发明名称 |
CARBON MOLECULAR SIEVE (CMS) HOLLOW FIBER MEMBRANES AND PREPARATION THEREOF FROM PRE-OXIDIZED POLYIMIDES |
摘要 |
Prepare a carbon molecular sieve membrane from a polyimide (e.g., a 6FDA/BPDA-DAM polyimide) that has a glass transition temperature of at least 400° C and includes a bridged phenyl compound for separation of hydrogen and ethylene from one another whether present as a pure mixture of hydrogen and ethylene or as components of a cracked gas. Preparation comprises two sequential steps a) and b). In step a), place a membrane fabricated from defect-free fibers of the polyimide in contact with an oxygen-containing atmosphere under conditions of time and temperature sufficient to produce a pre-oxidized and pre-carbonized polymeric membrane that is insoluble in hot (110 C) n-methylpyrolidone and at least substantially free of substructure collapse. In step b) pyrolyze the pre-oxidized and pre-carbonized membrane in the presence of a purge gas under conditions of time and temperature sufficient to yield a carbon molecular sieve membrane that has at least one of a hydrogen permeance and a hydrogen/ethylene selectivity greater than that of a carbon molecular sieve membrane prepared from the same membrane using only pyrolysis as in step b). |
申请公布号 |
WO2016048612(A1) |
申请公布日期 |
2016.03.31 |
申请号 |
WO2015US48230 |
申请日期 |
2015.09.03 |
申请人 |
DOW GLOBAL TECHNOLOGIES LLC |
发明人 |
XU, LIREN |
分类号 |
B01D67/00;B01D69/08;B01D71/02 |
主分类号 |
B01D67/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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