The preparation technology of 2-methyl-4-chlorophenoxyacetic acid dimethylamine salt
A chlorophenoxyacetic acid dimethylamine salt and a preparation process technology, which is applied in the field of preparation of 2-methyl-4-chlorophenoxyacetic acid dimethylamine salt, can solve the problems of precipitation and low use efficiency, and achieve no precipitation , low cost, and the effect of process route optimization
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Embodiment 1
[0016] 1. Add chloroacetic acid to the reaction kettle, add 30% caustic soda solution dropwise to neutralize the reaction, control the temperature at 5°C, and the pressure at normal pressure. When the pH value of the material is 7-8, it is the end of the reaction and sodium chloroacetate is generated;
[0017] 2. Add o-cresol to another reactor, control the temperature at 25°C, the pressure at normal pressure, and the reaction time for 35 minutes. Add 30% caustic soda solution dropwise to react to generate o-cresol sodium. After the reaction, heat preservation is performed;
[0018] 3. Add the sodium chloroacetate from the previous kettle to the o-cresol sodium reaction kettle of the next kettle through the metering tank, control the temperature at 125°C, the reaction time for 9 hours, and the pressure at normal pressure to produce 2 methylbenzene through condensation reaction Sodium oxyacetate;
[0019] 4. Transfer the above reaction materials to the chlorination reactor, add hydroc...
Embodiment 2
[0023] 1. Add chloroacetic acid to the reaction kettle, add 30% caustic soda solution dropwise to neutralize the reaction, control the temperature at 25°C, and the pressure at normal pressure. When the pH value of the material is 7-8, it is the end of the reaction and sodium chloroacetate is generated;
[0024] 2. Add o-cresol to another reactor, control the temperature at 40°C, the pressure at normal pressure, and the reaction time for 25 minutes. Add 30% caustic soda solution dropwise to react to generate o-cresol sodium. After the reaction, heat preservation is performed;
[0025] 3. Add the sodium chloroacetate from the previous kettle to the o-cresol sodium reaction kettle in the next kettle through the metering tank, control the temperature to 130°C, the reaction time is 8 hours, and the pressure is normal pressure, and 2 methylbenzene is produced through condensation reaction Sodium oxyacetate;
[0026] 4. Transfer the above reaction materials to the chlorination reactor, add ...
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