Capture of carbon dioxide from flue or fuel gas mixtures by clathrate crystallization in a silica gel column |
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| Authors: | Adebola Adeyemo Rajnish Kumar Praveen Linga John Ripmeester Peter Englezos |
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| Institution: | 1. Department of Chemical and Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, Canada V6T 1Z3;2. Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, ON, Canada K1A 0R6;1. Clean Energy Research Centre, Department of Chemical and Biological Engineering, University of British Columbia, Vancouver, BC, Canada;2. Steacie Institute for Molecular Sciences, National Research Council Canada, Ottawa, ON, Canada;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;2. Lloyd''s Register Singapore Pte. Ltd., 138522, Singapore;1. The Petroleum and Petrochemical College, Chulalongkorn University, Bangkok 10330, Thailand;2. UOP, A Honeywell Company, Des Plaines, IL 60017, USA;3. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117575, Singapore;1. College of Petroleum Engineering, Liaoning Shihua University, Fushun 113001, China;2. School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China;3. College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun 113001, China;4. School of Energy and Power Engineering, Dalian University of Technology, Dalian 116000, China;1. Mining Technology Institute, Taiyuan University of Technology, Taiyuan 030024, PR China;2. Key Laboratory of In-situ Property Improving Mining of Ministry of Education, Taiyuan University of Technology, Taiyuan 030024, PR China;3. College of Mining Engineering, Taiyuan University of Technology, Taiyuan 030024, PR China |
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| Abstract: | A column of silica gel was employed to contact water with flue gas (CO2/N2) mixture to assess if CO2 can be separated by hydrate crystallization. Three different silica gels were used. One with a pore size of 30 nm (particle size 40–75 μm) and two with a pore size of 100 nm and particle sizes of 40–75 and 75–200 μm respectively. The observed trends indicate that larger pores and particle size increase the gas consumption, CO2 recovery, separation factor and water conversion to hydrate. Thus, the gel (gel #3) with the larger particle size and larger pore size was chosen to carry out experiments with concentrated CO2 mixtures and for experiments in the presence of tetrahydrofuran (THF), which itself is a hydrate forming substance. Addition of THF reduces the operating pressure in the crystallizer but it also reduces the gas uptake. Gel #3 was also used in experiments with a fuel gas (CO2/H2) mixture in order to recover CO2 and H2. It was found that the gel column performs as well as a stirred reactor in separating the gas components from both flue gas and fuel gas mixtures. However, the crystallization rate and hydrate yield are considerably enhanced in the former. Finally the need for stirring is eliminated with the gel column which is enormously beneficial economically. |
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