Corrosion inhibiting compositions and methods
AssigneesNalco/Exxon Energy Chemicals, L.P., Halliburton Energy Services, Inc.
InventorsGrahame N. Taylor, Juanita M. Cassidy, Dennis A. Williams, Gary P. Funkhouser
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Abstract
Corrosion inhibiting compositions and methods for inhibiting the corrosion of metal surfaces by corrosive aqueous fluids are provided. In accordance with the invention, a corrosion inhibiting composition comprised of one or more aldehyde oligomers having the general formula are combined with the corrosive aqueous fluid.
Claims27
A composition for inhibiting the corrosion of metal surfaces by a corrosive aqueous fluid when the composition is added to the corrosive aqueous fluid comprising one or more aldehyde oligomers having the general formula:
- wherein:
- R1 is phenyl or a phenyl group substituted with one or more of the groups methyl, hydroxyl or methoxy,
- R2 and R3 are individually hydrogen, a saturated or unsaturated aliphatic group having from 1 to about 12 carbon atoms or an aryl group,
- R4 is hydrogen, —(NH—CH2—CH2—)m—NH—CH2CH2NH2 where m is 0 or an integer in the range of from 1 to 5 or a tris(2-aminoethyl) amine group,
- n is an integer in the range of from 3 to 7,
- X is oxygen, NH or with R4 and the carbon atom forms an imidazoline group, and
- said one or more aldehyde oligomers being formed by the condensation reaction of benzaldehyde and acetaldehyde in an aqueous catalyst solution.
A metal corrosion inhibited aqueous acid composition comprising:
- water;
- an acid selected from the group consisting of inorganic acids, organic acids and mixtures thereof present in an amount in the range of from about 1% to about 30% by weight of water in said composition;
- and
- at least one aldehyde oligomer having the general formula:
- wherein:
- R1 is phenyl or a phenyl group substituted with one or more of the groups methyl, hydroxyl or methoxy,
- R2 and R3 are individually hydrogen, a saturated or unsaturated aliphatic group having from 1 to about 12 carbon atoms or an aryl group,
- R4 is hydrogen, —(NH—CH2—CH2—)m—NH—CH2CH2NH2 where m is 0 or an integer in the range of from 1 to 5 or a tris(2-aminoethyl) amine group,
- n is an integer in the range of from 3 to 7,
- X is oxygen, NH or, with R4 and the carbon atom forms an imidazoline group, and
- said aldehyde oligomer being formed by the condensation reaction of benzaldehyde and acetaldehyde in an aqueous catalyst solution and being present in an amount in the range of from about 0.01% to about 2% by weight of water in said composition.
A method of inhibiting the corrosion of metal surfaces by a corrosive aqueous fluid comprising combining a corrosion inhibiting composition with said corrosive aqueous fluid, said corrosion inhibiting composition being comprised of one or more aldehyde oligomers having the formula
- wherein:
- R1 is phenyl or a phenyl group substituted with one or more of the groups methyl, hydroxyl or methoxy,
- R2 and R3 are individually hydrogen, a saturated or unsaturated aliphatic group having from 1 to about 12 carbon atoms or an aryl group,
- R4 is hydrogen, —(NH—CH2—CH2—)m—NH—CH2CH2NH2 where m is 0 or an integer in the range of from 1 to 5 or a tris(2-aminoethyl) amine group,
- n is an integer in the range of from 3 to 7,
- X is oxygen, NH or with R4 and the carbon atom forms an imidazoline group, and
- said one or more aldehyde oligomers being formed by the condensation reaction of benzaldehyde and acetaldehyde in an aqueous catalyst solution.
Dependencies are inferred from the claim text.