Production of improved polyimide separation membrane and its use

Production of improved polyimide separation membrane and its use

  • CN 1,293,080 A
  • Filed: 09/22/2000
  • Published: 05/02/2001
  • Est. Priority Date: 09/24/1999
  • Status: Abandoned Application
First Claim
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1. the method for from admixture of gas, separating one or more gases, this method comprises the step with first side contacts of described admixture of gas and compound polyimide gas separation membrane, thereby a part that makes described admixture of gas infiltrates into second side of described film and collects the part of the impermeability of described admixture of gas, the admixture of gas that obtains in second side of described film is compared with the mixture of described film first side and is rich in one or more compositions, wherein, described composite gas diffusion barrier forms as follows:

  • the solution that (a) forms polyamic acid salt in solvent system;

    (b) described solution is coated on the porous bottom on described porous bottom, to form coating;

    (c) by dry, immerse the bottom of described coating in the non-solvent or the combination of the two is solidified coating;

    (e) described polyamic acid salt deposit is transformed into polyimide layer.

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