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Triethyl phosphite producing process

A technology of triethyl phosphite and production process, which is applied in chemical instruments and methods, organic chemistry, compounds of elements of Group 5/15 of the periodic table, etc., to achieve clear and complete process conditions, improve quality and yield, and product quality stable effect

Inactive Publication Date: 2008-03-12
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 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

Experimental program
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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 N,N-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 carry out Stir with a rotating speed of 270r / min. At the same time, feed the frozen brine into the jacket of the synthesis kettle and the inner coil of the kettle. At 8°C, start to add 252kg of phosphorus trichloride with a measured content of 98.6% dropwise, and distill it from liquid ammonia. After the waste heat is heated, the converted ammonia gas is passed into the bottom of the kettle. The reaction time is 2h30min. Flow rate, when pH7. After the reaction, the temperature was lowered for 20 minutes to lower the material to 8°C.

[0012] Inject 1400L of NaOH lye with a concentration of 1.2% into the washing kettle with a conical bottom, pass frozen brine into the inn...

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PUM

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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 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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