| 摘要 |
A process for the purification of tertiary amines in a crude mixture contaminated with undesirable primary and secondary amines which may have only a slight variance in boiling point with respect to the tertiary amine, wherein the crude mixture of the tertiary amine is treated at temperatures which may range from 0 DEG to 200 DEG C. but preferably from 20 to 150 DEG C. and at pressures of from 1 to 200 bar but most preferably under atmospheric pressure with a carboxylate of the formula <IMAGE> II in which R4 and R5 are selected from the group consisting of C1-C20-alkyl, C3-C12-cycloalkyl, C4-C20-cycloalkylalkyl, and aryl or C7-C20-aralkyl, both optionally mono- to penta- substituted by C1-C8-alkyl, C3-C8-cycloalkyl, or C4-C12-cycloalkylalkyl, and R4 may also represent hydrogen, to selectively form the alkylamides of the primary and secondary amine contaminants; and then separating the alkylamides from the tertiary amine by distillation.
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