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Production method of triethyl phosphite

A technology of triethyl phosphite and production method, which is applied in chemical instruments and methods, compounds of elements of Group 5/15 of the periodic table, organic chemistry, etc., and can solve problems such as ammonia pollution of the environment

Inactive Publication Date: 2006-01-25
罗方明 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Therefore, the production of triethyl phosphite by ammonia method can only reach 80% at present, and the purity is about 98%.
[0012] In addition, in the process of ammonia production, there is a problem of ammonia polluting the environment

Method used

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  • Production method of triethyl phosphite
  • Production method of triethyl phosphite
  • Production method of triethyl phosphite

Examples

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Embodiment Construction

[0024] The present invention will be further described below with embodiment.

[0025] The raw materials phosphorus trichloride and dehydrated alcohol used for the metering synthesis, the solvent toluene and the acid-binding agent triethylamine. In order to prevent the insufficient protection of triethyl phosphite caused by the lack of triethylamine decomposed in the early stage of water washing, excessive triethylamine should be used. In consideration of avoiding unnecessary energy consumption in the production process, the excess of triethylamine is preferably controlled at no less than 0.2% of the reaction amount.

[0026] When synthesizing, anhydrous ethanol and triethylamine are well mixed in a solvent, and then phosphorus trichloride is reacted with the above mixture. In order to improve the yield, when the reaction takes place, measures should be taken to disperse the reactants in time and fully. This is because, if the reactant is not in a highly dispersed state, the...

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Abstract

The invention provides a process for preparing triethyl phosphate which comprises, using phsophorus trichloride and absolute alcohol as raw material, synthesizing in benzene solvents, then segregating the expected outcome yield, the synthesis is carried out at the presence of triethylamine. The invention has the advantages of increased yield and improved product purity.

Description

Technical field: [0001] The present invention relates to manufacture triethyl phosphite by chemical method. Background technique: [0002] At present, the domestic production of triethyl phosphite adopts the ammonia method, and the product is obtained through synthesis, (alkali) water washing, layering in a layered tower, salt drying and dehydration, and distillation. figure 1 It is a block diagram of the production process of the ammonia process. [0003] Under the ammonia method, the synthesis is based on phosphorus trichloride (PCL 3 ) and absolute ethanol (C 2 h 5 OH) as raw material, the reaction is carried out in a benzene solvent, and ammonia gas (NH 3 )neutralize. [0004] During production, the injection ratio of ammonia gas and phosphorus trichloride is not easy to control accurately, and generally can only be controlled within a certain range. Therefore, under- and over-dosing often occur. When the amount is insufficient, the hydrogen chloride (HCL) produced...

Claims

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Application Information

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IPC IPC(8): C07F9/142
Inventor 罗方明罗朝林
Owner 罗方明
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