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US 2023/0332037 A1Published application
Polyanionic surfactants and methods of making and using thereof
AssigneeChevron U.S.A. Inc.
InventorsGayani W. PINNAWALA, Sujeewa S. PALAYANGODA, Gregory A. WINSLOW, Varadarajan DWARAKANATH
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Abstract
The present disclosure is directed to polyanionic surfactants, surfactant mixtures, compositions derived thereof, and uses thereof such as in oil and gas operations. Methods of making polyanionic surfactants are also described.
Claims36
A surfactant defined by Formula I below
- or a salt thereof, wherein
- HG represents a head group comprising from 1-3 carboxylate moieties;
- R1 represents a C7-C32 alkyl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, a C7-C32 alkylaryl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, a C7-C32 alkenyl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy, or a C7-C32 alkenylaryl group substituted with from one to three sulfonate moieties and optionally with from one to three substituents selected from hydroxy and alkoxy;
- n is an integer from 1 to 8;
- AO represents, individually for each occurrence, an alkyleneoxy group selected from an ethoxy group, a propoxy group, or a butoxy group;
- and
- w is an integer from 1 to 110.
4 more elements
A surfactant mixture comprising:
- (a) a first surfactant defined by Formula II or a salt thereof;
- and
- (b) a second surfactant defined by Formula III or a salt thereof;
- wherein
- one of D1 and D2 is a sulfonate group and one of D1 and D2 is hydrogen;
- one of E1 and E2 is a sulfonate group and one of E1 and E2 is hydroxy;
- e is an integer from 0 to 32 and f is an integer from 0 to 32, with the proviso that the sum of e and f is from 4 to 32;
- AO represents, individually for each occurrence, an alkyleneoxy group selected from an ethoxy group, a propoxy group, or a butoxy group;
- w is an integer from 1 to 110;
- and
- p is an integer from 1 to 5.
8 more elements
A method of making a polyanionic surfactant, the method comprising:
- alkoxylating an unsaturated alcohol having from 8 to 36 carbons to form an alkyleneoxy-tipped unsaturated alcohol;
- reacting the alkyleneoxy-tipped unsaturated alcohol to form an unsaturated alkoxylated carboxylate;
- and
- sulfonating the unsaturated alkoxylated carboxylate to form the polyanionic surfactant.
1 more element
Dependencies are inferred from the claim text.