期刊
JOURNAL OF MEMBRANE SCIENCE
卷 382, 期 1-2, 页码 212-221出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2011.08.015
关键词
Asymmetric hollow fiber; Defect-free; Crosslink; Plasticization; Natural gas
资金
- Chevron Energy Technology Company
- United States Department of Energy [DE-FG03-95ER14538]
- King Abdullah University of Science and Technology (KAUST) [KUS-I1-011-21]
Decarboxylation-induced thermal crosslinking has been demonstrated to be effective for stabilizing membranes against plasticization in dense films. This study extends this promising crosslinking approach from dense films to industrially relevant asymmetric hollow fiber membranes. Crosslinkable asymmetric hollow fiber membranes were spun from a carboxylic acid containing polyimide, 6FDA-DAM:DABA. Dope and spinning conditions were optimized to obtain fibers with a defect-free selective skin layer. It is found that slightly defective fibers suffered severe selectivity loss after thermal crosslinking, suggesting that defect-free property is essential to the performance of the resulting crosslinked hollow fiber membranes. The crosslinked fibers were tested for CO2/CH4 separation. The excellent plasticization resistance under high pressure feeds (with highest CO2 partial pressure of 400 psia) suggests that these robust membranes are promising for aggressive natural gas purification. (C) 2011 Elsevier B.V. All rights reserved.
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