Technology for producing azamethiphos in fully-sealed clean manner

Abstract

The invention provides a technology for producing azamethiphos in a fully-sealed clean manner. The technology comprises a step of providing a reaction device; a step of preparing a branched-chain chlorinated product, wherein chlorine gas is fed into a cyclone kettle, the cyclone kettle comprises a first body, a first reaction chamber with an inverted conic structure is disposed in the first body in a hollow manner, oxazolo [4,5-b]pyridine-2-(3H)-one, N,N-dimethyl formamide, paraformaldehyde, thionyl chloride and other raw materials are mixed, uniformly dispersed and pumped into the cyclone kettle by using a first powder-liquid mixing pump, and the raw materials are reacted in the first reaction chamber to obtain the branched-chain chlorinated product; a step of preparing thiophosphate ester in a second reaction unit; and a step of preparing the azamethiphos in a third reaction unit. According to the technology provided by the invention, the azamethiphos can be prepared in a fully-sealed environment and in a clean manner.

Description

technical field [0001] The invention relates to a production process for picoline, in particular to a fully sealed and clean production process for picoline. Background technique [0002] Pyridophos-methyl, also known as pyridophos-methyl, is an excellent insecticide, and its chemical name is S-[6-chloro-oxazole(4,5-b)pyridin-2(3hydrogen)-one group -Methyl]-O,O-dimethyl phosphorothioate with the formula C 9 h 10 ClN 2 o 5 PS, the molecular weight is 324.68. Pyridophos is an excellent acaricide with insecticidal activity. It is a contact and stomach poison with good long-lasting effect and wide insecticidal spectrum. It can be used in cotton, fruit trees, vegetables and livestock, public health and family , prevent and control various mites and moths, aphids, leaf lice, small borers, potato beetles, flies, cockroaches, etc. This agent has low toxicity to humans and animals, and is a safe agent with high efficiency, low toxicity, and low residue. Therefore, picophos Beco...

AI Technical Summary

Problems solved by technology

[0005] However, when the branched-chain chlorinated product is prepared by the traditional process, it is difficult to achieve complete sealing, and the first reaction unit 100 is prone to running, popping, dripping, and leaking during the preparation process.

The gas (such as hydrogen chloride) produced by the branched chlorinated product in the preparation process is highly toxic and corrosive, and leakage will easily affect the production environment and human health, which is not conducive to environmental protection.

There are two reasons: the first, because the oxazol[4,5-b]pyridin-2(3H) ketone is a solid raw material, it needs manual feeding every time, and the first reaction must be opened for manual feeding. kettle 10, affecting the sealing of the first reaction kettle 10

Second, since the first reactor 10 has a first stirring device 50, the sealing point between the first stirring device 50 and the first reactor 10 is easily affected by the raw materials for preparing the branched chlorinated products such as chlorination. The corrosion of sulfoxide and the gas produced in the reaction, such as hydrogen chloride, affects the sealing of the first reaction kettle 10 and becomes a hidden danger that cannot prevent the leakage of harmful gases

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