22-02-2018 дата публикации
Номер: US20180050309A1
Принадлежит:
The present invention discloses high selectivity copolyimide membranes for gas, vapor, and liquid separations. Gas permeation tests on these copolyimide membranes demonstrated that they not only showed high selectivity for CO/CHseparation, but also showed extremely high selectivities for H/CHand He/CHseparations. These copolyimide membranes can be used for a wide range of gas, vapor, and liquid separations such as separations of CO/CH, He/CH, CO/N, olefin/paraffin separations (e.g. propylene/propane separation), H/CH, He/CH, O/N, iso/normal paraffins, polar molecules such as HO, HS, and NHmixtures with CH, N, H. The high selectivity copolyimide membranes have UV cross-linkable sulfonyl functional groups and can be used for the preparation of UV cross-linked high selectivity copolyimide membranes with enhanced selectivities. The invention also includes blend polymer membranes comprising the high selectivity copolyimide and polyethersulfone. The blend polymer membranes comprising the high selectivity copolyimide and polyethersulfone can be further UV cross-linked under UV radiation. 2. The copolyimide membrane of wherein said copolyimide polymer has a weight average molecular weight in a range of 50 claim 1 ,000 to 1 claim 1 ,000 claim 1 ,000 Daltons.3. The copolyimide membrane of wherein said copolyimide polymer is selected from the group consisting of poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-3 claim 1 ,3′ claim 1 ,5 claim 1 ,5′-tetramethyl-4 claim 1 ,4′-methylene dianiline-3 claim 1 ,3′-diaminodiphenyl sulfone) copolyimide (TD-PI-3-2) claim 1 , poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-2 claim 1 ,4 claim 1 ,6-trimethyl-m-phenylenediamine-3 claim 1 ,3′-diaminodiphenyl sulfone) copolyimide (TPD-PI-3-2) claim 1 , poly(3 claim 1 ,3′ claim 1 ,4 claim 1 ,4′-diphenylsulfone tetracarboxylic dianhydride-2 claim 1 ,4 claim 1 ,6-trimethyl-1 claim 1 ,3-phenylenediamine-3 claim 1 ,3′- ...
Подробнее