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Method for recovering phosphorous acid by acidolysis of dimethyl phosphite distillation residual liquid

A technology of dimethyl phosphite and phosphorous acid, which is applied in the field of phosphorous acid recycling, can solve the problems of high recycling cost, large sales revenue, and difficult disposal, and achieve the effect of improving recycling efficiency

Inactive Publication Date: 2012-08-15
HUBEI TAISHENG CHEM
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the production residual liquid, if it is treated in an environmentally friendly way, it is very difficult to deal with it; if it is sold directly as waste, it will lose a lot of sales revenue and may leave environmental protection hazards
For the recovery of dimethyl phosphite residue, the current manufacturers mainly adopt the method of hydrolysis, but because the methanol solution produced by hydrolysis still needs to be rectified before it can be used continuously, the recovery cost is relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0018] Embodiment: the dimethyl phosphite raffinate is filtered through a filter press; then the raffinate enters the acidolysis tank, and hydrochloric acid is added in the acidolysis tank to carry out acidolysis, because the content of dimethyl ester in the raffinate is about 5%, the added The content of hydrochloric acid is 25%, and the mass ratio of raffinate to hydrochloric acid is 7.53:1. Calculated according to the amount of feed, for every 6t of raffinate added, at least 0.8t of hydrochloric acid is needed. 5~6; the residual liquid after acidolysis enters the reaction kettle to stir, further acidolysis, heat up to 135 ℃ ~ 140 ℃ for concentration; The material device is used to obtain the finished phosphorous acid, which is packaged after passing the test.

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PUM

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Abstract

The invention discloses a method for recovering phosphorous acid by acidolysis of dimethyl phosphite distillation residual liquid. Dimethyl phosphite residual liquid is subjected to the steps of filter pressing, acidolysis, secondary acidolysis concentration, crystallization, material washing and the like to obtain phosphorous acid. In the method for recovering phosphorous acid by acidolysis of dimethyl phosphite distillation residual liquid, phosphorous acid is recovered by combination of high-temperature distillation and temperature-lowering crystallization, the recovery efficiency is high, and the existing chloromethane recovering device is utilized for recovering chloromethane during the recovery process of phosphorous acid, and therefore, the recovery benefit is further enhanced.

Description

technical field [0001] The invention relates to a method for recovering phosphorous acid, in particular to a method for recovering phosphorous acid through acidolysis from dimethyl phosphite distillation raffinate. Background technique [0002] In the production process of dimethyl phosphite, dimethyl phosphite residue will be produced as a by-product. For example, a dimethyl phosphite production device with an actual production capacity of 35,000 tons will by-produce 3,500 tons of dimethyl phosphite residue per year (10 : 1 ratio), which mainly contains 75-85% phosphorous acid and about 5% dimethyl phosphite. For the production residue, if it is treated in an environmentally friendly way, it will be very difficult to deal with; if it is directly sold as waste, it will lose a lot of sales revenue and may leave environmental protection risks. For the recovery of dimethyl phosphite residue, the current manufacturers mainly adopt the method of hydrolysis, but because the metha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
Inventor 熊涛田义群刘训军万义昭
Owner HUBEI TAISHENG CHEM
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