| abstract |
The corrosion of metals in contact with aqueous alkanolamine solution in acid gas removal units is inhibited by maintaining in the alkanolamine solution a corrosion inhibiting amount of a compound having formula (I) where R is S or O, and R1, R2, R3 and R4 are independently H, C1 to C8 alkyl, C1 to C8 alkenyl, C6 to C10 aryl, C7 to C12 alkaryl, C7 to C12 aralkyl, C3 to C10 cycloalkyl, C1 to C8 thiophene, or amino groups. The alkanedithiol is useful for inhibiting the corrosion of metals in both the acid gas rich and lean portions of the acid gas removal unit. |