High hydrocarbon resistant chemically cross-linked aromatic polyimide membrane for separations

Patent metadata

Field	Value
Publication number	US-9296866-B2
Application number	US-201514729254-A
Country	US
Kind code	B2
Filing date	Jun 3, 2015
Priority date	Jun 28, 2013
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

This invention relates to high hydrocarbon resistant chemically cross-linked aromatic polyimide polymers, membranes and methods for making and using these polymers and membranes. The high hydrocarbon resistant chemically cross-linked aromatic polyimide membrane described in the present invention comprises a plurality of repeating units of a first aromatic polyimide comprising hydroxyl groups cross-linked with a second aromatic polyimide comprising carboxylic acid groups via covalent ester bonds. These membranes exhibit high permeability and selectivity in separation of mixtures of gases and liquids.

First claim

The invention claimed is:

1. A chemically cross-linked aromatic polyimide polymer comprising a formula (I) wherein formula (I) is represented by the following formula:

wherein R is —COCH 3 or,

and mixtures thereof; X1, X2, X3, and X4 are selected from the group consisting of

and mixtures thereof respectively; Y2 is selected from the group consisting of

and mixtures thereof, and —R′— is selected from the group consisting of

and mixtures thereof; Y1 and Y3 are selected from the group consisting of

and mixtures thereof;

n, m, n′ and m′ are independent integers from 2 to 500; n/m is in a range of 1:100 to 100:1; and n′/m′ is in a range of 1:100 to 100:1.

2. The chemically cross-linked aromatic polyimide polymer of claim 1 wherein n/m is in a range of 1:10 to 5:1.

3. The chemically cross-linked aromatic polyimide polymer of claim 1 wherein n′/m′ is in a range of 1:10 to 5:1.

4. A chemically cross-linked aromatic polyimide membrane comprising the chemically cross-linked aromatic polyimide polymer of claim 1 .

5. The chemically cross-linked aromatic polyimide membrane of claim 1 comprising a coating selected from the group consisting of a polysiloxane, a fluoro-polymer, a thermally curable silicone rubber, and a UV radiation curable epoxy silicone.

Assignees

• Uop Llc

Inventors

• Liu Chunqing
• Osman Zara

Classifications

• B01D61/145

  Ultrafiltration · CPC title

• B01D2325/20

  Specific permeability or cut-off range · CPC title

• B01D69/125

  In situ manufacturing by polymerisation, polycondensation, cross-linking or chemical reaction · CPC title

• B01D67/0006

  by chemical reactions (in-situ polymerisation, polycondensation, cross-linking or reaction for manufacturing composite membranes B01D69/125) · CPC title

• C08J2379/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title