Gas separation membrane with ultrathin layer
First Claim
Patent Images
1. A gas separation membrane comprising a thick polymer layer, and an ultrathin polymer layer, wherein:
- said ultrathin layer is 10 to about 90 A thick; and
provided that;
the selectivity of the polymer of said ultrathin layer is higher than the selectivity of the polymer of said thick layer; and
the selectivity of said membrane is greater or equal to the selectivity calculated for said thick layer, assuming said thick layer is defect-free.
2 Assignments
0 Petitions
Accused Products
Abstract
This invention is a gas separation membrane containing two polymer layers, a relatively thick layer, and an ultrathin layer, 10 to about 200 A thick. The ultrathin layer polymer is more selective than the polymer used in the thick layer. Also provided is a process for making such membranes.
-
Citations
46 Claims
-
1. A gas separation membrane comprising a thick polymer layer, and an ultrathin polymer layer, wherein:
-
said ultrathin layer is 10 to about 90 A thick; and
provided that;the selectivity of the polymer of said ultrathin layer is higher than the selectivity of the polymer of said thick layer; and the selectivity of said membrane is greater or equal to the selectivity calculated for said thick layer, assuming said thick layer is defect-free. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. An apparatus comprising a thick polymer layer, and an ultrathin polymer layer, wherein:
-
said ultrathin layer is 10 to about 90 A thick; and
provided that;the selectivity of the polymer of said ultrathin layer is higher than the selectivity of the polymer of said thick layer; and the selectivity of said membrane is greater or equal to the selectivity calculated for said thick layer, assuming said thick layer is defect-free. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 29, 30)
-
-
28. A process for the production of a gas separation membrane, comprising, contacting the surface of a thick layer of a first polymer with a solution of a second polymer in a solvent, provided that:
-
said solvent does not dissolve or otherwise substantially affect said thick first polymer layer; said first polymer, second polymer and solvent are chosen so that said second polymer is adsorbed on the surface of said thick first polymer layer; and the final thickness of an ultrathin second polymer layer formed after solvent removal is about 10 to about 200 A. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46)
-
Specification