The Dow Chemical Company

The Cynara Co.

Bethanne L Smith

Stephen E Bales

Ritchie A Wessling

Henry N Beck

George J Quarderer, Jr

Thomas O Jeanes

Thomas Caldwell Young

David J Moll

Kent B McReynolds

Alan F Burmester

Charles Z Hotz

Ronald M Lacher

James E Clark

Gregory K Rickle

Paul G Glugla

Gas separations utilizing glassy polymer membranes at sub-ambient

This invention relates to a method of and apparatus for separating component gases in a gas mixture employing a glassy polymer membrane at temperatures of 5.degree. C. or less so as to achieve superior separation of gas components.

The present invention concerns a polyester gas separation membrane which is obtained by the interfacial polymerization of benzenetricarbonyl trihalide or benzene tetracarbonyl tetrahalide in a water-insoluble organic solvent in one phase and a variety of polyfunctional phenols present as the di- or tri-salt in a mixture of water and phase transfer agent and a water-soluble organic solvent in the second phase. The present invention also includes the polyester membrane itself, its methods of preparation and the use of the membranes to separate gas mixtures, such as carbon dioxide and methane, helium and methane and the like.

Interfacially polymerized polyester films

Growing community of inventors

Freeland, MI, United States of America

Bethanne L Smith