Composition and method for inhibiting acid attack of metals

Claim 2

A composition according to claim 1 wherein said carboxylic acid is a fatty acid.

Claim 3

A composition according to claim 3 wherein said fatty acid is oleic acid.

Claim 4

A composition according to claim 1 wherein in said sulfonium salt each of said R1, R2, and R3 is aryl.

Claim 5

A composition according to claim 5 wherein said aryl is phenyl.

Claim 6

A composition according to claim 1 wherein said sulfonium salt is triphenyl sulfonium chloride.

Claim 7

A composition according to claim 1 including also another acid inhibitor, namely an acetylenic alcohol.

Claim 8

A composition consisting essentially of water, an acid of the type that tends to attack metallic surfaces and, in an amount at least sufficient to reduce said acid attack of said metallic surface, the acid inhibiting composition of claim 1. and wherein said acid which tends to attack said metallic surfaces is different from said fatty acid and said saturated dicarboxylic acid of said acid inhibiting composition.

Claim 9

A composition according to claim 9 wherein said acid inhibiting composition comprises about 0.05 weight percent to about 5 weight percent of the total weight of the composition.

Claim 10

A composition according to claim 10 wherein said acid inhibiting composition comprises about 0.5 weight percent to about 2 weight percent of the total weight of the composition.

Claim 11

A method for inhibiting acid attack of metallic surfaces comprising contacting a metallic surface with an acidic aqueous composition consisting essentially of an acid of the type that tends to attaCk metals which are contacted therewith and, in acid inhibiting amounts, the acid inhibiting composition of claim 2, wherein said acid which tends to attack said metals is different from said fatty acid and said saturated dicarboxylic acid of said acid inhibiting composition.

Claim 12

A method according to claim 12 wherein the nitrogenous organic compound of said acid inhibiting composition is said rosin amine derivative.

Claim 13

A method according to claim 12 wherein the carboxylic acid of said acid inhibiting composition is a fatty acid.

Claim 14

A method according to claim 12 wherein each of said R1, R2, and R3 in the sulfonium salt of said acid inhibiting composition is an aryl or aralkyl group.

Claim 15

An acid inhibiting composition for use in an acidic aqueous composition of the kind which tends to attack metallic surfaces which are contacted therewith consisting essentially of in weight percent: A. about 10 percent to about 85 percent of a nitrogenous organic compound which itself exhibits acid inhibiting properties when present in said type of acidic aqueous composition, said compound selected from the class consisting of: (1) a long chain alkyl amine having at least 10 carbon atoms; (2) a Mannich base prepared by the Mannich reaction, in the presence of acid, of formaldehyde with a ketone having at least 1 reactive hydrogen and an amine starting material of the formula wherein n is an integer ranging from 2 to about 20; R is selected from the group consisting of hydrogen and CH3(CH2)m 1 wherein m is an integer ranging from 1 to about 21; and Z is selected from the group consisting of hydrogen and the propylamine radical, said acid being present in an amount sufficient to maintain the pH of the reaction below 7, and wherein for each mole of said amine starting material there is utilized at least 1 mole of formaldehyde and 1 mole of ketone for each hydrogen atom attached to a nitrogen atom in the amine starting material; and (3) a rosin amine derivative of the formula: wherein R is a radical selected from the group consisting of abietyl, hydroabietyl and dehydroabietyl; Y is -CH2R1; X is selected from the group consisting of hydrogen and -CH2R1; and R1 represents an alpha ketonyl group; B. about 10 percent to about 70 percent of a fatty acid having at least six carbon atoms; and C. about 0.5 percent to about 40 percent of a sulfonium salt having the formula wherein R1, R2, and R3 are hydrocarbon radicals selected from the group consisting of alkyl having 1 to 12 carbon atoms, aryl and aralkyl, wherein at least one of said R1, R2, and R3 is aryl or aralkyl and wherein X is an acid anion.

Claim 16

A composition according to claim 16 wherein said fatty acid is oleic acid.

Claim 17

A composition according to claim 16 wherein said nitrogenous organic compound is a long chain alkyl amine having at least 10 carbon atoms.

Claim 18

A composition according to claim 16 wherein said sulfonium salt has three aryl groups.

Claim 19

A composition according to claim 19 wherein said sulfonium salt is triphenyl sulfonium chloride.

Claim 20

A composition according to claim 16 including also an antipitting agent, namely a mercapto alkanoic acid.

Claim 21

A composition according to claim 16 including also a nonionic surface active agent selected from the group consisting of ethoxylated secondary alcohols and ethoxylated nonyl phenols.

Claim 22

A composition according to claim 16 wherein said nitrogenous organic compound is said rosin amine derivative.

Claim 23

A composition according to claim 16 wherein said nitrogenous organic compound is said Mannich base.

Claim 24

In the process wherein aciD attack on a metallic surface by an acidic aqueous composition is reduced by incorporating in the composition an acid inhibitor, the improvement comprising utilizing as the acid inhibitor the acid inhibiting composition of claim 23, wherein said acid which tends to attack said metallic surface is different from said fatty acid and said saturated dicarboxylic acid of said acid inhibiting composition.

Claim 25

A process according to claim 25 wherein said acid comprises hydrochloric acid.

Claim 26

A process according to claim 25 wherein said metallic surface is a pipe utilized to convey said acidic aqueous composition in the acidizing of an oil well.

Claim 27

In the process wherein acid attack on a metallic surface by an acidic aqueous composition is reduced by incorporating in the composition an acid inhibitor, the improvement comprising utilizing as the acid inhibitor the acid inhibiting composition of claim 16, wherein said acid which tends to attack said metallic surface is different from said fatty acid of said acid inhibiting composition.

Claim 28

A process according to claim 28 wherein said acid comprises hydrochloric acid.

Claim 29

A process according to claim 29 wherein said metallic surface is a pipe utilized to convey said acidic aqueous composition in the acidizing of an oil well.