Method for high-pressure gas separation

• US 6,755,893 B2
• Filed: 12/26/2002
• Issued: 06/29/2004
• Est. Priority Date: 06/29/2000
• Status: Expired due to Fees

• Current Assignee: Gkss-Forschungszentrum Geesthacht GmbH, Technische Universitã¤T Hamburg-Harburg, TuTech Innovation GmbH (Technische Universität Kaiserslautern), TUHH Tech GmbH
• Original Assignee: Technische Universitã¤T Hamburg-Harburg
• Inventors: Kulcke, Walter, Sartorelli, Lorenza, Schossig, Michael, Brunner, Gerd, Peinemann, Klaus-Victor
• Primary Examiner(s): Spitzer, Robert H.
• Application Number:
  US10/330,044
• Publication Number:
  US 20030183079A1
• Time in Patent Office: 551 Days
• Field of Search: 95/45, 95/51, 96/4, 96/13, 96/14
• US Class Current: 95/51
• CPC Class Codes: B01D 53/228 characterised by specific membranes
• CPC Class Codes: Y02C 20/40 of CO2

Abstract

In a method for the separation of supercritical gas from substances dissolved in the gas with a membrane through which the gas passes while the substances dissolved in the gas is retained, a pore-free membrane of a polymer perfluoro-2,2-diemthyl-1,3-dioxole is used as a membrane in the separation process.

Claims

1. A method for the high pressure separation of supercritical gas from a component dissolved therein, said method comprising the steps of providing in a separation chamber, a gas-permeable, pore-free membrane consisting of the polymer perfluoro-2,2-dimethyl-1,3-dioxol as a separation member between two spaces of said separation chamber and supplying a supercritical gas including said component to one side of said membrane for transfer of said supercritical gas through said membrane, thereby separating said gas as permeate from said component while retaining said component as retentate.

2. A method according to claim 1, wherein said polymer is a homopolymer comprising perfluoro-2,2-dlmethyl-1,3-dioxol.

3. A method according to claim 1, wherein said polymer is a copolymer comprising perfluoro-2,2-dimethyl-1,3-dioxol and tetrafluoroethylene.

4. A method according to claim 3, wherein said copolymer contains 65-99 mol % perfluoro-2,2-dimethyl-1,3-dioxol.

5. A method according to claim 1, wherein said gas is supercritical carbon dioxide.

6. A method according to claim 1, wherein said membrane is a composite membrane including a selective separation layer of perfluoro-2,2-dimethyl-1,3-dioxol and tetrafluoroethylene.

7. A method according to claim 6, wherein the selective separation layer has a thickness of 0.2 to 20 μ

m.

8. A method according to claim 6, wherein said selective separation layer is disposed on a carrier membrane consisting of polyether imide.

9. A method according to claim 6, wherein said selective separation layer is disposed on a carrier membrane of porous polyvinylidene fluoride.

10. A method according to claim 6, wherein said selective separation layer is disposed on a carrier membrane of porous polyether sulfone.

11. A method according to claim 6, wherein said selective separation layer is disposed on a carrier membrane of porous polyacryl nitrile.

12. A method according to claim 6, wherein said selective separation layer is disposed on a carrier membrane of a porous organic ceramic material.