Dye-salt separation membrane and preparation method thereof

Patent metadata

Field	Value
Publication number	US-2020398227-A1
Application number	US-202016907173-A
Country	US
Kind code	A1
Filing date	Jun 20, 2020
Priority date	Jun 22, 2019
Publication date	Dec 24, 2020
Grant date	—

Abstract

The present invention relates to a dye-salt separation membrane and a preparation method thereof. The method includes the following steps: firstly pouring an aqueous phase solution containing tannic acid and anhydrous piperazine on a surface of a polysulfone-based ultrafiltration base membrane at a mass ratio of the tannic acid to the anhydrous piperazine of 1:2 to 2:1, followed by complete infiltration, and draining the aqueous phase solution; and then pouring an organic phase solution of trimesoyl chloride on the surface of the base membrane, and draining the organic phase solution to obtain the dye-salt separation membrane. The method of the present invention is simple and easy to implement, and the dye-salt separation membrane prepared by the method has a relatively high solution permeability, an efficient dye retention and permeability of inorganic salts, thereby achieving an excellent dye-salt separation effect.

First claim

What is claimed is:

1 . A method for preparing a dye-salt separation membrane, comprising the following steps:
step 1: pouring an aqueous phase solution containing tannic acid and anhydrous piperazine on a surface of a polysulfone-based ultrafiltration base membrane at a mass ratio of the tannic acid to the anhydrous piperazine of 1:2 to 2:1, followed by complete infiltration for 3 to 6 minutes, and then draining the aqueous phase solution; and step 2: pouring an organic phase solution of trimesoyl chloride on the surface of the polysulfone-based ultrafiltration base membrane obtained in step 1, followed by complete infiltration for 0.5 to 2 minutes, then draining the organic phase solution, and after the organic phase solution being completely evaporated, storing the resulting dye-salt separation membrane in water.

2 . The method according to claim 1 , wherein in step 1, the polysulfone-based ultrafiltration base membrane is selected from polyethersulfone, polysulfone, or sulfonated polyethersulfone.

3 . The method according to claim 1 , wherein in step 1, the aqueous phase solution contains the tannic acid and the anhydrous piperazine at a combined mass fraction of 0.2 wt %.

4 . The method according to claim 1 , wherein in step 1, the infiltration is performed for a time period of 5 minutes.

5 . The method according to claim 1 , wherein in step 1, the mass ratio of the tannic acid to the anhydrous piperazine is 1:1.

6 . The method according to claim 1 , wherein in step 2, the organic phase solution of the trimesoyl chloride contains the trimesoyl chloride at a mass fraction of 0.1 wt %.

7 . The method according to claim 1 , wherein in step 2, the infiltration is performed for a time period of 1 minute.

8 . The method according to claim 1 , wherein in step 2, the organic phase solution contains a solvent selected from n-hexane or cyclohexane.

9 . A dye-salt separation membrane prepared by the method according to claim 1 .

10 . A dye-salt separation membrane prepared by the method according to claim 2 .

11 . A dye-salt separation membrane prepared by the method according to claim 3 .

12 . A dye-salt separation membrane prepared by the method according to claim 4 .

13 . A dye-salt separation membrane prepared by the method according to claim 5 .

14 . A dye-salt separation membrane prepared by the method according to claim 6 .

15 . A dye-salt separation membrane prepared by the method according to claim 7 .

16 . A dye-salt separation membrane prepared by the method according to claim 8 .

Assignees

• Univ Nanjing Sci & Tech

Inventors

• Li Jiansheng
• Li Qin
• Qi Junwen
• Fang Xiaofeng
• Liao Zhipeng
• Wang Dapeng
• Xie Jia
• Ni Linhan
• Sun Xiuyun
• Wang Lianjun

Classifications

• B01D69/1251 Primary

  by interfacial polymerisation · CPC title

• B01D67/0006

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

• B01D2323/12

  Specific ratios of components used · CPC title

• B01D61/027

  Nanofiltration · CPC title

• B01D71/56 Primary

  Polyamides, e.g. polyester-amides · CPC title