Method of removing volatile compounds from emulsions

Patent metadata

Field	Value
Publication number	US-10537853-B2
Application number	US-201615741931-A
Country	US
Kind code	B2
Filing date	Sep 23, 2016
Priority date	Sep 24, 2015
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

Various embodiments disclosed relate to methods of separating volatile compounds from a liquid feed mixture comprising an emulsion. In various embodiments, the method includes contacting a first side of a first membrane with a liquid feed mixture including an emulsion having a polymer, and at least one volatile compound. The method can also include contacting a second side of the first membrane with a sweep medium including at least one a sweep fluid to produce a permeate mixture on the second side of the first membrane and a retentate mixture on the first side of the first membrane, wherein the permeate mixture is enriched in the volatile compound, and the retentate mixture is depleted in the volatile compound.

First claim

What is claimed is:

1. A method of separating a volatile compound from
a liquid feed mixture comprising an emulsion, the method comprising:
contacting a first side of a first membrane with the liquid feed mixture comprising the emulsion having at least one volatile compound; and
contacting a second side of the first membrane with a sweep medium comprising a sweep liquid, to produce a permeate mixture on the second side of the first membrane and a retentate mixture comprising the emulsion on the first side of the first membrane, wherein the permeate mixture is enriched in the volatile compound, and the retentate mixture is depleted in the volatile compound, wherein the sweep liquid comprises an organosilicon liquid, and
wherein the volatile compound comprises a volatile organic compound, a volatile inorganic compound, a volatile siloxane, a volatile linear siloxane, and/or a volatile cyclosiloxane.

2. The method of claim 1 , wherein the emulsion further comprises a polymer selected from an organic polymer or organopolysiloxane polymer.

3. The method of claim 1 , including one of more of limitations a) through h):
a) wherein the retentate mixture is depleted in the volatile compound by 1 wt % to 99.99 wt %, as compared to the liquid feed mixture,
b) wherein the first membrane is hydrophobic,
c) wherein the first membrane is nonporous,
d) wherein the first membrane is a dense silicone membrane,
e) wherein the first membrane has a thickness of about 0.01 μm to about 300 μm,
f) wherein the first membrane is an unsupported membrane,
g) wherein the first membrane is a hollow fiber membrane module comprising a bundle of hollow fibers, wherein each of the fibers has a bore-side and a shell-side, wherein at least one of
the first side of the hollow fiber membrane is the bore-side and the second side of the hollow fiber membrane is the shell-side, and
the first side of the hollow fiber membrane is the shell-side and the second side of the hollow fiber membrane is the bore-side,
h) wherein the organosilicon sweep liquid comprising comprises at least one of an organosiloxane, an organopolysiloxane or an organosilane.

4. The method of claim 3 , including limitation h) wherein the organosilicon fluid of limitation h) comprises at least one silicon-bonded group chosen from a substituted or unsubstituted (C 1 -C 20 )hydrocarbyl interrupted or terminated with 0, 1, 2, or 3 groups selected from —O—, —NH—, and —S—, substituted or unsubstituted (C 1 -C 20 )alkyl, substituted or unsubstituted (C 6 -C 20 )aryl, and a substituted or unsubstituted polyether.

5. The method of claim 1 , further comprising desorbing the volatile compound from the permeate mixture and recirculating the desorbed permeate mixture into contact with the second side of the first membrane.

6. A method of separating a volatile compound from a liquid feed mixture comprising an emulsion, the method comprising:
contacting a first side of a first membrane with the liquid feed mixture comprising the emulsion having a polymer and the volatile compound wherein the polymer is an organopolysiloxane polymer, the volatile compound is a volatile siloxane or both; and
contacting a second side of the first membrane with a sweep medium comprising a sweep liquid which comprises at least one of an organosiloxane, an organopolysiloxane, and organosilane, to produce a permeate mixture on the second side of the first membrane and a retentate mixture comprising the emulsion on the first side of the first membrane, wherein the permeate mixture is enriched in the volatile siloxane, and the retentate mixture is depleted in the volatile siloxane.

