Production method of sodium 0-ethylphosphate

A technology of sodium ethyl phosphate and a production method, which is applied in the direction of phosphorus organic compounds, can solve the problems of excessive impurity phosphite and chloride, difficulty in meeting the demand of the international market, and insufficient stability of the content, and achieve the effect of stable content

Inactive Publication Date: 2011-12-07
ZHEJIANG JIAHUA CHEM
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Problems solved by technology

The content of the existing 0-ethyl sodium phosphate is not stable enough, impurity phosphite a

Method used

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  • Production method of sodium 0-ethylphosphate

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[0019] The production method of 0-ethyl sodium phosphate is characterized in that phosphorus trichloride and ethanol rapidly complete the chemical reaction under the condition of negative pressure and 15 degrees Celsius, and at the same time, under the temperature condition of 70-85 degrees Celsius, the deacidification pot is used in high vacuum The hydrogen chloride and ethyl chloride gas produced in the reaction process are quickly removed, so that the diethyl phosphite content of the reactant reaches more than 80%, and the acidity is less than 5%.

[0020] After the diethyl phosphite is cooled to a temperature of 10 degrees Celsius, a sodium hydroxide solution of a certain concentration is added dropwise in the temperature range of 60-70 degrees Celsius, and then the temperature is gradually raised to 70 degrees Celsius and kept for two hours. After the reaction is finished, the measured pH value is 7.5, which is the end point of the reaction. Otherwise, sodium hydroxide or ...

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Abstract

The production method of 0-ethyl sodium phosphate, phosphorus trichloride and ethanol quickly complete the chemical reaction under negative pressure and 15 degrees Celsius, and at the same time, under the temperature of 70-85 degrees Celsius, the reaction process is quickly released through the deacidification pot in high vacuum The hydrogen chloride and ethyl chloride gas produced in the reaction make the reactant diethyl phosphite content more than 80%, and the acidity is less than 5%; after the diethyl phosphite is cooled to 10 degrees Celsius, it will be in the temperature range of 60-70 degrees Celsius Add a certain concentration of sodium hydroxide solution dropwise, and then gradually raise the temperature to 70 degrees Celsius and keep it for two hours; after the reaction, the measured pH value is 7.5, which is the end point of the reaction; the solution after the reaction is recovered by vacuum distillation. ethanol produced in the process. The content of the O-ethyl sodium phosphate produced by the invention is stable, and the impurity phosphite and chloride will not exceed the standard.

Description

(1) Technical field [0001] The invention relates to chemical synthesis and by-product recovery technology, in particular to a production method of O-ethyl sodium phosphate. (2) Background technology [0002] 0-Sodium ethyl phosphate product structure [0003] [0004] Molecular formula: C2H6O 3PNa Relative molecular mass: 132.03 Reaction equation for producing 0-ethyl sodium phosphate: [0005] 1. Esterification reaction: [0006] Main reaction: PCl3+3C2H5OH→(C2H5)2POH+C2H5Cl+2HCl [0007] Side reaction: PC13+3C2H5OH→3C2H5Cl+2H3PO3 [0008] 2. Synthesis reaction: [0009] Main reaction: (C2H5)2POH+NaOH [0010] Side reaction: HCl+NaOH→NaCl+H2O. [0011] The main use of 0-ethyl sodium phosphate is to produce agricultural fungicides, and the current foreign demand is about 5,000 tons. The content of the existing 0-ethyl sodium phosphate is not stable enough, and the impurity phosphite and chloride exceed the standard, so it is difficult to meet the demand of the in...

Claims

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Application Information

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IPC IPC(8): C07F9/08
Inventor 周少华范素珍范莲生
Owner ZHEJIANG JIAHUA CHEM
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