The method was established for purification of diflubenzuron by crystal technique with mixed solvents.

本文论述了利用混合溶剂——结晶法提纯除虫脲的分析技术。

The separation of three-component system of cyclohexane,cyclo-hexene and benzene by extract rectification with a mixed solvent,comprising hexyl dicyanide and dimethyl acetylamine has been studied.

选用己二腈-二甲基乙酰胺组成的混合溶剂，对环己烷、环己烯和苯组成的三元体系进行了萃取精馏。