COMPOSITE HOLLOW FIBER MEMBRANES USEFUL FOR CO2 REMOVAL FROM NATURAL GAS

摘要

Disclosed herein is a composite hollow fiber polymer membrane including a porous core layer and a selective sheath layer. The porous core layer includes a polyamide-imide polymer, or a polyetherimide polymer, and the selective sheath layer includes a polyimide polymer, which is prepared from monomers A, B, and C. The monomer A is a dianhydride of the formula;;wherein X1 and X2 are independently halogenated alkyl group, phenyl or halogen and R1, R2, R3, R4, R5, and R6 are independently H, alkyl, or halogen. The monomer B is a diamino cyclic compound without a carboxylic acid functionality and the monomer C is a diamino cyclic compound with a carboxylic acid functionality. The polyimide polymer further includes covalent ester crosslinks. Also disclosed herein is a method of making the composite polymer membrane and a process for purifying natural gas utilizing the composite polymer membrane.

主权项

1. A composite hollow fiber polymer membrane, comprising:
a porous core layer comprising a polyamide-imide polymer; and a selective sheath layer on the core layer comprising a polyimide polymer prepared from monomers A, B, and C whereinA is a dianhydride of the formulawherein X1 and X2 are independently halogenated alkyl group, phenyl or halogen and R1, R2, R3, R4, R5, and R6 are independently H, alkyl, or halogen;B is a diamino cyclic compound without a carboxylic acid functionality; andC is a diamino cyclic compound with a carboxylic acid functionality; andwherein the polyimide polymer further comprises covalent ester crosslinks.