Emulsion breaking process
View Patent ↗The invention pertains to the use of a class of acetylenic surfactants to resolve or break water and oil emulsions. The surfactants are of particular advantage in resolving crude oil emulsions of the type encountered in desalter and similar apparatus designed to extract brines from the crude as they partition to the aqueous phase in the desalter.
1. A method of resolving a crude oil containing emulsion that includes an oil phase and an aqueous phase comprising contacting said crude oil emulsion with an amount of between about 1 to 1,000 ppm of an acetylenic surfactant compound or compounds selected from the groups Ia and Ib, wherein said Group Ia has the formula
and wherein said Group Ib has the formula
wherein R is —(CH 2 —CH 2 )—; R 5 is —(CH 2 (CH 3 )CH)—or —(CH 2 —CH 2 —CH 2 )—; R 1 and R 4 are a straight or a branched chain alkyl having from about 3 to 10 C atoms or an aryl group; R 2 and R 3 are H, an alkyl chain having 1 to 5 C atoms or aryl group, and m, n, p, and q are numbers that range from about 0 to about 30, said method further comprising contacting said crude oil emulsion with another surfactant (II) wherein said surfactant (II) is a polyol having the formula
wherein the moieties x, y, and z are each at least 1 and are such as to provide the compound with a molecular weight of about 500 or higher.
2. Method as recited in claim 1 wherein said emulsion is formed in a desalting apparatus.
3. Method as recited in claim 1 wherein said emulsion is a bitumen emulsion.
4. Method as recited in claim 1 wherein said emulsion is a slop oil emulsion.
5. Method as recited in claim 1 wherein said emulsion comprises water, oil, and sand.
6. Method as recited in claim 1 wherein said emulsion is located in a heater treater apparatus, free water knockout apparatus, inclined plate separator apparatus, or a water separator apparatus.
7. Method as recited in claim 1 wherein said emulsion is located in hydrocyclone or centrifuge.
8. Method as recited in claim 1 wherein said emulsion is a drilling mud emulsion.
9. Method as recited in claim 8 wherein said drilling mud emulsion is an inverted slop oil drilling mud emulsion.
10. Method as recited in claim 8 wherein said drilling mud emulsion results from leakage of drilling mud into produced crude oil.
11. Method as recited in claim 1 wherein said emulsion is a refinery slop oil emulsion.
12. Method as recited in claim 1 wherein said surfactant compound or compounds are chosen from the group consisting of
a) 2, 4, 7, 9-tetramethyl-5-decyne-4,7-diol (TMDD-5) and
b) 2, 5, 8, 11-tetramethyl-6-dodecyne-5,8-diol (TMDD-6) and ethoxylates and propylene oxide derivations of a) and b).
13. Method as recited in claim 12 wherein said surfactant compound is a).
14. Method as recited in claim 12 wherein said surfactant compound is an ethoxylate or propylene oxide capped ethoxylate of a).
15. Method as recited in claim 1 wherein said additional surfactant (II) has a molecular weight of from about 500 to about 30,000.
16. Method as recited in claim 15 wherein said x and z moieties of said additional surfactant (II) comprise about 20%-80% by weight of said additional surfactant.
17. Method as recited in claim 16 wherein said x and z moieties comprise about 40 percent by weight of said additional surfactant and said additional surfactant has a molecular weight of about 4,000.
18. Method as recited in claim 1 wherein said surfactant Ia, Ib, and II is brought into contact with said emulsion in a combined amount of 1 to 1,000 ppm based upon one million parts of said emulsion, and wherein said surfactant Ia, Ib is present in an amount of about 1-90 wt % based on the total weight of La, Ib, and II.
19. A method of breaking a bitumen emulsion comprising contacting said bitumen emulsion with an effective amount of between about 1 about 500 ppm of an acetylenic surfactant compound or compounds selected from the groups Ia and Ib, wherein said Group Ia has the formula
and wherein said Group lb has the formula
wherein R is —(CH 2 —CH 2 )—; R 5 is —(CH 2 (CH 3 )CH)— or —(CH 2 CH 2 CH 2 )—; R 1 and R 4 are a straight or a branched chain alkyl having from about 3 to 10 C atoms or an aryl group; R 2 and R 3 are H, an alkyl chain having 1 to 5 C atoms or aryl group, and m, n, p, and q are numbers that range from about 0 to about 30, and an additional surfactant II comprising a polyol having the formula
wherein the moieties x, y, and z are each at least 1 and are such as to provide the compound with a molecular weight of about 500 or higher, said I and II in combination, being present in an amount of from about 1 to 1,000 ppm based upon one million parts of said emulsion.
20. Method as recited in claim 19 wherein said surfactant compound or compounds Ia or lb are chosen from the group consisting of
a) 2, 4, 7, 9-tetramethyl-5-decyne-4,7-diol (TMDD-5) and
b) 2, 5, 8, 11-tetramethyl-6-dodecyne-5,8-diol (TMDD-6) and ethoxylates and propylene oxide derivations of a) and b), and wherein said surfactant II has a molecular weight of from about 500 to about 30,000.
21. Method as recited in claim 20 wherein said x and z moieties of said additional surfactant (II) comprise about 20%-80% by weight of said additional surfactant.
22. Method as recited in claim 21 wherein said x and z moieties comprise about 40 percent by weight of said additional surfactant and said additional surfactant has a molecular weight of about 4,000.