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Trimethyl phosphite producing process

A technology for the production of trimethyl phosphite, which is applied in the field of preparing trimethyl phosphite, and achieves the effects of clear and complete process conditions, easy operation, and reduced production costs

Inactive Publication Date: 2008-03-26
泰州市天成化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved in the present invention is to overcome the deficiencies of the existing production process, to provide a production process for trimethyl phosphite with low production cost, no environmental pollution, and improved product quality and yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0010] Below by embodiment the present invention will be further described.

[0011] Put the measured mixed solvent 2100L prepared by xylene and N,N--dimethylaniline in a ratio of 2.5:1 by weight and 202kg of methanol with a mass percentage content of 99.5% into a 3000L enamel synthesis kettle in turn, and stir , the rotating speed is 270r / min, while the frozen brine is passed into the jacket of the synthesis kettle and the coil in the kettle, and at 7°C, 283kg of phosphorus trichloride with a mass percentage content of 98.6% is added dropwise, and the liquid ammonia is passed through After distillation waste heat is heated, the converted ammonia gas is passed into the bottom of the kettle, the reaction time is 2h40min, the pH value is controlled at 6-7, and the reaction temperature is 22°C-26°C. Gas flow, when pH7. After the reaction, the temperature was lowered for 15 minutes to lower the material to 8°C.

[0012] Inject 1400L of NaOH lye with a mass percentage concentrati...

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PUM

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Abstract

The trimethyl phosphite producing process with the materials including methanol, phosphorus trichloride, xylene and N, N-dimethyl aniline includes the steps of introducing ammonia to produce synthesis reaction, water washing, laminating, drying and distilling. The present invention has sealed operation, one-step distillation, circular use of the residual liquid and the tail gas after treatment, etc. Trimethyl phosphite is used as important material for medicine, pesticide intermediate, plastic and many other materials.

Description

technical field [0001] The invention relates to a method for preparing trimethyl phosphite by using phosphorus trichloride and methanol as main raw materials. Background technique [0002] Enyl phosphate insecticides are widely used in agriculture and forestry in my country, and have good insecticidal effects. Trimethyl phosphite is in great demand as the main raw material of enyl phosphate insecticides, and it is also used in the manufacture of plastics and wood industries. Plasticizers, flame retardants and stabilizers also have good development and application prospects. At present, phosphorus trichloride and methanol are used as the main raw materials at home and abroad, and organic amines or tertiary amines are mostly used as acid-binding agents to synthesize trimethyl phosphite, and then ammonia gas is introduced to decompose the acid-binding agent. After the synthesis reaction The mixed material is filtered, washed and distilled to obtain the product. Since suction f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F9/142
Inventor 申厚宝王全民尤小文
Owner 泰州市天成化工有限公司
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