Corrosion inhibitor for alkanolamine units
AssigneeBetzDearborn Inc.
InventorsLjiljana V. Minevski, Ann L. Lambousy
Life of this patent
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Abstract
The corrosion of metals in contact with an aqueous alkanolamine solution in an acid gas removal unit is inhibited by adding a corrosion inhibiting amount of an alkanemonothiol or alkanedithiol compound to the aqueous alkanolamine solution. The alkanemonothiol and alkanedithiol compounds are useful for inhibiting the corrosion of metals in both the acid gas rich and lean portions of the acid gas removal unit.
Claims9
A method for inhibiting corrosion of metals in contact with an aqueous alkanolamine solution comprising adding to the aqueous alkanolamine solution a corrosion inhibiting amount of a thiol compound, effective as a corrosion inhibitor, and having the formula:
- ##STR6## wherein x is 2-8;
- R.sub.1 is independently H, SH, C.sub.1 to C.sub.6 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.3 to C.sub.10 cycloalkyl, or C.sub.7 to C.sub.12 aralkyl;
- R.sub.2-7 are independently H, C.sub.1 to C.sub.6 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.3 to C.sub.10 cycloalkyl, or C.sub.7 to C.sub.12 aralkyl;
- and the total number of carbon atoms in the compound is less than seventeen.
A method for inhibiting corrosion of metals in contact with an aqueous alkanolamine solution in the lean portions of acid gas removal equipment, comprising adding to said aqueous alkanolamine solution a corrosion inhibiting amount of a thiol compound, effective as a corrosion inhibitor, and having the formula:
- ##STR7## wherein x is 2-8;
- R.sub.1 is independently H, SH, C.sub.1 to C.sub.6 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.3 to C.sub.10 cycloalkyl, or C.sub.7 to C.sub.12 aralkyl;
- R.sub.2-7 are independently H, C.sub.1 to C.sub.6 alkyl, C.sub.6 to C.sub.10 aryl, C.sub.3 to C.sub.10 cycloalkyl, or C.sub.7 to C.sub.12 aralkyl;
- and the total number of carbon atoms in the compound is less than seventeen.
Dependencies are inferred from the claim text.