看看以下一句话,一句就一段了,看不出主语谓语的,难? A method of separating an alkylpyridine containing at least one alkyl group having at least two carbon atoms and a total of not over ten carbon atoms in side chains from admixture with an alkenylpyridine containing at least one alkenyl group having at least two carbon atoms and a total of not over ten carbon atoms in side chains, said alkenylpyridine having the double bond on an alpha carbon atom which comprises flowing same in intimate countercurrent contact with an acidic aqueous solution having a pH less than 7 but not less than 2, recovering an aqueous phase enriched in said alkylpyridine and contacting same with a liquid hydrocarbon under conditions effecting transfer of said alkylpyridine from said aqueous phase to said hydrocarbon, subjecting resulting hydrocarbon solution to distillation to separate hydrocarbon from alkylpyridine product, returning a portion of said product to said countercurrent contacting at a point near the point of withdrawal of aqueous phase therefrom, and returning recovered hydrocarbon to the second mentioned contacting step. [ ]查看更多9个回答 . 3人已关注