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US 5,853,619 AGranted
Low toxic corrosion inhibitor
AssigneeNalco/Exxon Energy Chemicals, L.P.
InventorsJames D. Watson, John G. Garcia, Jr.
Life of this patent
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Abstract
A low toxic corrosion inhibitor comprises (A) mercaptocarboxylic acid having from 2 to 6 carbon atoms, and (B) a polyamine/fatty acid/carboxylic acid adduct. The preferred combination of (A) and (B) includes mercaptoacetic acid and ethylenetetramine/tall oil acd/acrylic acid adduct.
Claims12
A method of inhibiting corrosion of a ferrous metal by a fluid encountered in petroleum operations, which comprises:
- (a) introducing into the fluid inhibiting amounts of a two-component corrosion inhibitor comprising (A) mercaptoacetic acid and (B) an amine derivative having the formula of ##STR12## Where n is an integer of 1 to 6;
- R is a C.sub.6-20 hydrocarbon group;
- R.sub.4 is an alkyl group having from 2 to 6 carbon atoms;
- R.sub.1 and R.sub.2 are independently (CH.sub.2).sub.p COOH groups where p is an integer of 1 to 4;
- and
- Y is selected from the group consisting of an amide having the formula of --CO--NH-- and an imidazoline group having the formula ##STR13##
3 more elements
Dependencies are inferred from the claim text.