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US6860920: Block polyester-ether gas separation membranes

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Filing Information

Inventor(s) John W. Simmons ·
Assignee(s) L'Air Liquide-Societe Anoyme a Directoire et Conseil de Surveillance Pour l'Etude et l'Exploitation des Procedes George Claude ·
Attorney/Agent(s) Elwood L. Haynes ·
Primary Examiner Robert H. Spitzer ·
Application Number US10388970
Filing date 03/13/2003
Issue date 03/01/2005
Prior Publication Data
Predicted expiration date 03/13/2023
U.S. Classifications 95/49  · 96/7  · 96/4  · 95/52  · 96/13  · 96/14  · 95/51  ·
International Classifications --
Kind CodeB2
International Classifications 95 45 · 95 49 · 95 51 · 95 52 · 96 4 · 96 7 · 96 11- 14 ·
Related U.S. Application DataRELATED APPLICATIONS
This application claims priority from U.S. Provisional Application No. 60/368,471 filed Mar. 28, 2002.
49 Claims, No Drawings


Abstract

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 permeability and permselectivity as well as durability, making them well suited for industrial applications such as removal of acid gases from natural gas and removal of carbon dioxide from synthesis gas.

Independent Claims | See all claims (49)

  1. 1. A process for separating component gases of a gas mixture comprising the steps of: a) providing a permeable membrane comprising a polyester-polyether block copolymer comprising repeating units of a polymer soft segment of formula (Is) and a polymer hard segment of formula (Ih): wherein Ra is an aliphatic or aromatic radical; s denotes soft; h denotes hard; (PE) is a polyether segment; and Rd is a linear or branched aliphatic radical; b) contacting a first side of the membrane with a feed gas mixture; and c) causing a component of said feed gas mixture to selectively permeate through said permeable membrane, thereby forming on a second side of the membrane a permeate composition which has a greater concentration of said component than that of said feed mixture.
  2. 26. A permeable membrane for separating and/or concentrating gases comprising: a permeable membrane comprising a polyester-polyether block copolymer, wherein said polyester-polyether block copolymer comprises repeating units of a polymer soft segment of formula (Is) and a polymer hard segment of formula (Ih): wherein Ra is an aliphatic or aromatic radical; s denotes soft; h denotes hard; (PE) is a polyether segment; and Rd is a linear or branched aliphatic radical.
  3. 40. A block copolymer membrane for separating and/or concentrating gases comprising: a permeable membrane comprising a polyester-polyether block copolymer, wherein said polyester-polyether block copolymer comprises repeating units of polymer soft segments of formula (Is) and polymer hard segments of formula (Ih): wherein Ra of formulae (Is) and (Ih) is an aliphatic or aromatic radical; s denotes soft; h denotes hard; (PE) is a polyether segment; Rd of formula (Ih) is a linear or branched aliphatic radical.

References Cited

U.S. Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
US3822202* DU PONT Hoehn Jul 1974
US4613440* Allied Corporation Zupancic et al. Sep 1986
US4636229* Nippon Oil Company, Limited Itoh et al. Jan 1987
US4745142* Teijin Limited Ohwaki et al. May 1988
US4963165 Membrane Technology & Research, Inc. Blume et al. Oct 1990
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US5085676 E. I. du Pont de Nemours and Company Ekiner et al. Feb 1992
US5209848* The Dow Chemical Company Jeanes et al. May 1993
US5352273* E. I. Du Pont de Nemours and Company Simmons et al. Oct 1994
US5393323* L'Air Liquide S.A. Simmons Feb 1995
US5393324* L'Air Liquide S.A. Simmons Feb 1995
US5474596* L'Air Liquide S.A. Simmons Dec 1995
US5611843 Exxon Research and Engineering Company Ho Mar 1997
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US5820992* National Chemical Laboratory Jadhav et al. Oct 1998
US5969082* Teijin Limited Kuwahara et al. Oct 1999
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US6425936* Gas Separatation Technology, Inc. Sammons et al. Jul 2002

Foreign Patent Documents

Document NumberAssigneesInventorsIssue/Pub Date
DE19631841GEESTHACHT GKSS FORSCHUNGFeb 1998
EP0781795TEIJIN LIMITEDJul 1997
WO200076634GAS SEPARATION TECHNOLOGY, INC.Dec 2000
* cited by examiner

Other Publications

International Search Report to PCT/IB 03/01113.