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Triethyl phosphite producing process

A technology for the production of triethyl phosphite, which is applied in chemical instruments and methods, organic chemistry, compounds of Group 5/15 elements of the periodic table, etc., to improve quality and yield, facilitate operation, and reduce production costs Effect

Inactive Publication Date: 2007-01-03
泰州市天成化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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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 and provide a triethyl phosphite production process with operating specifications, low production cost, no environmental pollution, and improved product quality and yield

Method used

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Examples

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Embodiment Construction

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

[0011] Put the measured mixed solvent 1700L prepared by o-dichlorobenzene and NN-dimethylaniline in a ratio of 2.5:1 by weight and 253kg of absolute ethanol with a content of 99.0% into a 3000L enamel synthesis kettle in turn, and stir , the rotating speed is 270r / min, and at the same time, the frozen brine is passed into the jacket of the synthesis kettle and the inner coil of the kettle, and 252kg of phosphorus trichloride with a measured content of 98.6% is started to be added dropwise at 8°C, and the residual heat of liquid ammonia is distilled After heating, the converted ammonia gas is passed into the bottom of the kettle, the reaction time is 2h30min, the pH value is controlled at 6-7, and the reaction temperature is 24°C-28°C. When the temperature is too high, the phosphorus trichloride addition rate and the ammonia gas flow rate are simultaneously reduced. , when PH7. After the reaction, th...

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Abstract

The triethyl phosphite producing process with ethanol, phosphorus trichloride, o-dichloro benzene and N, N-dimethyl aniline as material includes the main steps of introducing ammonia, synthesis, water washing, layering, drying and distilling. It has sealed operation process, one distilling step, up reflux system and circular utilization of residual liquid and tail gas, and adopts enamel reactor, conic bottom water washing kettle, serially connected drying tower and other apparatus. The triethyl phosphate is used as plasticizer, stabilizer and additive in producing medicine, pesticide, plastic, dye and lubricant grease. The producing process has high yield, high product purity, no environmental pollution and low production cost.

Description

technical field [0001] The invention relates to a method for preparing triethyl phosphite by taking phosphorus trichloride and absolute ethanol as main raw materials. Background technique [0002] Triethyl phosphite is an important pharmaceutical and pesticide intermediate, and is also the main raw material for the production of plasticizers, stabilizers, brighteners, and additives used in plastics, dyes, and lubricating oils. Its development and application prospects are broad. At present, both at home and abroad, phosphorus trichloride and absolute ethanol are used as the main raw materials, and organic amines or tertiary amines are mostly used as acid-binding agents to synthesize triethyl phosphite, and then ammonia gas is introduced to decompose the acid-binding agent. The reacted mixture is suction filtered, washed and distilled to obtain the product. Since suction filtration and washing are carried out in an unsealed state, some solvents and products will volatilize, ...

Claims

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Application Information

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Patent Type & Authority Applications(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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