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Received December 6, 2016
Accepted March 16, 2017
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Efficient pressure swing adsorption for improving H2 recovery in precombustion CO2 capture
Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon 34141, Korea
jaewlee@kaist.ac.kr, jaelee43@gmail.com
Korean Journal of Chemical Engineering, June 2017, 34(6), 1763-1773(11), 10.1007/s11814-017-0080-7
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Abstract
An efficient design for pressure swing adsorption (PSA) operations is introduced for CO2 capture in the pre-combustion process to improve H2 recovery and CO2 purity at a low energy consumption. The proposed PSA sequence increases the H2 recovery by introducing a purge step which uses a recycle of CO2-rich stream and a pressure equalizing step. The H2 recovery from the syngas can be increased over 98% by providing a sufficient purge flow of 48.8% of the initial syngas feeding rate. The bed size (375m3/(kmol CO2/s)) and the energy consumption for the compression of recycled CO2-rich gas (6 kW/(mol CO2/s)) are much smaller than those of other PSA processes that have a CO2 compression system to increase the product purity and recovery.
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References
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Saberimoghaddam A, Nozari A, Korean J. Chem. Eng., 34(3), 822 (2017)
Na BK, Koo KK, Eum HM, Lee H, Song HK, Korean J. Chem. Eng., 18(2), 220 (2001)
