Novel process for waste acid discharge reduction of 3,5-dinitro-4-chlorobenzotrifluoride

The invention discloses a novel process for waste acid discharge reduction of 3,5-dinitro-4-chlorobenzotrifluoride. P-chlorobenzotrifluoride is used as a raw material, a mixture of nitric acid and sulfuric acid is used as a nitrating agent for two-stage nitration, a target compound 3-nitro-4-chlorobenzotrifluoride is obtained after a reaction, then separated waste acid is recycled and reacts withsulfonic acid inner salt to obtain ionic liquid, the ionic liquid and nitric acid are used as a nitrating reaction nitrating agent together, and a nitration reaction can be carried out continuously. Compared with the prior art, pollution is reduced and eliminated from the source, and the method is an environment-friendly chemical process and has a good industrial application prospect. 本发明公开了一种3-硝基-4-氯三氟甲苯废酸减排新工艺。以对氯三氟甲苯为原料，以硝-硫混酸为硝化剂进行二段硝化，反应后得到目标化合物3-硝基-4-氯三氟甲苯，分离出的废酸回收，再与磺酸内盐反应得到离子液体，与硝酸一起作为硝化反应硝化剂，可以继续进行一硝化反应。本发明与现有技术相比，从源头上减少和消除污染，是环境友好的化工过程，有良好的工业化应用前景。