7. The method of claim 6 , wherein the volatile siloxane comprises at least one of a cyclosiloxane and a linear siloxane.

8. The method of claim 7 , wherein the cyclosiloxane is a substituted or unsubstituted cyclosiloxane having about 3 to 20 —Si—O— units in the ring or rings thereof.

9. The method of claim 6 , including one of more of limitations a) through h):
a) wherein the retentate mixture is depleted in the volatile compound by 1 wt % to 99.99 wt %, as compared to the liquid feed mixture,
b) wherein the first membrane is hydrophobic,
c) wherein the first membrane is nonporous,
d) wherein the first membrane has a thickness of about 0.01 μm to about 300 μm,
e) wherein the first membrane is an unsupported membrane,
f) wherein the first membrane is a hollow fiber membrane module comprising a bundle of hollow fibers, wherein each of the fibers has a bore-side and a shell-side, wherein at least one of
the first side of the hollow fiber membrane is the bore-side and the second side of the hollow fiber membrane is the shell-side, and
the first side of the hollow fiber membrane is the shell-side and the second side of the hollow fiber membrane is the bore-side.

10. A method of separating a volatile compound from a liquid feed mixture comprising an emulsion, the method comprising:
contacting a first side of a first membrane with a liquid feed mixture comprising an emulsion having a polymer, and at least one volatile compound, wherein the volatile compound comprises a volatile organic compound, a volatile inorganic compound, a volatile siloxane, a volatile linear siloxane, and/or a volatile cyclosiloxane, the first membrane comprises a dense silicone membrane having a thickness of about 1 μm to about 300 μm, and the emulsion has a temperature of about 20° C. to about 120° C.; and
contacting a second side of the membrane with a sweep medium comprising a sweep liquid, wherein the sweep liquid comprises an organosilicon liquid, to produce a permeate mixture on the second side of the first membrane and a retentate mixture comprising the emulsion on the first side of the membrane, wherein the permeate mixture is enriched in the volatile compound, and the retentate mixture is depleted in the volatile compound by 1 wt % to about 99.99 wt %, as compared to the liquid feed mixture.

11. The method of claim 10 , including one or both of the following limitations i) and j):
i) wherein the volatile compound comprises a volatile siloxane and the polymer comprises an organopolysiloxane,
j) wherein the first membrane is hydrophobic.

12. A system for separating a volatile compound from a liquid mixture comprising an emulsion, the system comprising:
a first membrane;
a liquid feed mixture comprising an emulsion having a polymer, and at least one volatile compound, the liquid feed mixture contacting a first side of the first membrane;
a sweep medium comprising at least one sweep liquid, the sweep medium contacting a second side of the first membrane to form
a permeate mixture on the second side of the first membrane, wherein the permeate mixture is enriched in the volatile compound and
a retentate mixture on the first side of the first membrane, wherein the retentate mixture is depleted in the volatile compound,
wherein the sweep liquid comprises an organosilicon liquid, the polymer is an organopolysiloxane polymer, and the volatile compound comprises a volatile organic compound, a volatile inorganic compound, and/or a volatile siloxane.

13. The system of claim 12 , including one or more of the following limitation k) through m):
k) wherein the volatile compound comprises a volatile siloxane,
i) wherein the first membrane is hydrophobic,
m) further comprising a desorber wherein the volatile compound from the permeate mixture is removed and the desorbed permeate mixture is recirculated into contact with the second side of the first membrane.

Assignees

• Dow Corning
• Dow Silicones Corp

Inventors

• Ahn Dongchan
• Greiner Aaron
• Keinath Mark
• Thompson James

Classifications

• B01D2311/04

  Specific process operations in the feed stream; Feed pretreatment · CPC title

• B01D2311/13

  Use of sweep gas · CPC title

• B01D69/02

  characterised by their properties · CPC title

• B01D2311/06

  Specific process operations in the permeate stream · CPC title

• C08J2383/04

  Polysiloxanes · CPC title