A reinforced separator for alkaline hydrolysis

Patent metadata

Field	Value
Publication number	US-2020181785-A1
Application number	US-201816628695-A
Country	US
Kind code	A1
Filing date	Jul 9, 2018
Priority date	Jul 10, 2017
Publication date	Jun 11, 2020
Grant date	—

Abstract

A reinforced separator for alkaline hydrolysis includes a porous support, a first porous polymer layer contiguous with one side of the support and a second porous polymer layer contiguous with the other side of the support, characterized in that the maximum pore diameter at the outer surface of the first porous polymer layer PDmax(1) and of the second porous polymer layer PDmax(2) are different from each other and wherein a ratio between PDmax(2) and PDmax(1) is between 1.25 and 10.

First claim

1 - 15 . (canceled)

16 : A reinforced separator for alkaline hydrolysis comprising:
a porous support; a first porous polymer layer contiguous with a first side of the porous support; and a second porous polymer layer contiguous with a second side of the porous support; wherein a maximum pore diameter PD max (1) at an outer surface of the first porous polymer layer and a maximum pore diameter PD max (2) at an outer surface of the second porous polymer layer are different from each other; and a ratio PDmax(2)/PDmax(1) is between 1.25 and 10.

17 : The reinforced separator according to claim 16 , wherein PDmax(1) is between 0.05 μm and 0.3 μm, and PDmax(2) is between 0.2 μm and 6.5 μm.

18 : The reinforced separator according to claim 16 , wherein the ratio PDmax(2)/PDmax(1) is between 2 and 7.5.

19 : The reinforced reinforced separator according to claim 16 , wherein each of the first porous polymer layer and the second porous polymer layer includes a membrane polymer and a hydrophilic inorganic material.

20 : The reinforced separator according to claim 19 , wherein the membrane polymer includes polysulfone or polyethersulfone.

21 : The reinforced separator according to claim 19 , wherein the hydrophilic inorganic material is selected from the group consisting of TiO 2 , BaSO 4 , and ZrO 2 .

22 : The reinforced separator according to claim 20 , wherein the hydrophilic inorganic material is selected from the group consisting of TiO 2 , BaSO 4 , and ZrO 2 .

23 : A method of preparing the reinforced separator according to claim 16 , the method comprising:
applying a dope solution including a membrane polymer, a hydrophilic inorganic material, and a solvent on the first side and on the second side of a porous support; and performing phase inversion on the dope solution applied to the first side of the porous support and the dope solution applied to the second side of the porous support to obtain a first porous polymer layer on the first side of the porous support and a second porous polymer layer on the second side of the porous support.

24 : The method according to claim 23 , wherein the solvent in the dope solution is selected from the group consisting of N-methyl-2-pyrrolidone, N-ethyl-pyrrolidone, N,N-dimethyl-formamide, formamide, dimethylsulfoxide, N,N-dimethylacetamide, acetonitrile, and mixtures thereof.

25 : The method according to claim 23 , wherein the dope solution further includes polyvinylpyrrolidone or glycerol.

26 : The method according to claim 23 , wherein the dope solution applied to the first side of the porous support is different from the dope solution applied to the second side of the porous support.

27 : The method according to claim 23 , wherein the step of performing phase inversion on the dope solution applied to the first side of the porous support is different from the step of performing phase inversion on the dope solution applied to the second side of the porous support.

28 : The method according to claim 23 , wherein the step of performing phase inversion includes performing Vapour Induced Phase Separation and Liquid Induced Phase Inversion.

29 : The method according to claim 28 , wherein the step of performing Vapour Induced Phase Separation on the dope solution applied to the first side of the porous support is different from the step of performing Vapour Induced Phase Separation on the dope solution applied to the second side of the porous support.

30 : The method according to claim 28 , wherein the step of performing Liquid Induced Phase Inversion is performed in a coagulation bath including water.

31 : The method according to claim 23 , further comprising:
transporting the porous support in a vertical position during the step of applying the dope solution and the step of performing phase inversion.

Assignees

• Agfa Gevaert Nv

Inventors

• Mues Willem

Classifications

• B01D67/0009

  by phase separation, sol-gel transition, evaporation or solvent quenching · CPC title

• B01D69/108

  Inorganic support material · CPC title

• B01D69/1071

  Woven, non-woven or net mesh · CPC title

• C25B13/02 Primary

  characterised by shape or form · CPC title

• C25B13/08

  based on organic materials · CPC title