Synthesis method of 4-chlorobenzotrifluoride

The invention discloses a synthetic method of 4-chlorobenzotrifluoride. P-chlorotoluene is used as a raw material, and 4-chlorobenzotrifluoride is synthesized through two steps of chlorination and fluorination. Compared with the prior art, the raw materials are subjected to heating dehydration treatment in the dehydration kettle, chlorination side reactions are few, the product purity is high, a graded chlorination device does not need to be added, the technological process is simple, and operation is convenient; according to the chlorination process, a mode of adding the catalyst in batches is adopted, so that the use efficiency of the catalyst is improved, the emission of byproducts and waste gas generated by chlorination reaction in production is greatly reduced, and the emission of pollutants in the production process is reduced. 本发明公开了一种4-氯三氟甲苯的合成方法。以以对氯甲苯为原料，经氯化、氟化二步合成4-氯三氟甲苯。本发明与现有技术相比，采用脱水釜中对原料进行加热脱水处理，氯化副反应少，产品纯度高，而且无需增加分级氯化装置，工艺流程简单、操作方便；本发明氯化工艺中采用分批加入催化剂的方式，提高了催化剂的使用效率，使得生产中由于氯化反应生成的副产物和废气排放大量减少，减少