- Preparation method of methomyl oxime
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The invention discloses a preparation method for methomyl oxime. The preparation method comprises the following steps: (1) respectively dissolving acetaldehyde oxime and chlorine gas in an organic solvent to obtain an organic solution of acetaldehyde oxime and an organic solution of chlorine gas, and dissolving sodium methyl mercaptide and sodium hydroxide in an organic solvent to obtain a mixed organic solution; (2) with the organic solution of acetaldehyde oxime and the organic solution of chlorine gas as raw materials, carrying out continuous feeding for a chlorination reaction; and (3) immediately subjecting a chlorinated mixed solution obtained by a chlorination reaction to a methylthio substitution reaction with the mixed organic solution, removing the solvent from a crude methomyl oxime product obtained by the reaction, and adding a small amount of water to wash the crude methomyl oxime product so as to obtain high-quality methomyl oxime. The method is controllable in reaction heat, small in by-product influence, short in time, capable of avoiding decomposition of chloroacetaldoxime, low in the amount of generated wastewater and free of wasterwater odor, and the obtained finished methomyl oxime is high in yield and quality.
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Paragraph 0037-0072
(2020/03/03)
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- Process for chlorination of acetaldoxime
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Continuous or semi-continuous process for preparing acetohydroxamyl chloride. Acetaldoxime and chlorine are introduced simultaneously into an aqueous reaction medium. The reaction is conducted at an acetaldoxime concentration below 1%.
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