Polybenzoxazole membranes from self-cross-linkable aromatic polyimide membranes

Patent metadata

Field	Value
Publication number	US-9308503-B2
Application number	US-201514812609-A
Country	US
Kind code	B2
Filing date	Jul 29, 2015
Priority date	Sep 27, 2013
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A method for separation of liquid mixtures with a polybenzoxazole (PBO) membrane from a self-cross-linked aromatic polyimide polymer membrane is provided.

First claim

The invention claimed is:

1. A process for separation of liquid mixtures by pervaporation comprising contacting said liquid mixture with a polybenzoxazole membrane of formula (III) wherein said formula (III) is:

wherein X 1 is selected from the group consisting of

and mixtures thereof; wherein X 3 is selected from the group consisting of

and mixtures thereof; wherein X 4 is selected from the group consisting of

and mixtures thereof; Y 1 is selected from the group consisting of

and mixtures thereof; Y 2 is selected from the group consisting of

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

and mixtures thereof; o and q are independent integers from 2 to 500; wherein said process comprises contacting the mixture of liquids to one side of the polybenzoxazole membrane of formula (III) to cause at least one gas to permeate said membrane; and removing from an opposite side of said polybenzoxazole membrane of formula (III) a permeate liquid composition comprising a portion of said at least one liquid that permeated said membrane.

2. The process of claim 1 wherein said liquid mixture comprises water and one or more organic compounds selected from the group consisting of alcohols, phenols, chlorinated hydrocarbons, pyridines, and ketones.

3. The process of claim 1 wherein said liquid mixture comprises sulfur-containing molecules in a hydrocarbon stream.

4. The process of claim 1 wherein said liquid mixture comprises a mixture of isomers of organic compounds.

5. The process of claim 1 wherein said liquid mixture comprises a mixture selected from the group consisting of ethylacetate-ethanol, diethylether-ethanol, acetic acid-ethanol, benzene-ethanol, chloroform-ethanol, chloroform-methanol, acetone-isopropylether, allylalcohol-allylether, allylalcohol-cyclohexane, butanol-butylacetate, butanol-1-butylether, ethanol-ethylbutylether, propylacetate-propanol, isopropylether-isopropanol, methanol-ethanol-isopropanol, and ethylacetate-ethanol-acetic acid.

6. The process of claim 1 wherein said liquid mixture comprises a dilute ethanol solution and where said process increases an ethanol concentration in said liquid mixture.

7. The process of claim 1 wherein in said formula (III), X 1 is selected from the group consisting of

and mixtures thereof.

8. The process of claim 1 wherein in said formula (III), X3 is selected from the group consisting of

and mixtures thereof.

9. The process of claim 1 wherein in said formula (III), X 4 is selected from the group consisting of

and mixtures thereof.

10. The process of claim 1 wherein in said formula (III), Y 1 is

11. The process of claim 1 wherein Y 2 is selected from the group consisting of

and mixtures thereof.

Assignees

• Uop Llc

Inventors

• Liu Chunqing
• Osman Zara
• Troxell Angela N

Classifications

• C07C27/28

  by distillation · CPC title

• B01D71/62

  Polycondensates having nitrogen-containing heterocyclic rings in the main chain · CPC title

• B01D67/0006 Primary

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

• B01D2323/30

  Cross-linking · CPC title

• B01D71/64 Primary

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