A pervaporation method of separating a liquid organic compound mixture at a high speed and efficiency through an aromatic polyimide asymmetric separating membrane produced from an aromatic tetracarboxylic acid component comprising at least 70 molar% of biphenyl or diphenylether tetracarboxylic dianhydride and an aromatic diamine component comprising 85 molar% or more of an aromatic diamine having 2 to 3 benzene ring structure, or 15 molar% or more of 9,10-di(aminophenyl)anthracene, di(aminophenoxy)diphenylsulfone, di(aminophenoxy)biphenyl or di(aminophenoxy)diphenylalkane compounds, or a mixture of 15 to 50 molar% of an aromatic diamine having a one benzene or pyridine ring structure and 50 to 85 molar% of an aromatic diamine having a 2 to 3 benzene ring structure.
一种通过芳香族聚
酰亚胺不对称分离膜高速高效分离液体有机化合物混合物的渗透蒸发方法,该分离膜由芳香族四
羧酸组分和芳香族二胺组分制成,前者包含至少70摩尔%的
联苯或
二苯醚四
羧酸二酐,后者包含85摩尔%或以上的具有2至3个苯环结构的芳香族二胺、或 15 摩尔%或更多的 9,10-二(
氨基苯基)
蒽、二(
氨基苯氧基)
二苯砜、二(
氨基苯氧基)
联苯或二(
氨基苯氧基)二苯基烷化合物,或 15 至 50 摩尔%具有一个苯环或
吡啶环结构的芳香族二胺与 50 至 85 摩尔%具有 2 至 3 个苯环结构的芳香族二胺的混合物。