Composite silicone membranes of high separation efficiency

Patent metadata

Field	Value
Publication number	US-9539549-B2
Application number	US-201013513225-A
Country	US
Kind code	B2
Filing date	Nov 2, 2010
Priority date	Dec 1, 2009
Publication date	Jan 10, 2017
Grant date	Jan 10, 2017

Abstract

Composite membrane having a separating membrane layer characterized in that a separating membrane layer is produced by curing laterally modified silicone acrylates of the general Formula I

First claim

The invention claimed is:

1. A composite membrane, comprising: a separating membrane layer and a support membrane,
wherein the separating membrane layer comprises a cured mixture of silicone acrylates, the mixture comprising:
from 70 to 90% by weight of a component (A); and
from 10 to 30% by weight of a component (B);
wherein
component (A) is at least one silicone acrylate of Formula I, having a silicon content of on average greater than 29% by weight,

wherein,
a is from 25 to 500,
b is 0,
c is from 0 to 20, and
each R 2 =R 3 , and
component (B) is at least one silicone acrylate of Formula I, having a silicon content of less than 27.5% by weight, wherein,
a is from 1 to 24,
b is from 3 to 25,
c is from 0 to 20, and
each R 2 is R 1 or R 4 ,
each R 1 is independently an alkyl or aryl radical having from 1 to 30 carbon atoms, optionally comprising an ether group, an ester group, an epoxy group, an alcohol group, or a combination thereof,
each R 3 is independently an organic radical comprising one or more acrylate groups, and
each R 4 is independently a polyether radical.

2. The composite membrane of claim 1 ,
wherein R 3 is of Formula II or III:

d is from 0 to 12,
e is 0 or 1,
f is from 0 to 12,
g is from 0 to 2,
h is from 1 to 3,
g+h=3,
each R 6 is H or an alkyl or aryl radical having 1 to 30 carbon atoms,
each R 7 is a hydrocarbon radical.

3. The composite membrane of claim 1 ,
wherein each R 4 is independently of Formula IV:
—(CH 2 ) i —O—(CH 2 CH 2 O) j —(CH 2 CH(CH 3 )O) k —(CH 2 CHR 8 O) l —R 9   Formula IV,

i is from 0 to 12,
j is from 0 to 50,
k is from 0 to 50,
l is from 0 to 50,
each R 8 independently an alkyl or aryl radical having from 2 to 30 carbon atoms,
each R 9 is independently H, an alkanoyl radical, or an alkyl or aryl radical having from 2 to 30 carbon atoms.

4. The composite silicone membrane of claim 1 , wherein a mass ratio of (A) to (B) is from 10:1 to 1:10.

5. The composite membrane of claim 1 ,
wherein said curing is with a photo-initiator by electromagnetic radiation having a wavelength less than 800 nm, by an electron beam, or by both.

6. The composite membrane of claim 1 ,
wherein the support membrane is at least one solvent persistent porous three-dimensional support structure selected from the group consisting of a nonwoven membrane, a micro-filtration membrane, an ultrafiltration membrane, and a separator.

7. The composite membrane of claim 1 ,
wherein the support membrane comprises at least one porous support material selected from the group consisting of polyacrylonitrile (PAN); polyimide (PI); polyether ether ketone (PEEK); polyvinylidene fluoride (PVDF); polyamide (PA); polyamide-imide (PAI); polyethersulfone (PES); polybenzimidazole (PBI); sulphonated polyether ketone (SPEEK); polyethylen (PE); polypropylen (PP); an inorganic porous material, ceramic membrane, or polymer ceramic membrane obtained from aluminium oxide, titanium dioxide, zirconium dioxide, silicon oxide, titanium nitrite, or a combination thereof; and mixtures, modifications or composites thereof.

8. A process for retaining dissolved molecules, comprising:
retaining dissolved molecules having a molecular weight of less than 2000 g/mol with the composite membrane of claim 1 ,
wherein a retain fraction rate of the retaining is at least 90% by weight.

9. The process of claim 8 ,
wherein the dissolved molecules are a homogeneous catalyst system to be separated from a reaction mixture, a triglyceride to be separated from a solvent having a molecular weight of less than 200 g/mol, an oligomer to be separated from a monomer solution, or a pharmaceutical active ingredient or precursor thereof to be separated from a reaction mixture or solution.

10. The process of claim 9 ,
wherein the dissolved molecules are to be separated from a hydrocarbon with 1 to 8 carbon atoms, an isomer or mixture thereof, or else CO 2 .

11. The process of claim 8 ,
wherein the retaining comprises separating off a molecular weight fraction of less than 1000 g/mol from a solution in n-heptane at 30° C., 30 bar pressure.

12. A process for producing the composite membrane of claim 1 , comprising:
coating a support membrane with the mixture of silicone acrylates, to obtain a coated support membrane, and subsequently
curing the coated support membrane by electromagnetic radiation, electron beam radiation, or both.

13. The composite membrane of claim 2 ,
wherein an R 7 group is —CR 6 2 -.

14. The composite membrane of claim 13 ,
wherein an R 7 group is —CH 2 -.

15. The composite membrane of claim 3 , wherein i is from 3 to 7.

16. The process of claim 12 , wherein curing the coated support membrane comprises curing by electromagnetic radiation having a wavelength less than 800 nm.

Assignees

• Haensel Rene
• Doehler Hardi
• Schwab Peter
• Seidensticker Peter
• Ferenz Michael
• Baumgarten Goetz
• Lazar Marina
• Ungerank Markus
• Evonik Degussa Gmbh

Inventors

• Haensel Rene
• Doehler Hardi
• Schwab Peter
• Seidensticker Peter
• Ferenz Michael
• Baumgarten Goetz
• Lazar Marina
• Ungerank Markus

Classifications

• B01D67/009

  with wave-energy, particle-radiation or plasma · CPC title

• B01D71/70 Primary

  Polymers having silicon in the main chain, with or without sulfur, nitrogen, oxygen or carbon only · CPC title

• B01D69/12 Primary

  Composite membranes; Ultra-thin membranes · CPC title

• B01D2259/80

  Employing electric, magnetic, electromagnetic or wave energy, or particle radiation · CPC title