HIGH HYDROCARBON RESISTANT CHEMICALLY CROSS-LINKED AROMATIC POLYIMIDE MEMBRANE FOR SEPARATIONS

摘要

This invention relates to high hydrocarbon resistant chemically cross-linked aromatic polyimide polymers, membranes and methods for making and using these polymers and membranes. The high hydrocarbon resistant chemically cross-linked aromatic polyimide membrane described in the present invention comprises a plurality of repeating units of a first aromatic polyimide comprising hydroxyl groups cross-linked with a second aromatic polyimide comprising carboxylic acid groups via covalent ester bonds. These membranes exhibit high permeability and selectivity in separation of mixtures of gases and liquids.

主权项

1. A chemically cross-linked aromatic polyimide polymer comprising a formula (I) wherein formula (I) is represented by the following formula: wherein R is selected from the group consisting of —H, —COCH3, and mixtures thereof; X1, X2, X3, and X4 are selected from the group consisting of and mixtures thereof, respectively; X1, X2, X3, and X4 are the same or different from each other; Y2 is selected from the group consisting of and mixtures thereof, and —R′— is selected from the group consisting of and mixtures thereof; Y1 is selected from the group consisting of and mixtures thereof; Y3 is selected from the group consisting of and mixtures thereof, and —R″— is selected from the group consisting of —H, COCH3, and mixtures thereof; n, m, n′ and m′ are independent integers from 2 to 500; n/m is in a range of 1:100 to 100:1; and n′/m′ is in a range of 1:100 to 100:1.