1,4丁二醇蒸馏底物的回收工艺

Recycling technology of substrate from 1,4-butanediol distillation

在Reppe法生产1,4-丁二醇(BDO)的过程中,刮膜式蒸发器会产生一定量的黏稠蒸馏底物。提出了在加压条件下,以稀硫酸为催化剂,对该底物进行水解处理回收BDO并减少废物排放的工艺过程。最优工艺条件为:硫酸质量分数为15%,稀硫酸与底物质量比(配料比)为1.3∶1.0,反应温度为150℃,反应时间为7h。通过对水解产物的分离与分析,基于底物的BDO回收率可达39.1%。

In the Reppe-technology process of producing 1,4-butanediol（BDO）,a certain amount of viscous substrate is formed in the thin-film evaporator due to intramolecular aggregation of BDO.A process is proposed to recycle the substrate and reduce discharge.The substrate is hydrolyzed by H2SO4solution at the conditions of mass fraction of H 2 SO 4 is 15%,mass ratio of H 2 SO 4 to the substrate is 1.3∶1.0,temperature is 150℃and reaction time is 7h.The results show that BDO based on the raw substrate can be feasibly recovered at the rate up to 39.1%.