Phenyl-modified polydimethylsiloxane (PDMS) separation membrane, fabrication method thereof, and use thereof in separation of aromatic compound

Patent metadata

Field	Value
Publication number	US-11969697-B2
Application number	US-202217970595-A
Country	US
Kind code	B2
Filing date	Oct 21, 2022
Priority date	Oct 22, 2021
Publication date	Apr 30, 2024
Grant date	Apr 30, 2024

Abstract

The present disclosure relates to a phenyl-modified polydimethylsiloxane (PDMS) separation membrane, a fabrication method thereof, and a use thereof in the separation of an aromatic compound, and belongs to the technical field of separation membrane materials. A phenyl-modified PDMS separation membrane comprising a substrate layer and a selective layer is provided.

First claim

What is claimed is:

1. A method of using a phenyl-modified polydimethylsiloxane (PDMS) separation membrane in the separation of a solution comprising an organic compound being phenol, phenyl methanol, or phenyl ethanol,
wherein the phenyl-modified PDMS separation membrane comprises a substrate layer and a selective layer, wherein the phenyl-modified PDMS separation membrane is fabricated through the following steps:
step 1. subjecting a hydroxyl-terminated PDMS-based compound, a crosslinker, and a catalyst to a crosslinking reaction in an organic solvent to obtain a casting solution; and
step 2. coating the casting solution on a substrate, and conducting a thermal crosslinking reaction to obtain the phenyl-modified PDMS separation membrane;
wherein the hydroxyl-terminated PDMS-based compound has a structure represented by formula III:

the crosslinker is tetraethyl orthosilicate; a concentration of the hydroxyl-terminated PDMS-based compound in the organic solvent ranges from 5 wt % to 15 wt %;
the hydroxyl-terminated PDMS-based compound has a molecular weight Mw of 80,000;
the hydroxyl-terminated PDMS-based compound, the crosslinker, and the catalyst are in a mass ratio of 100:(5-15):(0.1-5); and
a material for the substrate layer is polytetrafluoroethylene with a pore size of 110 nm to 220 nm.

2. The method according to claim 1 , wherein the catalyst is an organic tin catalyst.

3. The method according to claim 1 , wherein the thermal crosslinking reaction is conducted at 50° C. to 85° C.

4. The method according to claim 1 , wherein the thermal crosslinking reaction is conducted for 1 h to 36 h.

5. The method according to claim 1 , wherein the organic compound is selected from the group consisting of an alcohol compound and an aromatic compound.

6. The method according to claim 1 , wherein the solution is an aqueous solution.

7. The method according to claim 1 , wherein a concentration of the organic compound in the solution is 0.1 wt % to 10 wt %.

Assignees

• Nanjing University Of Technology

Inventors

• Liu Gongping
• Pan Yang
• Jin Wanqin
• Zhu Haipeng

Classifications

• B01D71/82 Primary

  characterised by the presence of specified groups, e.g. introduced by chemical after-treatment · CPC title

• B01D61/362

  Pervaporation · CPC title

• B01D67/0006

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

• B01D67/0011

  Casting solutions therefor · CPC title

• B01D67/0013

  Casting processes · CPC title