High selectivity epoxysilicone-cross-linked polyimide membranes for gas separations

摘要

The present invention provides a high selectivity epoxysilicone-cross-linked polyimide membrane comprising a polyimide polymer with hydroxyl functional groups cross-linked with epoxy functional groups on epoxysilicone polymer. The present invention also provides a process for separating at least one gas from a mixture of gases using the high selectivity epoxysilicone-cross-linked polyimide membrane. The process comprises providing the high selectivity epoxysilicone-cross-linked polyimide membrane which is permeable to the at least one gas; contacting the mixture on one side of the membrane to cause the at least one gas to permeate the membrane; and removing from the opposite side of the membrane a permeate gas composition comprising a portion of the at least one gas which permeated the high selectivity epoxysilicone-cross-linked polyimide membrane.

主权项

1. An epoxysilicone-cross-linked polyimide membrane comprising an epoxysilicone-cross-linked polyimide polymer wherein said epoxysilicone-cross-linked polyimide polymer comprises a plurality of repeating units of formula (I), wherein formula (I) is wherein R is selected from the group consisting of MDxDEyQzTuDRfjDAkDPl(D′(CH(R′)CH2O)m)nDBpM, MEDxDEyQzTuDRfjDAkDPl(D′(CH(R′)CH2O)m)nDBpME, MEDxDEyQzTuDRfjDAkDPl(D′(CH(R′)CH2O)m)nDBpM, and mixtures thereof; wherein M=(CH3)3SiO1/2, ME= D=(CH3)2SiO2/2, D′=(CH3)3SiO2/2, DE= DRf=(CF3CH2CH2)(CH3)SiO2/2, DA=((HO)(C2H3)C6H9(CH2)2(CH3)SiO2/2, DP=((HO)(C6H4)(CH2)3)(CH3)SiO2/2, DB=((C6H5COO)(HO)(C6H9)(CH2)2)(CH3)SiO2/2, Q=SiO4/2, T=(CH3)3SiO3/2, wherein R′ is selected from the group consisting of hydrogen, methyl, and ethyl, and wherein j, k, l, m, n, p, x, y, z, and u are positive integers and j, k, l, n, p, u, and z may be zero; wherein X1 and X2 are selected from the group consisting of and mixtures thereof, respectively; X1 and X2 are the same or different from each other; wherein Y1 is selected from the group consisting of and mixtures thereof, Y2 is selected from the group consisting of and mixtures thereof, R″ is selected from the group consisting ofand mixtures thereof, and R′″ is selected from the group consisting of —H, COCH3, and mixtures thereof; and wherein a, b, and c are independent integers from 1 to 500.