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Dedevap continuous production method

A technology of dichlorvos and temperature control, applied in the production field of dichlorvos, can solve the problems of poor production stability and safety, product quality and yield cannot reach a better level, low production efficiency, etc., and achieve stable product quality and reduce energy. The effect of consumption and improving the efficiency of the device

Inactive Publication Date: 2007-04-25
荆州沙隆达控股有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a preparation method for continuous production of dichlorvos aimed at the deficiencies in the prior art, which solves the problem of low production efficiency, poor production stability and safety, and failure to achieve a higher product quality and yield in the existing production method. excellent level questions

Method used

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  • Dedevap continuous production method

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Experimental program
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Effect test

Embodiment 1

[0011] As shown in the schematic flow chart, first, 900kg of dichlorvos with a content of 91.5% is cast in the first stage reactor 1 as the bottom material of the reactor, and then two raw materials of chloral and trimethyl phosphite are added simultaneously through a flow meter and a circulating pump To the first stage reactor 1 to react, chloral and trimethyl phosphite add-on are respectively 573.5kg / h and 486kg / h, temperature is controlled at 65 ℃, and simultaneously make reaction material from the first stage reactor 1 flows out from the bottom, then overflows from the bottom of the second stage reactor 2 to the insulation reaction in the second stage reactor. There is primer 900kg), content 95.2%. The yield is 99.5% based on chloral and 99% based on trimethyl phosphite. Wherein the process flow includes a cooler 3, the material inlet of the cooler 3 is connected with the discharge port of the first stage reactor 1 by a pipeline, and the material outlet of the cooler 3 is...

Embodiment 2

[0013] First, throwing 900kg content in the first-stage reactor 1 is 91.5% dichlorvos as the reactor bottom material, and then simultaneously adding two kinds of raw materials of chloral and trimethyl phosphite to the first-stage reactor through a flow meter and a circulation pump Carry out the reaction, the addition of chloral and trimethyl phosphite is 573.5kg / h and 486kg / h respectively, and the temperature is controlled at 15°C, and the reaction material is flowed out from the bottom of the first-stage reactor at the same time, and then from the second-stage reactor. The bottom of the first-stage reactor overflowed into the second-stage reactor for heat preservation reaction, the temperature was controlled at 35°C, and the metering was stopped after 3 hours of continuous operation to obtain 1802kg of finished dichlorvos crude oil (900kg of base material still exists in the reactor), with a content of 95.2% . The yield is 99.5% based on chloral and 99% based on trimethyl pho...

Embodiment 3

[0015] First, 900kg content of 91.5% dichlorvos is used as the bottom material of the reactor in the first-stage reactor, and then two kinds of raw materials, chloral and trimethyl phosphite, are added to the first-stage reactor through a flow meter and a circulation pump at the same time. Reaction, the addition of chloral and trimethyl phosphite is 573.5kg / h and 486kg / h respectively, and the temperature is controlled at 65°C, and at the same time, the reaction material flows out from the bottom of the first-stage reactor, and then from the second-stage The bottom of the reactor overflowed to the second-stage reactor for heat preservation reaction, the temperature was controlled at 100°C, and the metering was stopped after 1.5 hours of continuous operation to obtain 1802kg of finished dichlorvos crude oil (900kg of base material still exists in the reactor), with a content of 95.2%. The yield is 99.5% based on chloral and 99% based on trimethyl phosphite. Wherein the process f...

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Abstract

The invention discloses a preparing method of continual manufacturing of atgard, which comprises the following steps: filling atgard base in the first grade reactor; adding trichloroacetaldehyde and trimethyl phosphite into the first grade reactor; controlling the temperature between 0 and 100 deg.c; flowing the reacting material from the first grade reactor to the second grade reactor; insulating at 0-100 deg.c.

Description

technical field [0001] The invention relates to a production method of dichlorvos, in particular to a preparation method of continuous production of dichlorvos. Background technique [0002] Dichlorvos, chemical name: O, O-dimethyl-O-(2,2-dichlorovinyl) phosphate. It is an organophosphorus insecticide that is widely used in agricultural production and requires a large amount. The pure product is a colorless oily liquid, and the industrial product is an amber oily liquid. There are two ways to produce dichlorvos industrially: one is to produce dichlorvos by trichlorfon alkali hydrolysis; the other is to produce dichlorvos by reacting trimethyl phosphite with chloral. Trichlorfon-alkali hydrolysis method to prepare dichlorvos is gradually being eliminated due to complex process, low yield, high consumption and many wastes. [0003] The batch reaction of trimethyl phosphite and chloral to prepare dichlorvos is the most widely used synthesis technology at present, but because ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/14A01N57/12
Inventor 何福春殷宏薛光才杨光富王洪群肖国华廖艳陈华山邹敏潘晖
Owner 荆州沙隆达控股有限公司
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