| 摘要 |
Prepn. of alcohols (I) by catalytic transesterification, where (I) has a higher b.pt. than the reactant alcohol (Ia) (and opt. than the ester components), comprises supplying the feed ester, excess (Ia) and catalyst to the upper part of a distillation column, then recovering reaction prods. from the bottom or top of the column. Pref. where the catalyst is a solid it may be used as column packing. The method is esp. for making diols from corresp. esters by reaction with 1-3C monovalent alcohols, specifically prodn. of 1,4-butanediol or 1,4-butenediol from corresp. acetates and methanol. Process can be operated continuously. |
