Siloxane cross-linked demulsifiers
View Patent ↗A composition comprising one or more siloxane cross-linked demulsifiers wherein said siloxane cross-linked demulsifiers are prepared by reacting one or more alkylphenol-formaldehyde resin alkoxylates, one or more polyalkylene glycols, or a mixture thereof, with up to about 1.0 molar equivalents of one or more silicon-based cross-linkers of formula R 1 R 2 R 3 R 4 Si wherein R 1 , R 2 , R 3 , R 5 , R 6 and R 7 are independently selected from H, Cl, C 1 -C 4 alkyl and C 1 -C 4 alkoxy; R 4 . is selected from H, Cl, C 1 -C 4 alkyl, C 1 -C 4 alkoxy and a group of formula L 1 SiR 5 R 6 R 7 ; L 1 is absent or is selected from —O—, arylene and C 1 -C 12 alkylene, optionally interrupted by one or more —O— or —N(R 8 )—; and R 8 is H or C 1 -C 4 alkyl and a method of using the demulsifier composition to resolve water-in-oil emulsions.
1. A composition comprising one or more siloxane cross-linked demulsifiers, wherein said siloxane cross-linked demulsifiers are prepared by reacting one or more alkylphenol-formaldehyde resin alkoxylates that is the reaction product of one or more alkylphenol-formaldehyde resins and 20 to about 500 molar equivalents of one or more alkylene oxides, one or more polyalkylene glycols, or a mixture thereof, with about 0.01 to about 0.5 molar equivalents of one or more silicon-based cross-linkers selected from compounds of formula: Si(OCH 2 CH 3 ) 4 , Si(OCH 3 ) 4 , and (CH 3 CH 2 O) 3 Si—(CH 2 ) 3 —NH—(CH 2 ) 3 —Si(OCH 2 CH 3 ) 3 .
2. The composition of claim 1 wherein the alkylphenol-formaldehyde resin alkoxylate is selected from the group consisting of nonylphenol-formaldehyde resin alkoxylate, butylphenol-formaldehyde resin alkoxylate, amylphenol-formaldehyde resin alkoxylate and dodecylphenol-formaldehyde resin alkoxylate and mixtures thereof.
3. The composition of claim 1 wherein the polyalkylene glycol is selected from the group consisting of: one or more polyethylene glycol reaction products of one or more C 2 -C 12 glycols and ethylene oxide, one or more polypropylene glycol reaction products of one or more C 2 -C 12 glycols and propylene oxide, one or more polyethylene/polypropylene block copolymer reaction products of C 2 -C 12 glycols and ethylene/propylene oxides, and one or more polyethylene/polypropylene mixed copolymer reaction products of C 2 -C 12 glycols and ethylene/propylene oxides.
4. The composition of claim 3 wherein the alkylphenol-formaldehyde resin alkoxylate is nonylphenol-formaldehyde resin alkoxylate.
5. The composition of claim 1 wherein the polyalkylene glycol is dipropylene glycol base polyalkylene glycol.
6. The composition of claim 1 wherein the alkylphenol-formaldehyde resin alkoxylates are further cross-linked with bisphenol A epichlorohydrin.
7. A method of resolving a water-in-oil emulsion comprising adding to the emulsion an effective demulsifying amount of the composition of claim 1 .
8. The method of claim 7 wherein the water-in-oil emulsion is a crude oil emulsion.