Synthesizing method for aminobenzene arsenic acid
A technology of p-aminophenylarsenic acid and a synthesis method, applied in the field of veterinary drug synthesis, can solve the problems of large consumption of raw materials, troublesome waste water treatment, low utilization rate and the like, and achieve the effects of simple operation, high utilization rate of raw materials and low cost
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Embodiment 1
[0031] Add 500kg of aniline, 10kg of polyacrylamide, and 0.5kg of β-cyclodextrin into a 2000L enamel pot. When ready, start stirring and raise the temperature to 160°C. Add 1000kg of arsenic acid aqueous solution (mass concentration 85%) dropwise. Control the temperature at 150-155°C, the drop rate of the arsenic acid aqueous solution is 8-11kg / min, after the addition of the arsenic acid is completed, start the reaction timing, the reaction time is about 5.5 hours, the reaction temperature is controlled at 160-165°C, after the reaction, turn off the Steam, concentrate at normal pressure and recover the dehydrating agent to obtain a concentrated solution, add 1200L of water to the concentrated solution to adjust the pH value to 3.0, raise the temperature to reflux and react for 1 hour, then cool the reaction solution to 10-15°C, filter to obtain filter cake A and filtrate A, the filter cake A is the crude product of p-aminobenzene arsenic acid, which is decolorized by activated ...
Embodiment 2
[0034]Add 500kg of aniline, 15kg of tetrachlorethylene, and 0.5kg of β-cyclodextrin into a 2000L enamel pot. When ready, start stirring and heat up to 160°C, add 943kg of arsenic acid aqueous solution (mass concentration 85%) dropwise, and control the dropwise temperature. At 150-155°C, the dropping rate of the arsenic acid aqueous solution is 8-11kg / min, and the dropping time is about 90 minutes. After the arsenic acid is added dropwise, start the reaction timing. The reaction time is about 5.5 hours, and the reaction temperature is controlled at 160°C. After the reaction is completed, turn off the steam, recover the dehydrating agent, and obtain the concentrated solution. Add 1000L of water to the concentrated solution to adjust the pH value to 3.0, and raise the temperature Reflux and react for 1 hour, then cool the reaction solution to 10-15°C, filter to obtain filter cake A and filtrate A, filter cake A is the crude product of p-aminobenzenearsenic acid, then decolorize wi...
Embodiment 3
[0036] Add 500kg of aniline, 16kg of dicyclohexyldiimine, and 0.5kg of EDTA-2Na into a 2000L enamel pot. When ready, start stirring and heat up to 160°C. Add 1000kg of arsenic acid aqueous solution (mass concentration 85%) dropwise. Control at 150-155°C, and the rate of addition is 8-11kg / min. After the addition of arsenic acid is completed, start the reaction timer. The reaction time is about 5.5 hours. The reaction temperature is controlled at 160-165°C. The pH value is 3.0, heat up to reflux and react for 1 hour, then cool the reaction solution to 10-15°C, filter to obtain filter cake A and filtrate A, filter cake A is the crude p-aminobenzene arsenic acid, decolorize with activated carbon and then filter , the filtrate was cooled and crystallized, centrifuged and dehydrated, precipitated and dried to obtain 285kg of p-aminobenzene arsenic acid, with a yield of 58%. After the filtrate A (aqueous solution of aniline arsenate) was decolorized by activated carbon, it was conce...
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