A new apparatus to enhance the rate of gas hydrate formation: Application to capture of carbon dioxide |
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| Authors: | Praveen Linga Rajnish Kumar Ju Dong Lee 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;3. Korea Institute of Industrial Technology, Busan, Republic of Korea;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 117585, Singapore;2. Lloyd''s Register Singapore Pte. Ltd., 138522, Singapore;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117585, Singapore;2. Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune, India;3. Department of Chemical and Biological Engineering, The University of British Columbia, Vancouver, Canada;1. Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore 117 576, Singapore;2. Chemical Engineering and Process Development Division, National Chemical Laboratory, Pune, India |
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| Abstract: | A new apparatus employing a modular, mechanically agitated gas-inducing crystallizer is used to demonstrate the capture of CO2 via hydrate crystallization. The crystallizer enhances the contact of hydrate forming gases with water and thus the rate of hydrate crystallization increases. Flue gas (CO2/N2) and fuel gas (CO2/H2) mixtures were used to represent post- and precombustion capture. A comparison between the rates of hydrate formation in different crystallizers is presented by defining a metric called the normalized rate of hydrate formation. The gas uptake and the separation efficiency for the fuel and flue gas mixtures were found to be greater compared to the results obtained in a smaller scale stirred tank reactor (Kumar et al., 2009c, Linga et al., 2008). The gas uptake and CO2 recovery for flue gas mixture in the presence of THF obtained in this work was higher than that reported in the literature with tetra-n-butyl ammonium bromide and tetra-n-butyl ammonium fluoride (Fan et al., 2009, Li et al., 2009). Although hydrate crystallization is able to capture CO2, the power required for mechanical agitation was found to be very significant. If the hydrate process is to be used industrially then hydrate crystallization must be carried out without mechanical agitation. |
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