Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 130, Issue -, Pages 132-140Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2014.04.028
Keywords
Separation; Active carbon; Hydrate; Methane; Carbon dioxide
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Funding
- National 973 Project of China [2012CB215005]
- National Natural Science Foundation of China [U1162205, 51376195]
- Program for New Century Excellent Talents from Ministry of Education [NCET-12-0968]
- Research Funds of China University of Petroleum, Beijing [01JB0171]
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An adsorption-hydration hybrid method was adopted to separate CO2/CH4 gas mixture using active carbon as adsorbent. The influence of water content and initial gas-solid ratio on the separation performance of CO2/CH4 mixture and the capacity of the recycled wet material were investigated. The experimental results show that when the water contents are 19.23 and 30.41 wt%, the adsorption-hydration hybrid method presents obvious advantage over single adsorption method. The molar fraction of CH4 can be enriched from 77.08% to 85.41% at the equilibrium pressure of 4.01 MPa for system with water content of 30.41 wt%. However, the separation performance for system with water content of 10.97 wt% is more likely to fall than rise due to no hydrate forms. Compared with the systems with fresh wet active carbon, the similar separation effect of CO2/CH4 could be attained with recycled wet material when under the same operation conditions. The property of the active carbon is stable confirmed from the scanning electron microscope measurements after it undergoes adsorption-hydration and desorption-hydrate dissociation process. (C) 2014 Elsevier B.V. All rights reserved.
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