Carboxy alkyl-ester anti-agglomerants for the control of natural gas hydrates
AssigneeChampionX USA Inc.
InventorsJeff Michael Servesko, Jeremy Wayne Bartels, Regan Andrew Jones, Corbin Metoyer
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Abstract
This disclosure relates to anti-agglomerant low dosage hydrate inhibitors that can inhibit the formation of hydrate agglomerants and/or plugs. Thus, provided herein are carboxy alkyl ester compounds that can be used in hydrate inhibitor compositions and methods of inhibiting formation of hydrate agglomerants in a fluid comprising water, a gas, and optionally a liquid hydrocarbon. Also provided herein are methods of making the carboxy alkyl ester compound.
Claims16
A compound having the structure of formula (Ia) or an acid, a free base, a zwitterion, or a salt thereof:
- wherein
- R1 is C10 to C24 alkyl or alkenyl or straight or branched C6-C24 alkyl and contains 1 to 12 ethylene oxide units;
- R5 is hydrogen;
- R2 is hydrogen;
- R4 is hydrogen;
- and
- R6 and R7 are independently alkyl or R6 and R7 together with the nitrogen they are attached to form a ring.
A compound having the structure of formula (Ie) or an acid, a free base, a zwitterion, or a salt thereof:
- wherein
- R1 is hydrogen;
- (ii) R5 is C10 to C24 alkyl or alkenyl or straight or branched C6-C24 alkyl and contains 1 to 12 ethylene oxide units;
- R4 is hydrogen;
- A is a nitrogen-containing heterocycle, wherein the nitrogen-containing heterocycle is an optionally substituted pyrrolidine, piperidine, pyrazolidine, imidazolidine, isoxazolidine, oxazolidine, or azepane.
A compound selected from the group consisting of:
Dependencies are inferred from the claim text.