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Production method of dimethyl phosphite

A technology of dimethyl phosphite and a production method, applied in the field of chemical products, can solve the problems of frequent operation, high labor intensity, limited production capacity and the like, and achieve the effects of high product purity and simple production process

Inactive Publication Date: 2017-08-22
XUZHOU JIANGHAIYUAN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation method of dimethyl phosphite is obtained by the direct reaction of methanol and phosphorus trichloride. The specific methods include: solvent reaction and solvent-free reaction. The specific methods include vapor-liquid reaction, vapor-vapor reaction, discontinuous method, continuous method, etc. Because the reaction is a violent exothermic reaction, the reaction speed is fast, and it is completed in an instant. The discontinuous method is frequently operated, labor-intensive, and the production cycle is long, the utilization rate of equipment is low, and the production capacity is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] A method for producing dimethyl phosphite, which is carried out as follows: use phosphorus trichloride and methanol as raw materials and put them into a reactor for reaction, add a catalyst, and react at 20°C for 10 hours to obtain dimethyl phosphite;

[0012] The catalyst is ferric chloride, and the catalyst is added into concentrated sulfuric acid to carry out surface treatment, and the treatment time is controlled at 30-40s;

[0013] Described phosphorus trichloride and methanol molar ratio: 0.8: 3.3;

[0014] The pressure control in the reactor is: 1.2Mpa, and the stirring speed is 100 rpm.

Embodiment 2

[0016] A production method of dimethyl phosphite, which is carried out as follows: use phosphorus trichloride and methanol as raw materials and put them into a reactor for reaction, add a catalyst, and react at 30°C for 20 hours to obtain dimethyl phosphite;

[0017] The catalyzer is ferric chloride, and the catalyzer is added in concentrated sulfuric acid to carry out surface treatment, and the treatment time is controlled at 40s;

[0018] Described phosphorus trichloride and methanol molar ratio: 1.1: 3.2;

[0019] The pressure control in the reactor is: 1.2Mpa, and the stirring speed is 100 rpm.

Embodiment 3

[0021] A production method of dimethyl phosphite, which is carried out as follows: take phosphorus trichloride and methanol as raw materials and put them into a reactor for reaction, add a catalyst, and react at 20-30°C for 10-20 hours to obtain phosphorous acid Dimethyl ester;

[0022] The catalyst is ferric chloride, and the catalyst is added into concentrated sulfuric acid to carry out surface treatment, the treatment time is controlled at 35s, and the temperature is at 20°C.

[0023] Described phosphorus trichloride and methanol molar ratio: 1.1: 3.3;

[0024] The pressure control in the reactor is: 1.2Mpa, and the stirring speed is 100 rpm.

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Abstract

The invention discloses a production method of dimethyl phosphite. The method includes the steps that phosphorus trichloride and methyl alcohol are adopted as raw materials to be put into a reaction still for reaction; after adding catalysts, the raw materials are reacted under the temperature of 20-30 DEG C for 10-20 h to obtain the dimethyl phosphite; ferric chloride is adopted as a catalyst and added into concentrated sulfuric acid for surface treatment, and meanwhile, the time of the surface treatment is controlled within 30-40 seconds; the mole ratio of the phosphorus trichloride to methyl alcohol is (0.8-1.1) : (3.2-3.3); the pressure inside the reaction still is controlled at 1.2 Mpa, and the stirring speed is controlled at 100 r per min. The production method of dimethyl phosphite has the advantages of simple production process and high product purity, and is suitable for large-scale industrial production.

Description

technical field [0001] The invention provides a method for producing dimethyl phosphite, which belongs to the technical field of chemical products. Background technique [0002] The currently known dimethyl phosphite has a molecular formula of C2H7O3P and a molecular weight of 110.05. The appearance is a colorless transparent liquid with a slight fragrance. The boiling point is 170°C and the relative density is 1.20. It is soluble in water and easily soluble in alcohol, ether, etc. Organic solvents. The preparation method of dimethyl phosphite is obtained by the direct reaction of methanol and phosphorus trichloride. The specific methods include: solvent reaction and solvent-free reaction. The specific methods include vapor-liquid reaction, vapor-vapor reaction, discontinuous method, continuous method, etc. Because the reaction is a violent exothermic reaction, the reaction speed is fast, and it is completed in an instant. The discontinuous method has frequent operations, h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07F9/142
CPCC07F9/142
Inventor 赵中欢
Owner XUZHOU JIANGHAIYUAN CHEM
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