Method for preparing acephate

The technology of an acephate and a new method is applied in the field of pesticide preparation, can solve the problems of low total separation yield, reduced product yield and purity, separation difficulty, etc., and achieves overcoming neutralization process and reducing decomposition loss. , the effect of reducing side reactions
CN101074241AInactive Publication Date: 2007-11-21SHANDONG HUIHAI PHARMA & CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHANDONG HUIHAI PHARMA & CHEM
Publication Date
2007-11-21
Estimated Expiration
Not applicable · inactive patent

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Abstract

Production of acephate by ketene is carried out by taking ketene and 0,0-dimethyl-thiophosphoryl triamide as raw materials, acetylating reacting ketene with 0,0-dimethyl-thiophosphoryl triamide under condition of acidation catalyst and organic solvent to obtain acetylated 0,0-dimethyl-thiophosphoryl triamide, reacting for acetylated 0,0-dimethyl-thiophosphoryl triamide under isomerization catalyst condition to prepare acephate solution, crystallizing, solid-liquid separating and drying to obtain acephate coarse powders. It has better recovery rate and purity, has less consumption and no environmental pollution.
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Description

1. Technical field:

[0001] The invention relates to a method for preparing an insecticide, in particular to a new method for preparing acephate from ketene. 2. Background technology:

[0002] Acephate is an acetylated derivative of the insecticide methamidophos. It is a good high-efficiency, low-toxicity, and low-residue broad-spectrum insecticide. It is effective against major pests of rice, cotton, vegetables, and fruit trees. It has good control effect and is one of the ideal varieties to replace highly toxic and high residue pesticides. Especially in the current social and economic development, some highly toxic pesticides such as methamidophos, parathion (1605), methyl parathion (methyl 1605), monocrotophos, ammonium phosphate and other five highly toxic pesticides Since January 1, 2007, the use in agriculture has been completely prohibited, and the structural adjustment of the agricultural industry is inevitable.

[0003] At present, the production method of acephate...

Claims

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