Preparation technology of high-purity 2-methyl-4-chlorophenoxyacetic acid
A technology of chlorophenoxyacetic acid and preparation process, applied in the field of pesticides, can solve problems such as less than 10,000 tons
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[0014] The present invention will not be described below in conjunction with the embodiments.
[0015] The preparation process of high-purity 2-methyl-4-chlorophenoxyacetic acid comprises the following steps:
[0016] (4) Combining external circulation vacuum rectification and liquid-liquid stratification to reuse o-cresol in sodium o-cresol;
[0017] The product generated by the reaction of o-cresol and sodium hydroxide is sodium o-cresolate solution and excess o-cresol, and the o-cresol and water are removed by rectification under reduced pressure. Layered, o-cresol and water are recycled, and the solution in the bottom of the tower is circulated to the middle of the tower through a pump for recycling.
[0018] (5) Preparation of 2-methyl-4-chlorophenoxyacetic acid by reverse chlorination by external circulation solvent method;
[0019] Using 1,2-dichloroethane as a solvent, chlorine gas and 2-methylphenoxyacetic acid are respectively reversely added to the reactor for chl...
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