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Method for producing hypophosphorous acid

A technology of hypophosphorous acid and concentrated sulfuric acid, which is applied in the direction of hypophosphorous acid and phosphorus oxyacids, can solve the problems of low output and waste water, and achieve the effect of improving production capacity

Active Publication Date: 2008-05-21
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method has low yield and can generate waste water

Method used

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Embodiment Construction

[0010] A method for producing hypophosphorous acid, it comprises the following steps:

[0011] a. First put 1 part of concentrated sulfuric acid into the reaction kettle, then put 2 parts of hypophosphorous acid and stir for 1-2 hours;

[0012] b. After the reaction is over, separate the slag and the feed liquid with a centrifuge, the separated feed liquid is hypophosphorous acid with a content of 70-75%, and the slag is sodium sulfate;

[0013] c. Add a sufficient amount of barium hydroxide solution in the isolated hypophosphorous acid feed liquid, so that the sulfate radical generates barium sulfate precipitation, and remove the barium sulfate by filtration to obtain hypophosphorous acid;

[0014] d. Add water to the hypophosphorous acid obtained in step c to adjust to a concentration of 50%, and then pack it to obtain the hypophosphorous acid product.

[0015] The hypophosphorous acid product produced with the present invention reaches following standard:

[0016] ...

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PUM

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Abstract

The invention relates to a method of producing hypophosphorous acid, which comprises the following steps: a. a portion of concentrated sulfuric acid is put into a reaction vessel, in which two portions of hypophosphorous acid are fed, and then the mixture solution is stirred and reacts for 1-2 hours; b. after the reaction is finished, residue and feed liquid are separated by a centrifuge, the feed liquid separated is 70-75 percent of the hypophosphorous acid by content and the residue is sodium sulfate; c. adequate barium hydroxide solution is added into the feed liquid of the hypophosphorous acid separated, which causes sulfate radical to generate barium sulfate deposition, and the barium sulfate is removed through filtration, thus obtaining the hypophosphorous acid; d. the concentration of the hypophosphorous acid obtained in the step c is adjusted to 50 percent by adding water and then the solution obtained is packed, thus obtaining the hypophosphorous acid product. The invention uses the concentrated sulfuric acid and sodium hypophosphite to generate the hypophosphorous acid and the sodium sulfate through reaction, and the technique process does not cause environmental problems such as wastewater, etc. Furthermore, the velocity ratio of double decomposition reaction is very fast, thus being especially applicable for mass production and greatly improving the production capacity of the hypophosphorous acid.

Description

technical field [0001] The present invention relates to a method for producing hypophosphorous acid. Background technique [0002] The existing production of hypophosphorous acid all adopts the ion exchange method, which is to pass the sodium hypophosphite solution through the ion exchange method to obtain hypophosphorous acid with a lower concentration, and then concentrate to obtain the product. This method has low yield and can generate waste water. Contents of the invention [0003] The purpose of the present invention is to provide a method for producing hypophosphorous acid, which uses sulfuric acid and sodium hypophosphite as raw materials to produce hypophosphorous acid, without ion exchange, and will not produce waste water discharge. [0004] The object of the present invention is achieved like this: a kind of method for producing hypophosphorous acid, it may further comprise the steps: [0005] a. First p...

Claims

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Application Information

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IPC IPC(8): C01B25/165
Inventor 余有平李琴陈玲罗光典张伟刚懂先科袁兵
Owner HUBEI XINGFA CHEM GRP CO LTD
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