A process for making a cyclic compounds such as cyclic acetal or cyclic ketones by feeding aldehyde or ketone compounds and polyhydroxyl compounds to a reaction zone at a molar ratio of polyhydroxyl compounds to aldehyde or ketone compounds of at least 3:1, reacting these compounds in the presence of a solid acid such as an acidic ion exchange resin, to generate a liquid reaction mixture without separating water from the reaction mixture as it is being formed in the reaction mixture, withdrawing the liquid reaction mixture from the reaction zone as a liquid product stream, and feeding the liquid reaction product stream to a distillation column to separate cyclic acetal compounds from unreacted polyhydroxyl compounds, and optionally recycling back the unreacted polyhydroxyl compounds to the reaction zone. The process produces cyclic acetal compounds in yields of at least 90% with long catalyst life. The process is also suitable to make cyclic ketals from ketone compounds.
通过将醛或酮化合物和多羟基化合物以多羟基化合物与醛或酮化合物的摩尔比至少为3:1的比例送入反应区域,在固体酸的存在下(如酸性离子交换
树脂)中反应这些化合物,生成液体反应混合物而不将
水从反应混合物中分离出来,将液体反应混合物从反应区域中作为液体产品流撤出,并将液体反应产物流送入蒸馏塔以从未反应的多羟基化合物中分离出环状
缩醛化合物,并可选择性地将未反应的多羟基化合物回收到反应区域。该过程以至少90%的产率生产环状
缩醛化合物,并具有长寿命的催化剂。该过程也适用于从酮化合物制备环状
缩酮。