Process for preparing diacetoxybutene.

摘要

The disclosure describes a process for preparing diacetoxybutene, which comprises: reacting butadiene, acetic acid and oxygen in the presence of a palladium-based catalyst; feeding continuously the resulting reaction product into a first distillation tower to distill off by-product water and unreacted acetic acid from the top of the first distillation tower; withdrawing bottoms which contain mainly diacetoxybutene, from the bottom of the first distillation tower; feeding continuously the withdrawn bottoms withdrawn from the first distillation tower into a second distillation tower for distilling out and recovering diacetoxybutene from the top of the second distillation tower; withdrawing bottoms containing high boiling point materials from the bottom of the second distillation tower, so that the content of the high boiling point materials in the bottoms of the second distillation tower is not more than 20 wt%; feeding continuously the withdrawn bottoms into a thin-film evaporator whose internal pressure is kept lower than the bottom pressure of the second distillation tower to carry out evaporation treatment; and recycling the evaporated materials mainly containing diacetoxybutene into the second distillation tower. <IMAGE>