Micro-channel reactor and preparation method of high-content dichlorvos

A micro-channel reactor, dichlorvos technology, applied in the field of preparation of dichlorvos, can solve the problem of many side reactions in the microreactor

Active Publication Date: 2020-10-20
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There are many side reactions that are prone to occur in the microreactor

Method used

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  • Micro-channel reactor and preparation method of high-content dichlorvos
  • Micro-channel reactor and preparation method of high-content dichlorvos

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Embodiment Construction

[0033] Such as figure 1 The microchannel reactor shown is a three-layer sandwich structure, with flowing heating medium in the upper and lower layers, and the middle layer is a multi-stage series heart-shaped reaction space; the upper part is reserved for the suction of the middle reaction space. Vacuum holes, holes covered with molecular sieves.

[0034] 1, the trimethyl phosphite (99.6%) of gross weight 252 grams and the chloral (99.7%) of 300 grams, through balance metering, adjust the feed rate 75.6g / min of trimethyl phosphite, three The feed rate of chloroacetaldehyde is 90.0g / min, and the temperature of the reaction module is set at 50°C. After passing through 3 reaction modules, the gas-liquid separation is carried out in the four-necked flask, and the methyl chloride gas is cooled to the vacuum system and then the methyl chloride is removed. In the recovery device, the temperature in the four-necked flask was maintained at 70°C, the vacuum degree was -0.08 Mpa, the re...

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Abstract

The invention discloses a micro-channel reactor. The micro-channel reactor is of a three-layer sandwich structure, wherein a flowing heating medium is arranged in the upper layer and the lower layer,and the middle layer is a reaction space of a multi-stage series heart-shaped structure; a vacuum pumping hole communicating with the middle-layer reaction space is locally reserved in the upper layer; and the hole is covered with a molecular sieve or a semipermeable membrane with a pore diameter of 0.6-0.7 nm. The micro-channel reactor is used for producing dichlorvos, the temperature of the heating medium is 40-50 DEG C, and the air pressure of the reaction space is minus 0.02 to minus 0.08 Mpa. According to the invention, when methyl chloride and water vapor volatilize, trimethyl phosphiteand trichloracetic aldehyde cannot be entrained, side reactions cannot be generated, trichloracetic aldehyde cannot form hydrate, and a reaction speed and a conversion rate are increased.

Description

technical field [0001] The invention relates to a structure of a microchannel reaction device and a preparation method of dichlorvos. Background technique [0002] Dichlorvos is a broad-spectrum organophosphorus insecticide and acaricide known for its quick action, low residue and no odor. Because of its high vapor pressure, it is mainly gas-phase action (also has contact killing effect), so it has a good effect on some hidden pests, such as leaf rollers and moth larvae. There is no need to spray the medicine in high temperature, and fumigation can play a very good effect. Because of its low residual toxicity, it can be used in vegetables, mulberry, and tea. [0003] The content of dichlorvos produced by the one-step dichlorvos clean production process is significantly higher than that of the trichlorfon hydrolysis method. The content of dichlorvos is stable at more than 95%, and the highest content can reach 96%. Products containing chloral and trimethyl phosphite and ot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/113B01J19/00
CPCC07F9/113B01J19/0093B01J19/0013Y02P20/10
Inventor 蒋俊周冬冬吉顺柏丁伟殷日祥
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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