Control of naphthenic acid corrosion with thiophosporus compounds
AssigneeBaker Hughes Incorporated
InventorMichael J. Zetlmeisl
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Abstract
Corrosion of iron-containing metal surfaces in a hydrocarbon fluid having a temperature of from about 175.degree. C. to about 400.degree. C. and containing a corrosive amount of naphthenic acid is inhibited by adding to the fluid or to a feed therefor, in a total additive amount sufficient to effect corrosion inhibition in said fluid, one or more thiophosphorus compound, a salt thereof, an alkyl or aryl ester thereof, an isomer thereof, or some combination of the foregoing, thereby to effect inhibition of naphthenic acid induced corrosion in the fluid.
Claims37
A method for inhibiting naphthenic acid corrosion of iron-containing metal surfaces in a non-aqueous hydrocarbon fluid having a temperature of from about 175.degree. C. to about 400.degree. C. and containing a corrosive amount of naphthenic acid, comprising adding to said fluid or to a feed therefor, in a total additive amount sufficient to effect corrosion inhibition in said fluid, at least one of the following types of compounds:
- a. thiophosphorus compounds of the formula ##STR11## wherein R' is selected from the group consisting of R.sup.3 (OCH.sub.2 CH.sub.2).sub.n - and R.sup.3 (OCH.sub.2 CH.sub.2).sub.n O--, R" is selected from the group consisting of R.sup.3 (OCH.sub.2 CH.sub.2).sub.n - and R.sup.3 (OCH.sub.2 CH.sub.2).sub.n O--, and --XH, wherein each X is independently selected from the group consisting of sulfur and oxygen, provided however that at least one X is sulfur, R.sup.3 is an alkyl group of about 6 to about 18 carbon atoms and n is an integer from 1 to about 12,
- b. salts of said thiophosphorus compounds,
- c. alkyl and aryl esters of said thiophosphorus compounds, and
- d. isomers of said thiophosphorus compounds, thereby to effect inhibition of naphthenic acid induced corrosion in said fluid.
Dependencies are inferred from the claim text.