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一种除草剂麦草畏的制备工艺本发明涉及一种除草剂麦草畏的制备工艺,并采用了超临界制备工艺。将2,5-二氯苯酚制成相应的酚钠后,在超临界状态下完成羧基化反应得到3,6-二氯水杨酸,再以碳酸二甲酯为试剂完成O-甲基化制得产物3,6-二氯-2-甲氧基水杨酸,即麦草畏。本发明将传统工艺中非均相的气固反应变为超临界状态下的均相反应,并使用碳酸二甲酯进行O-甲基化反应,有反应产率高,产品质量好,减少环境污染和降低能耗等特点。
The present invention relates to a process for preparing the herbicide dicamba and employs a supercritical process. After the 2,5-dichlorophenol is made into the corresponding sodium phenolate, the carboxylation reaction is completed in the supercritical state to obtain 3,6-dichlorosalicylic acid, and the dimethyl carbonate is used as the reagent to complete the O-methylation The product 3,6-dichloro-2-methoxy salicylic acid, dicamba. In the invention, the heterogeneous gas-solid reaction in the traditional process turns into a homogeneous reaction in a supercritical state, and O-methylation reaction is carried out by using dimethyl carbonate, and the reaction yield is high, the product quality is good, and the environment is reduced Pollution and reduce energy consumption and other characteristics.