The Dow Chemical Company

Mg Generon

Polyfuel, Inc.

Generon Igs, Inc.

The Cynara Co.

Thomas O Jeanes

Stephen E Bales

John A Jensvold

Ritchie A Wessling

Henry N Beck

George J Quarderer, Jr

Frederick L Coan

Thomas Caldwell Young

Jian Ping Chen

David J Moll

Helen Xiao Xu

Kent B McReynolds

Alan F Burmester

Shuguang Cao

Charles Z Hotz

Bethanne L Smith

Kie Hyun Nam

Ronald M Lacher

James E Clark

David Olmeijer

Joginder N Anand

John D Summers

Darrell C Feay

Pamela J Leong

John O Osby

Theodore L Parker

Edgar S Sanders, Jr

Scott S Campbell

This invention relates to ion conducting random copolymers that are useful in forming polymer electrolyte membranes used in fuel cells.

Ion conductive random copolymers

This invention relates to sulfonated copolymers which are useful in forming polymer electrolyte membranes used in fuel cells.

Sulfonated copolymer

This invention relates to ion conductive copolymers which are useful in forming polymer electrolyte membranes used in fuel cells.

Ion conductive block copolymers

Methods of synthesizing high molecular weight polycarbonate polymers are described. Also described are polycarbonates produced by these methods.

Two step production of polycarbonates

A gas separation system comprising one or more ceramic membranes is described. The system, particularly, the arrangement of the ceramic membranes and/or other polymeric membranes or PSA systems, results in maximum durability of the ceramic membranes.

Ceramic deoxygenation hybrid systems for the production of oxygen and nitrogen gases

A surface modified gas separation membrane having improved permselective properties for separating a mixture of gases as compared to the unmodified membrane, is described. The gas separation membrane is made by a process comprising the steps of coating a surface unmodified gas separation membrane with a solution of a coating material, wherein the coating material is an organic material having at least one site of unsaturation; heating the coated gas separation membrane; and contacting the heated coated gas separation membrane with at least one oxidizing agent for a time effective to surface modify the gas separation membrane to produce the surface modified gas separation membrane having improved permselectivity.

Ozone treatment of surface of membrane to improve permselectivity

A gas-separation membrane enables the economical separation of noble gases, especially xenon, from oxygen, nitrogen, carbon dioxide or mixtures of the latter gases. The membrane of the present invention includes a thin discriminating layer selected from the group consisting of polycarbonate, polyester, and polyestercarbonate. In the preferred embodiment, the thin discriminating layer includes material selected from the bisphenolic group consisting of 2,2-bis(3,5-dibromo-4-hydroxyphenyl)propane, 2,2-bis(3,5-dichloro-4-hydroxyphenyl)propane, and 9,9-bis(3,5-dibromo-4-hydroxyphenyl)fluorene. The invention also includes the method of using the membrane, made as described above, either in a single-stage process or in a multiple-stage process, to provide the desired product gas. Several membrane units, made according to the present invention, may be manifolded together so as to operate in a parallel fashion, to provide an increased volume of product gas at the same desired purity. Alternatively, two or more membrane devices may be connected in a series or staged configuration to provide a smaller volume of highly purified product gas.

Membrane for separation of xenon from oxygen and nitrogen and method of using same

A method for preparing a surface modified gas separation membrane, wherein said membrane has improved permselective properties for separating a mixture of gases as compared to the unmodified membrane, is described. The method comprises coating a surface unmodified gas separation membrane with a solution of a coating material, wherein the coating material is an organic material having at least one site of unsaturation; heating the coated gas separation membrane; and contacting the heated coated gas separation membrane with at least one oxidizing agent for a time effective to surface modify the gas separation membrane to produce the surface modified gas separation membrane having improved permselectivity.

A boreside feed gas separation membrane device containing primarily hollow fiber membranes with discrete flow channels incorporated into the bundle to allow for pressure removal of the permeate gas collected on the shellside of the device is described. The flow channels minimize pressure drop and/or the build-up of back pressure on the shellside of the device while maintaining proper counter-current flow patterns in the device. The incorporation of flow channels results in improved efficiency of the device, especially for feed streams or membrane types that lead to high permeate flow rate that result in excessive shellside pressure drops.

Boreside feed modules with permeate flow channels

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 invention relates to novel xylylene based polyether gas separation membranes and a method of separating gases using such membranes.

Xylylene based polyether membranes for gas separation

The invention relates to novel aryl carbonate cyanoaryl ether copolymers.

Arylene carbonate cyanoaryl ether copolymer

This invention relates to novel polyimides derived from alicyclic dianhydrides and a process for synthesizing the polyimides.

Growing community of inventors

Antioch, CA, United States of America

Thomas O Jeanes