Corrosion inhibitors with low environmental toxicity
AssigneeChampion Technologies, Inc.
InventorsAli Naraghi, Nihal U. Obeyesekere
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Abstract
A low toxic, biodegradable, water soluble and dispersant series of corrosion inhibitors are described. The method of inhibiting corrosion in aqueous medium by incorporating the inhibitor in PPM is provided. The corrosion inhibitor compromises an acrylic acid and chloroacetic acid adduct of 2-substituted imidazolines or primary, secondary or tertiary amines with carbon chain of twelve to twenty-two saturated or unsaturated carbon atoms. The molar ratio of acrylic acid to chloroacetic acid was methodically changed while keeping the concentration of imidazoline or the amine a constant. The product is made water soluble by raising the pH to 8-9 at the end of the synthesis by adding aqueous sodium hydroxide.
Claims24
A method of inhibiting corrosion of metal process equipment in a oil field corrosive environment comprising the step of introducing a corrosion inhibiting mixture in an effective amount and consisting essentially of the reaction product of alkyl amine, aryl amine, or polyethyl amine with a fatty acid and subsequently reacted with halocarboxylic acid and an unsaturated carboxylic acid or salts thereof to obtain substitution of substantially all reactive hydrogen atoms attached to a nitrogen atom.
A low toxicity corrosion inhibitor which is provided by any of the following formulas or mixtures thereof and comprising:
- R—X(C2H4NZ)nC2H4NZ2;
- (a)
- or
- Z2N(CH2)mNZ2;
- (b)
- or
- R—NZ2;
- (c)
- where
- (i) R=C18 to a C36 hydrocarbon or aryl saturated or unsaturated ring;
- (ii) X=amide (—CO—NH—) or a 5-membered cyclic imidazoline ring;
- (iii) Z=salts of unsaturated carboxylic acid and halocarboxylic acid;
- (iv) n=an integer from 1 to 6;
- and
- (v) m=an integer from 18 to 36.
A low toxicity composition for inhibiting metal corrosion exposed to flowing oil field fluids when the composition comprises a reaction product of a selected amine with a C18 to C36 fatty acid and subsequently reacted to convert any reactive hydrogen atoms attached to nitrogen atoms therein resulting in a low toxicity corrosion inhibitor having reduced reactive hydrogen atoms.
A method of making a corrosion inhibitor comprising the steps of:
- (a) forming a reaction product of alkyl amine, aryl amine, polyethyl amine or mixtures thereof with a fatty acid;
- and
- (b) subsequently reacting the product of step (a) with a halocarboxylic acid and a carboxylic acid or salts thereof to obtain substitution of substantially all reactive hydrogen atoms attached to nitrogen atoms, thereby obtaining a reduced toxicity corrosion inhibitor.
Dependencies are inferred from the claim text.