Fouling resistant membranes for water treatment

Patent metadata

Field	Value
Publication number	US-2015265977-A1
Application number	US-201414221892-A
Country	US
Kind code	A1
Filing date	Mar 21, 2014
Priority date	Mar 21, 2014
Publication date	Sep 24, 2015
Grant date	—

Abstract

Methods for treating water containing dissolved solids, suspended solids, organic material, or combinations include contacting the water with a coated membrane comprising a coating material disposed on a membrane substrate, the coating material comprising structural units derived from a compound of formula I, a compound of formula II and a compound of formula III;

wherein
R 1 , R 2 , and R 3 are, independently at each occurrence, C 1 -C 12 alkyl;
R 4 is alkylsilyl;
L 1 is alkylurethanyl;
L 2 and L 3 are, independently at each occurrence, alkyl;
X is hydroxy, alkoxy, or alkylamino; and
m, n, and p, independently at each occurrence, range between 4 and 9.

The coated membrane is joined to a backing in membrane filtration apparatuses for use in the methods.

First claim

1 . A method for treating water containing dissolved solids, suspended solids, organic material, or a combination thereof, the method comprising contacting the water with a coated membrane comprising a coating material disposed on a membrane substrate, the coating material comprising structural units derived from a compound of formula I, a compound of formula II and a compound of formula III;

wherein
R 1 , R 2 , and R 3 are, independently at each occurrence, C 1 -C 12 alkyl;
R 4 is alkylsilyl;
L 1 is alkylurethanyl;
L 2 and L 3 are, independently at each occurrence, alkyl;
X is hydroxy, alkoxy, or alkylamino; and
m, n, and p, independently at each occurrence, range between 4 and 9.

2 . A method according to claim 1 , wherein R 1 and R 2 are ethyl.

3 . A method according to claim 1 , wherein L 1 is alkylurethanyl.

4 . A method according to claim 1 , wherein L 2 and L 3 are C 2 -C 3 alkyl.

5 . A method according to claim 1 , wherein R 4 is Si(R 5 ) 3 and R 5 is C 1 -C 4 alkyl.

6 . A method according to claim 1 , wherein
R 1 and R 2 are ethyl; and L 2 and L 3 are C 2 -C 3 alkyl.

7 . A method according to claim 1 , wherein the compound of formula I is

8 . A method according to claim 1 , wherein the compound of formula II is

9 . A method according to claim 1 , wherein the compound of formula III is

10 . A method according to claim 1 , wherein about 50-80% of the structural units are derived from a compound of formula I.

11 . A method according to claim 1 , wherein about 10-30% of the structural units are derived from a compound of formula II.

12 . A method according to claim 1 , wherein about 5-15% of the structural units are derived from a compound of formula III.

13 . A method according to claim 1 , wherein the membrane substrate is e-PTFE.

14 . A method according to claim 1 , additionally comprising combining the water with a water dispersable polymer before contacting the coated membrane with the water.

15 . A method according to claim 14 , wherein the water dispersable polymer is selected from coagulants, anionic flocculants, cationic flocculants, nonionic flocculants, and combinations thereof.

16 . A membrane filtration apparatus comprising a coated membrane joined to a backing, the coated membrane comprising a coating material disposed on a membrane substrate, the coating material comprising structural units derived from a compound of formula I, a compound of formula II and a compound of formula III;

wherein
R 1 , R 2 , and R 3 are, independently at each occurrence, C 1 -C 12 alkyl;
R 4 is alkylsilyl;
L 1 is alkylurethanyl;
L 2 and L 3 are, independently at each occurrence, alkyl;
X is hydroxy, alkoxy, or alkylamino; and
m, n, and p, independently at each occurrence, range between 4 and 9.

17 . A membrane filtration apparatus according to claim 16 , wherein

18 . A membrane filtration apparatus according to claim 16 , wherein R 1 and R 2 are ethyl.

19 . A membrane filtration apparatus according to claim 16 , wherein L 1 is alkylurethanyl.

20 . A membrane filtration apparatus according to claim 16 , wherein L 2 and L 3 are C 2 -C 3 alkyl.

21 . A membrane filtration apparatus according to claim 16 , wherein R 4 is Si(R 5 ) 3 and R 5 is C 1 -C 4 alkyl.

22 . A membrane filtration apparatus according to claim 16 , wherein
R 1 and R 2 are ethyl; and L 2 and L 3 are C 2 -C 3 alkyl.

23 . A membrane filtration apparatus according to claim 16 , wherein the compound of formula I is

the compound of formula II is

and
the compound of formula III is

24 . A membrane filtration apparatus according to claim 16 , wherein about 50-80% of the structural units are derived from a compound of formula I, about 10-30% of the structural units are derived from a compound of formula II, and about 5-15% of the structural units are derived from a compound of formula III.

25 . A membrane filtration apparatus according to claim 16 , wherein the membrane substrate is e-PTFE.

26 . A method for treating water containing dissolved solids, suspended solids, organic material, or a combination thereof, the method comprising contacting the water with a coated membrane comprising a coating material disposed on a membrane substrate, the coating material comprising structural units derived from a compound of formula IV, a compound of formula V and a compound of formula VI

wherein
R 9 is independently at each occurrence a hydrogen, or a linear or branched C 1 -C 4 alkyl group;
R 10 is a linear or branched C 1 -C 30 fluoroalkyl group;
R 11 and R 12 are independently at each occurrence a linear or branched C 1 -C 12 alkyl group; a C 5 -C 12 carbocyclic group, or a C 5 -C 12 heterocyclic group, and R 6 and R 7 are independently at each occurrence a linear or branched C 1 -C 12 alkylene group, a linear or branched C 2 -C 12 alkenylene group, a linear or branched C 2 -C 12 alkylnlene group, a C 5 -C 12 carbocyclic group, or a C 5 -C 12 heterocyclic group, or at least two of R 11 , R 12 , R 6 , and R 7 together with the nitrogen atom to which they are attached form a heterocyclic ring containing 5 to 7 atoms;
Y is an anionic group; and
m and n are independently at each occurrence an integer ranging from 1 to 5.

Assignees

• Gen Electric

Inventors

• Carr Louisa Ruth
• Dong Hongchen
• Smigelski Jr Paul Michael
• Davis Jason Louis
• Nichols Jason Michael

Classifications

• B01D67/0088

  Physical treatment with compounds, e.g. swelling, coating or impregnation · CPC title

• C02F1/444

  by ultrafiltration or microfiltration · CPC title

• C02F2101/32

  Hydrocarbons, e.g. oil · CPC title

• B01D71/36

  Polytetrafluoroethylene · CPC title

• B01D2323/26

  Spraying processes · CPC title