Preparation method of beta-isophorone

The invention provides a preparation method of beta-isophorone. Alpha-isophorone added with the aid is subjected to isomerization reaction in a tubular reactor in a pressurized high-temperature manner, reaction liquid is subjected to reduced-pressure rectification to obtain a beta-isophorone product, the product content is greater than 99.5%, a basic catalyst is not used in the reaction, and the retention time of the reaction liquid at high temperature is shortened by using the aid and optimizing the reactor, so that the yield of the beta-isophorone is increased, and the yield of the beta-isophorone is increased. The product stability is improved, heavy components are prevented from being generated, the yield of the beta-isophorone product is larger than 99%, and industrial production is better facilitated. 本发明提供了一种β-异佛尔酮的制备方法。加入助剂的α-异佛尔酮在管式反应器内通过加压高温的方式进行异构反应，反应液通过减压精馏得到β-异佛尔酮产品，产品含量大于99.5%，反应未使用碱性催化剂，通过助剂的使用及反应器的优化，缩短了高温下反应液停留时间，提高了产品稳定性，避免了重组分生成，β-异佛尔酮产品收率＞99%，更有利于工业化生产。