Synthesis method of 2-methyl-4-chlorophenoxyacetic acid
A technology of o-methylphenoxyacetic acid and chlorophenoxyacetic acid, applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation, etc., can solve the problem of reducing product content and yield, refractory waste acid, reaction Incomplete and other problems, to achieve the effect of increasing content and yield, reducing waste acid production, and less "three wastes"
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[0019] A kind of synthetic method of 2-methyl-4-chlorophenoxyacetic acid, comprises the following steps:
[0020] (1) Preparation of sodium chloroacetate: add quantitative chloroacetic acid and sodium bicarbonate to a special reactor, mix and stir for 2 hours, and simultaneously use 25°C water for circulating heating, and add water after sampling to completely dissolve as the reaction end point;
[0021] (2) Preparation of o-methylphenoxyacetic acid: add o-cresol in a special reactor, put it into the reaction kettle together with sodium chloroacetate under stirring and heat up to reflux, add dropwise 32% sodium hydroxide solution, and Make sure the pH value of the solution is 8-9. After the dropwise addition, continue to remove phenolic water until the temperature rises to 120°C, then start to cool down and add water, and then add hydrochloric acid dropwise to adjust the pH of the solution. After the acid adjustment is completed, suction filter and dry the filter cake. o-methy...
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