Method for continuously synthesizing phosphorous acid

A phosphorous acid, chemical synthesis technology, applied in the direction of phosphorous acid, phosphorus oxyacid, etc., can solve the problems such as no continuous production of phosphorous acid industrialization method.

Active Publication Date: 2010-09-08
NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0007] In the prior art, there is no industrialized method for continuous production of phosphorous acid

Method used

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  • Method for continuously synthesizing phosphorous acid
  • Method for continuously synthesizing phosphorous acid

Examples

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Embodiment 1

[0018] Embodiment one: at first throw 800kg content in the primary hydrolysis kettle 1 and be 45% (w / w) phosphorous acid aqueous solution as reactor base material, then add phosphorus trichloride and water two kinds of raw materials simultaneously by flow meter to The reaction is carried out in the first-stage hydrolysis kettle 1, the addition of phosphorus trichloride and water is 1500kg / h and 1250kg / h respectively, the temperature is controlled at 40°C to 60°C, and the reaction materials are overflowed from the first-stage hydrolysis kettle 1 to the second stage at the same time. Keep warm in the secondary hydrolysis kettle 2, and the temperature is controlled at 40°C to 60°C. The reaction material overflows from the top of the secondary hydrolysis kettle 2 to the finished product storage tank, and the content of the phosphorous acid aqueous solution is 45 (w / w)%. The by-product hydrochloric acid The content is 30%. Wherein the technical process includes an external cooler 3...

Embodiment 2

[0019] Embodiment two: first throw 800kg content in the primary hydrolysis kettle 1 and be 20% (w / w) phosphorous acid aqueous solution as reactor base material, then add phosphorus trichloride and water two kinds of raw materials to the primary stage simultaneously by flow meter The reaction is carried out in the hydrolysis kettle 1, the addition of phosphorus trichloride and water is 1500kg / h and 2150kg / h respectively, the temperature is controlled at 40°C to 60°C, and the reaction materials are overflowed from the primary hydrolysis kettle 1 to the secondary hydrolysis at the same time Kettle 2 is kept warm, the temperature is controlled at 40°C to 60°C, the reaction material overflows from the top of the secondary hydrolysis kettle 2 to the finished product storage tank, and the content of the phosphorous acid aqueous solution is 20% (w / w), and the content of the by-product hydrochloric acid is 30%. Wherein the technical process includes an external cooler 3, the material i...

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Abstract

The invention relates to a method for continuously synthesizing phosphorous acid, comprising the following steps of: fully filling phosphorous acid water solution in a first stage reactor, and then adding phosphorus trichloride and water for reaction at the same time; controlling the temperature to be 10-90 DEG C, and simultaneously leading the reaction material to overflow into a second stage reactor from the first stage reactor for heat preservation reaction; and controlling the temperature to be 10-90 DEG C, and then leading the finished product phosphorous acid water solution to overflow into a finished product storage tank from the second stage reactor. The method has the characteristics of simple technique, stable product quality, good yield, high safety performance, low production cost and the like.

Description

technical field [0001] The invention relates to a preparation method and a device for continuously synthesizing phosphorous acid. Background technique [0002] Phosphorous acid is a low-oxygen acid of phosphorus, and its production methods mainly include the following: ①Phosphorus trichloride hydrolysis method: the production method is from PCl 3 Hydrolysis with water or hydrochloric acid (the reaction is carried out under cooling), the resulting phosphorous acid product is concentrated, dehydrated, and evaporated, and the by-product HCl is absorbed to obtain 31% hydrochloric acid; ② Phosphite method: yellow phosphorus-lime milk method to produce hypophosphorous acid When the by-product calcium phosphite is treated with sulfuric acid to remove calcium sulfate precipitate, the filtrate is refined, concentrated and crystallized to obtain phosphorous acid; ③Phosphorus trioxide hydration method. ④ Electrolysis method: Phosphorous acid is prepared by electrolysis using sodium ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/163
Inventor 薛健张海滨吴金明朱晓斌戴宝江庄辉阳张小宏
Owner NANTONG JIANGSHAN AGROCHEM & CHEM LIMITED LIABILITY
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