Patent ID: 11926707
Assignee: WUHAN UNIVERSITY OF TECHNOLOGY
Field: Chemical engineering (Chemistry)
Classification: CPC C  B  H  Y | IPC B  C  H

Claim 0:
1. A method of preparing a composite membrane of zeolite and polyimide, the method comprising:
1) adding zeolite to an organic solvent, and dispersing the zeolite uniformly to obtain a zeolite dispersion; adding a diamine monomer and a dianhydride monomer to the zeolite dispersion, and carrying out condensation polymerization reaction between the diamine monomer and the dianhydride monomer in the presence of the zeolite to obtain a casting solution of polyamic acid, the casting solution being doped with zeolite; wherein the zeolite is present in an amount of between 1 wt. % and 5 wt. % of the zeolite dispersion; and the zeolite is at least one of MCM-41, NaY, NaA and ZSM-5;
2) coating a surface of a substrate with the casting solution obtained in 1) to form a liquid membrane; placing the liquid membrane in an environment with a humidity of between 70% and 90% for preliminary phase separation, and placing the liquid membrane in a coagulation bath for complete phase separation, thereby obtaining a composite porous membrane of zeolite and polyamic acid; and
3) Performing thermal imidization on the composite porous membrane of zeolite and polyamic acid obtained in 2) through gradient heating to obtain the composite membrane of zeolite and polyimide.