利用促进剂M生产过程中产生的废弃物在自制催化剂存在下,直接氯化制备除草剂苯噻草胺中间体2-氯代苯并噻唑。通过实验确定最佳溶剂为氯苯,催化剂PCA用量为0.2%(质量),反应温度110～115℃,色谱跟踪确定反应终点,产品收率90%,产品含量99%。 Using the waste produced in the process of the promoter M to produce the herbicide mefenacet intermediate 2-chlorobenzothiazole by direct chlorination in the presence of a self-made catalyst. The optimal solvent for the determination of chlorobenzene was determined experimentally. The amount of PCA catalyst was 0.2% (mass) and the reaction temperature was 110 ~ 115 ℃. The end point of the reaction was confirmed by chromatography. The yield of the product was 90% and the content of the product was 99%.