1
Okan M Ekiner, John W Simmons: Gas separation membranes made from blends of aromatic polyamide, polymide or polyamide-imide polymers. E I Du Pont de Nemours and Company, Cary A Levitt, September 28, 1993: US05248319 (35 worldwide citation)

The present invention provides for gas separation membranes with superior gas transport properties made from a blend of certain polymers. In particular, certain alkyl substituted aromatic polyimides, polyamides or polyamide-imides are blended with certain aromatic polyimides to provide a gas separat ...


2
John W Simmons, Sudhir Kulkarni, Okan M Ekiner: Method for separating hydrocarbon-containing gas mixtures using hydrocarbon-resistant membranes. L Air Liquide Societe Anonyme A Directoire et Conseil De Surveillance Pour L Etude et L Exploitation Des Procedes Georges Claude, Linda K Russell, April 11, 2006: US07025804 (26 worldwide citation)

A method of separating or concentrating hydrocarbon-containing gas mixtures such as hydrogen from hydrocarbons, carbon dioxide from hydrocarbons, nitrogen from hydrocarbons, and hydrocarbons from one another using a selectively permeable membrane. The method is well suited to separate hydrocarbon-co ...


3
John W Simmons, Okan M Ekiner: Polyimide and polyamide-imide gas separation membranes. E I Du Pont de Nemours and Company, L Air Liquide, Cary A Levitt, August 3, 1993: US05232472 (22 worldwide citation)

Novel polyimide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides and polyamide-imides are formed from a blend of diamines containing the ester derived from 1,3-diamino-2-hydroxypropa ...


4
John W Simmons: Alkyl substituted polyimide, polyamide and polyamide-imide gas separation membranes. E I Du Pont de Nemours and Company, Cary A Levitt, November 30, 1993: US05266100 (19 worldwide citation)

Novel aromatic polyimide, polyamide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides, polyamides and polyamide-imides are formed from diamines of the formula ##STR1## where Ar' is ## ...


5
John W Simmons: Fluorinated aromatic polyimide, polyamide and polyamide-imide gas separation membranes. E I du Pont de Nemours and Company, L Air Liquide, Cary A Levitt, June 14, 1994: US05320650 (18 worldwide citation)

Novel fluorinated aromatic polyimide, polyamide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides, polyamides and polyamide-imides are formed from diamines of the formula ##STR1## whe ...


6
John W Simmons: Copolyimide gas separation membranes. L&apos Air Liquide Societe Anonyme pour l&apos Etude et l&apos Exploitation des Procedes Georges Claude, Jeffrey C Lew, May 7, 2002: US06383258 (18 worldwide citation)

A gas separation membrane is formed from a copolyimide produced by copolymerization of monomers which include o-tolidine sulfone, at least one other hydrophilic diamine and 2,2-bis(3,4-dicarboxyphenyl)hexafluoropropane dianhydride. One or more additional aromatic dianhydrides can optionally be inclu ...


7
John W Simmons, Okan Max Ekiner: Polyimide blends for gas separation membranes. L Air Liquide Societe Anonyme a Directoire et Conseil de Surveillance Pour l Etude et l Exploitation des Procedes Georges Claude, Linda K Russell, March 28, 2006: US07018445 (16 worldwide citation)

The present invention provides a selectively gas permeable membrane that has a superior combination of permeability and selectivity. The membrane composition includes a Type 1 copolyimide uniformly blended with a Type 2 copolyimide, which polymers are defined by chemical structure more specifically ...


8
John W Simmons, Okan M Ekiner: Polyimide and polyamide-imide gas separation membranes. E I Du Pont de Nemours and Company, L Air Liquides, Cary A Levitt, May 10, 1994: US05310415 (15 worldwide citation)

Novel polyimide and polyamide-imide gas separation membranes and the process of using such membranes to separate one or more gases from a gaseous mixture is disclosed. The polyimides and polyamide-imides are formed from a blend of diamines containing the ester derived from 1,3-diamino-2-hydroxypropa ...


9
John W Simmons: Polyimide gas separation membranes. L Air Liquide, Cary A Levitt, August 2, 1994: US05334697 (10 worldwide citation)

A polyimide gas separation membrane containing repeating units derived from 9,9-disubstituted xanthene dianhydride is disclosed.


10
John W Simmons: Block polyester-ether gas separation membranes. L Air Liquide Societe Anoyme a Directoire et Conseil de Surveillance Pour l Etude et l Exploitation des Procedes George Claude, Elwood L Haynes, March 1, 2005: US06860920 (8 worldwide citation)

Gas separation membranes formed from polyester-polyether block copolymers which are useful for separating gases from gas mixtures. The membranes and processes are especially suited for separating polar gases from mixtures that contain polar and non-polar species. The novel membranes exhibit good per ...