By: Zhang Yong et al.
Dicamba was prepared from 2,5-dichlorophenol in a three-stage process. The optimum condition for carbonization was found to be temp.(140～145)℃,pressure 5.5～6.0MPa. In the presence of catalyst JSY-1, the yield of 3,6-dichlorosalicylic acid was increased evidently from 40% up to 66.4%. In process of methylation,the optimum C 7H 4O 3Cl 2∶(CH 3) 2SO 4 1.0∶2.1～2.2. The yield of
dicamba was about 54%
Dicamba was prepared from 2,5-dichlorophenol in a three-stage process. The optimum condition for carbonization was found to be temp.(140～145)℃,pressure 5.5～6.0MPa. In the presence of catalyst JSY-1, the yield of 3,6-dichlorosalicylic acid was increased evidently from 40% up to 66.4%. In process of methylation,the optimum C 7H 4O 3Cl 2∶(CH 3) 2SO 4 1.0∶2.1～2.2. The yield of
dicamba was about 54%Yangzhou pioneer chemical CO.,LTD.
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