Hatta number and enhancement factor.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2022)
Article
Chemistry, Multidisciplinary
Shashi Kant Shukla, Yong-Lei Wang, Aatto Laaksonen, Xiaoyan Ji
Summary: A 30% (w/w) [ImCl][EDA]-based deep eutectic solvent (DES) in water has shown better CO2 uptake performance, desirable kinetics, lower regeneration enthalpy, and lesser degradation compared to the industrially popular 30% monoethanolamine (MEA) solution.
CHEMICAL COMMUNICATIONS
(2023)
Article
Engineering, Chemical
Antonio Conversano, Serena Delgado, Christophe Coquelet, Stefano Consonni, Manuele Gatti
Summary: This study develops a model for the solubility of CO2 in aqueous solutions of potassium lysinate using a Kent-Eisenberg-like approach. The model is calibrated with experimental data and incorporates Debye-Huckel activity coefficients. The developed Deshmukh-Mather model shows good predictive performance and is validated against additional experimental data.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Qinlan Luo, Rui Dong, Bohak Yoon, Hongxia Gao, Mengjie Chen, Gyeong S. Hwang, Zhiwu Liang
Summary: The reaction kinetics and molecular mechanisms of CO2 absorption using nonaqueous and aqueous MEA/MDEA/AMP solutions were analyzed. The study found that in nonaqueous solutions, only AMP/MDEA participated in the deprotonation of MEA-zwitterion, while in aqueous solutions, AMP could also react with CO2 through base-catalyzed hydration mechanism in addition to the zwitterion mechanism.
Article
Chemistry, Inorganic & Nuclear
Hamza Ighnih, Redouane Haounati, Hassan Ouachtak, Abdelmajid Regti, Brahim El Ibrahimi, Naima Hafid, Amane Jada, Mohamed Labd Taha, Abdelaziz Ait Addi
Summary: This study synthesized and characterized a novel magnetic kaolinite nanocomposite, CoFe2O4@Kaol, for efficient removal of methylene blue (MB) dye from aqueous solutions. The physicochemical properties of the nanocomposite were investigated, and its adsorption performance was systematically studied. The results showed that the CoFe2O4@Kaol nanocomposite exhibited high adsorption capacity and superior affinity for MB adsorption compared to unmodified kaolinite adsorbent. The study also elucidated the synergistic effects of hydrophilic interactions and hydrogen bonding in the MB-CoFe2O4@Kaol interface.
INORGANIC CHEMISTRY COMMUNICATIONS
(2023)
Article
Engineering, Environmental
Karen Gonzalez, Louis Boyer, David Almoucachar, Benedicte Poulain, Eric Cloarec, Christophe Magnon, Frederick de Meyer
Summary: This study investigates the process model for CO2 and H2S absorption using an aqueous mixture of N-methyl diethanolamine (MDEA) - ethylene glycol (EG). The addition of EG reduces the solubility of acid gases, while the impact on absorption rate is minor. Adding EG can reduce reboiler duty but requires increased solvent flow rate.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Weifeng Zhang, Zhaoxiong Deng, Qiuhua Wang, Juan Li, Xuefei Qiu
Summary: A study on the chemical desorption of CO2 to sequester it again found the optimal reaction conditions and analyzed the effects of time, temperature, and stirring rate on the desorption efficiency of CO2. MEA exhibited the highest desorption rate among the five solutions, and multiple-cycle experiments showed its excellent absorption capacity.
INTERNATIONAL JOURNAL OF GREENHOUSE GAS CONTROL
(2021)
Article
Engineering, Chemical
Seung Won Jeong, Bomsock Lee, Sung Young Kim
Summary: As global climate change accelerates, Carbon Capture and Storage (CCS) technology has gained increasing attention. This study used an ammonia solvent instead of amines for chemical absorption in the carbon dioxide removal process, and found the operating conditions to achieve a carbon dioxide removal rate of over 90% as well as lower heat duty and operating costs. By manipulating the flow rate and adopting a split flow process, energy consumption was reduced by 10.24%.
Article
Chemistry, Physical
Zeynep Mine Senol, Elif Elma, Noureddine El Messaoudi, Valbone Mehmeti
Summary: This study investigated the performance of a cross-linked chitosan-zeolite composite adsorbent for the removal of Pb2+ ions from water. The results showed that the composite exhibited excellent adsorption performance with a maximum adsorption capacity of 275 mg/g. The adsorption process followed Langmuir and PSO models, and it was found to be spontaneous and endothermic.
JOURNAL OF MOLECULAR LIQUIDS
(2023)
Article
Engineering, Chemical
Nela Slavu, Adrian Badea, Cristian Dinca
Summary: This study analyzed the use of different concentrations of ammonia in capturing post-combustion CO2 in a coal-fired power station and compared it with the reference MEA case. The results showed that the CO2 capture cost was lowest for the process based on 7% ammonia, and the overall efficiency was optimized for 15% ammonia.
