Synthesis process of glyphosate intermediate dimethyl phosphite
A technology for the synthesis of dimethyl phosphite and a synthesis process, which is applied in the field of synthesis technology of glyphosate intermediate dimethyl phosphite, can solve the problems of difficult metering control, frequent operations, high labor intensity, etc., and achieves improved efficiency. Conversion rate, avoid acid hydrolysis side reaction, shorten the effect of reaction time
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Embodiment 1
[0030] 64Kg of methanol is measured by the methanol metering tank and enters the esterification reaction kettle, and 106Kg of phosphorus dichloride enters the esterification reaction kettle after passing through the metering tank. Still, the gas generated by the esterification reaction returns to the esterification kettle through the first and second condensers of the esterification, and the feed liquid in the deacidification kettle is dehydrogenated under high vacuum and steam heating conditions, and the feed liquid in the deacidification kettle is deacidified Then enter the rectification kettle for rectification to obtain more than 99% of dimethyl phosphite, pass the aforementioned hydrogen chloride gas into ammonia water, and add a protective agent therein, and the protective agent is dichloroethane. Turn on the stirring system for stirring during the aforementioned esterification reaction, and the stirring time is 15 minutes. Turn on the heat conduction oil heating system d...
Embodiment 2
[0034]65.8Kg of methanol is measured into the esterification reaction kettle through the methanol metering tank, 106Kg of phosphorus dichloride enters the esterification reaction kettle after passing through the metering tank, and the materials enter at the same time according to the proportion. Acid tank, the gas generated by the esterification reaction is returned to the esterification tank through the first and second grade condensers of the esterification, and the feed liquid in the deacidification tank is dehydrogenated under high vacuum and steam heating conditions, and the deacidification of the deacidification tank is carried out. The liquid enters the rectifying kettle for rectification to obtain more than 99% of dimethyl phosphite, and the aforementioned hydrogen chloride gas is passed into ammonia water, and a protective agent is added thereto, and the protective agent is ethylene dichloride. Turn on the stirring system for stirring during the aforementioned esterifi...
Embodiment 3
[0039] 66.3Kg of methanol is measured into the esterification reaction kettle through the methanol metering tank, 106Kg of phosphorus dichloride enters into the esterification reaction kettle after passing through the metering tank, and the materials enter at the same time according to the proportion. Acid tank, the gas generated by the esterification reaction is returned to the esterification tank through the first and second grade condensers of the esterification, and the feed liquid in the deacidification tank is dehydrogenated under high vacuum and steam heating conditions, and the deacidification of the deacidification tank is carried out. The liquid enters the rectifying kettle for rectification to obtain more than 99% of dimethyl phosphite, and the aforementioned hydrogen chloride gas is passed into ammonia water, and a protective agent is added thereto, and the protective agent is ethylene dichloride. Turn on the stirring system for stirring during the aforementioned es...
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