Preparation method of caprolactone

The invention provides a preparation method of caprolactone, which comprises the following steps of: keeping poly-6-hydroxy caproate in a catalyst bed layer at a certain temperature and under a certain pressure for a plurality of times, and distilling at a certain temperature and under a certain pressure to remove light components, thereby obtaining caprolactone. The method has the beneficial effects that (1) the steps are simple, the method is simple, and the reaction progress is fast; and (2) the yield of caprolactone reaches 88% or above. 本发明提供了一种己内酯的制备方法，将聚6-羟基己酸酯在一定温度、一定压力下的催化剂床层中停留若干时间，然后在一定温度、一定压力下蒸馏脱轻组分得到己内酯。本发明的有益效果是：（1）本发明步骤简单，方法简洁，反应进度快。（2）己内酯的收达到88%以上。