Polyimide blend membranes for gas separations
AssigneeUop LLC
InventorsChunqing Liu, Howie Q. Tran
Life of this patent
Estimating the term…
Abstract
The polyimide blend membrane in the present invention was prepared by blending a first aromatic polyimide with high permeability and a second aromatic polyimide with high selectivity for gas separation. The polyimide blend membrane in the present invention showed improved permeability compared to membranes made from the second aromatic polyimide and improved selectivity compared to membranes made from the first aromatic polyimide.
Claims10
A polyimide blend membrane comprising a miscible blend of a first aromatic polyimide that comprises a plurality of repeating units of formula (I) and a second aromatic polyimide that comprises a plurality of repeating units of formula (II), wherein formula (I) is represented by:
- wherein n, m, o, and p are independent integers from 20 to 500;
- and wherein formula (II) is represented by:
- wherein q and r are independent integers from 20 to 500;
- and wherein the weight ratio of said first aromatic polyimide to said second aromatic polyimide is in a range from about 10:1 to 1:10.
Dependencies are inferred from the claim text.