Cheryl L Jones

US Patent:

52883043, Feb 22, 1994

Filed:

Mar 30, 1993

Appl. No.:

8/052423

Inventors:

William J. Koros - Austin TX
Cheryl W. Jones - Austin TX

Assignee:

The University of Texas System - Austin TX

International Classification:

B01D 5322

US Classification:

95 45

Abstract:

The invention provides carbon membranes for use in fluid separation processes, particularly gas separations, which are treated with a coating that provides a protective barrier which significantly limits permeation of water vapor or other impurities such as hydrocarbons without significantly inhibiting permeation of the faster fluid component or lowering selectivity. The composite membranes retain good fluid separation properties and are resistant to the adverse effects on membrane performance commonly observed in environments having high humidity. The coating is preferably an amorphous polymer of perfluoro-2,2-dimethyl-1,3-dioxole. The membranes can be of a varied configuration: sheet form, hollow fiber, asymmetrical membranes and the like.