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Method for producing acetamiprid

A production method, acetamiprid technology, applied in the field of acetamiprid production, can solve problems such as insufficient reaction, unsatisfactory reaction selectivity and yield of chemical synthesis, uneven mixing of materials, etc.

Inactive Publication Date: 2003-04-30
TIANJIN UNIV
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  • Abstract
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  • Claims
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Problems solved by technology

Using 2-chloro-5-chloromethylpyridine and N-cyano-N-methylacetamidine as raw materials, the synthetic method of synthesizing the target product through a one-step method is an industrial production method adopted by all domestic manufacturers of acetamiprid raw materials route, but they all use stirred tank reactors for the reaction. The stirred tank reactor has complex structure, large power consumption, uneven mixing of materials, easy to exist stirring dead zone, so that the reaction is not sufficient, so that the selectivity and yield of the chemical synthesis reaction are not good. too ideal

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with embodiment:

[0013] 1. Add N-cyano-N-methylacetamidine, anhydrous potassium carbonate, benzyltriethylammonium chloride, and dimethylformamide in a jet loop reactor with a molar ratio of 1:1.5:0.02:5 , turn on the jet pump 4 of the jet loop reactor 1, and under the impetus of the jet pump 4, the material and the solvent circulate in the jet loop reactor 1, flow upward in the guide tube 2, and flow between the guide tube 2 and the jet loop reactor. The annulus of reactor 1 flows downward, and the mixture of overflow material and solvent passes through the cyclone separator 5 to complete solid-liquid separation, and the solid material returns to the jet loop reactor 1 from the bottom of the cyclone separator 5, and the liquid material is circulated externally. Under the impetus of the jet pump 4, it is sprayed into the jet loop reactor 1 again through the nozzle 3, so that the material and the solve...

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Abstract

A process for preparing acetamiprid includes steps as mixing N-cyano-N-methylacetamidine, anhydrous potassium carbonate, ammonium benzyltriethylchloride and dimethyl formamide in jet circulating reactor, reacting at 25-30 deg.C for 60-90 min while dropping 2-Cl-5-chloromethyl pyridine, discharging resultant, pumping filter, vacuum distillation of fitlrate for recovering dimethyl formamide, washing filtered cake with ethyl acetate, and vacuum drying. Its advantages are high selectivity and output rate, simple structure and low energy consumption.

Description

technical field [0001] The invention relates to a method for producing pesticides, in particular to a method for producing acetamiprid. technical background [0002] Currently, 3-methylpyridine heterocyclic insecticides represented by imidacloprid, acetamiprid, fluazifop-p-butyl, and valalifop, have With the advantages of systemic absorption, broad spectrum, high efficiency, low toxicity, low residue, long-lasting effect, and good safety, it has been widely used at home and abroad. Using 2-chloro-5-chloromethylpyridine and N-cyano-N-methylacetamidine as raw materials, the synthetic method of synthesizing the target product through a one-step method is an industrial production method adopted by all domestic manufacturers of acetamiprid raw materials route, but they all use stirred tank reactors for the reaction. The stirred tank reactor has complex structure, large power consumption, uneven mixing of materials, easy to exist stirring dead zone...

Claims

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Application Information

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IPC IPC(8): A01N47/40
Inventor 闻建平毛国柱潘磊王长林乔萍
Owner TIANJIN UNIV
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