| 摘要 |
A method of purifying 2-cyano-para-phenylenediamine according to the present invention is characterized by inserting 2-cyano-para-phenylenediamine into a distillation column and purifying the product to have 0.5-4 of reflux ratio under the condition having temperature of the bottom of the column is 150-250°C and temperature of the top of the column is 150-230°C. The present invention easily controls the purification of 2-cyano-para-phenylenediamine and has high yield of purified 2-cyano-para-phenylenediamine whereby mass-production is enabled. Further, the product obtained is purified 2-cyano-para-phenylenediamine having purity more than or equal to 97% which exhibits light beige or bright yellow colors based on high purification efficiency. |
