| abstract |
The present invention relates to a method for obtaining high-purity ethyleneimine. The steps are as follows: (1) adding an aqueous alkali metal hydroxide solution to the crude ethyleneimine containing monoethanolamine and ethylamine impurities, and heating at a temperature of 10-30° C. Under the conditions, stir evenly to obtain a mixed solution; (2) add aromatic sulfonyl chloride to the mixed solution, until the precipitation that occurs in the mixed solution is no longer dissolved; (3) the mixed solution is distilled, and fractions are collected to obtain high-purity ethylene. imine products. The method of the invention utilizes the huge difference in the reaction phenomenon of primary amine, secondary amine and aromatic sulfonyl chloride, realizes the efficient separation of ethyleneimine and impurity primary amine, obtains high-purity ethyleneimine product with a content of more than 99.9%, and the raw materials are cheap Easy to obtain, mild reaction conditions and simple operation process. |