| 摘要 |
PROBLEM TO BE SOLVED: To provide a purification method of N-alkyl piperazines, capable of providing high purity N-alkyl piperazines with low cost and having a high recovery rate.SOLUTION: A mixture of N-alkyl piperazines and a piperazine is distilled in the presence of a polar organic solvent having a higher boiling point than that of the piperazine. |
