SOLVENT-RESISTANT ASYMMETRIC HOLLOW FIBER GAS SEPARATION MEMBRANE, AND METHOD FOR PRODUCTION THEREOF
申请人:Ube Industries, Ltd.
公开号:EP2239049A1
公开(公告)日:2010-10-13
An asymmetric hollow fiber gas separation membrane obtained by subjecting an asymmetric hollow fiber polyimide membrane to a heat treatment having a maximum temperature of from 350 to 450°C, wherein the asymmetric hollow fiber polyimide membrane is formed with a polyimide essentially having a repeating unit represented by a general formula (1):
is excellent in a solvent resistance and a thermal stability, and as well has such a mechanical strength that a tensile elongation at break is not less than 10 % as a hollow fiber membrane. In the general formula (1), 20 to 80 mol% of A is a tetravalent unit based on a biphenyl structure represented by formula (2), 20 to 80 mol% of A is a tetravalent unit based on a diphenylhexafluoropropane structure represented by formula (3), and 0 to 30 mol% of A is a tetravalent unit based on a phenyl structure represented by formula (4); and in the general formula (1), 30 to 70 mol% of R is a divalent unit represented by formula (5) and/or formula (6), and 30 to 70 mol% of R is a divalent unit having one or two other aromatic rings than formula (5) or (6),
wherein, R1 and R2 are a hydrogen atom or an organic group, and n is 0, 1 or 2,
wherein, R1 and R2 are a hydrogen atom or an organic group, X is -CH2- or -CO-, and n is 0, 1 or 2.
一种非对称中空纤维气体分离膜,通过对非对称中空纤维聚酰亚胺膜进行最高温度为 350 至 450°C 的热处理而获得,其中非对称中空纤维聚酰亚胺膜由基本上具有通式(1)所代表的重复单元的聚酰亚胺形成:
具有优异的耐溶剂性和热稳定性,以及作为中空纤维膜的机械强度,断裂伸长率不小于 10%。在通式(1)中,20-80 摩尔%的 A 是基于式(2)所代表的联苯结构的四价单元,20-80 摩尔%的 A 是基于式(3)所代表的二苯基六氟丙烷结构的四价单元,0-30 摩尔%的 A 是基于式(4)所代表的苯基结构的四价单元;在通式(1)中,30 至 70 摩尔%的 R 是由式(5)和/或式(6)代表的二价单元,30 至 70 摩尔%的 R 是具有比式(5)或(6)多一个或两个芳香环的二价单元、
其中,R1 和 R2 是氢原子或有机基团,n 是 0、1 或 2、
其中,R1 和 R2 是氢原子或有机基团,X 是 -CH2- 或 -CO-,n 是 0、1 或 2。