CN101181983B - Method for producing hypophosphorous acid - Google Patents

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 hypophosphorousacid 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 concentrationof 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

A kind of method of producing Hypophosporous Acid, 50

Technical field

The present invention relates to a kind of method of producing Hypophosporous Acid, 50.

Background technology

The existing Hypophosporous Acid, 50 of producing all adopts ion exchange method, is that sodium hypophosphite solution is passed through ion-exchange techniques, obtains the low concentration Hypophosporous Acid, 50, through concentrating, obtains product again.This method yields poorly, and can produce waste water.

Summary of the invention

Purpose of the present invention is exactly that a kind of method of producing Hypophosporous Acid, 50 will be provided, and it uses sulfuric acid and sodium hypophosphite to be the raw material production Hypophosporous Acid, 50, need not pass through ion-exchange, can not produce discharge of wastewater.

The object of the present invention is achieved like this: a kind of method of producing Hypophosporous Acid, 50, and it may further comprise the steps:

A. earlier 1 part the vitriol oil is squeezed in the reactor, squeezed into 2 parts sodium hypophosphite stirring reaction 1-2 hour again;

B. after reaction finishes, separate slag and feed liquid with whizzer, the feed liquid of being separated is the Hypophosporous Acid, 50 of content at 70-75%, and slag is a sodium sulfate;

C. the barium hydroxide solution that adds capacity in isolated Hypophosporous Acid, 50 feed liquid makes sulfate radical generate barium sulfate precipitate, removes by filter barium sulfate and promptly obtains Hypophosporous Acid, 50;

D. the Hypophosporous Acid, 50 that the c step is obtained adds water and is adjusted to after 50% the concentration again that packing promptly obtains the Hypophosporous Acid, 50 product.

The present invention uses the vitriol oil and sodium hypophosphite reaction to produce Hypophosporous Acid, 50 and sodium sulfate, technological process can not brought environmental problems such as waste water, and,, improved the throughput of Hypophosporous Acid, 50 greatly so be particularly suitable for producing in enormous quantities because the replacement(metathesis)reaction velocity ratio is very fast.

Embodiment

A kind of method of producing Hypophosporous Acid, 50, it may further comprise the steps:

A. earlier 1 part the vitriol oil is squeezed in the reactor, squeezed into 2 parts sodium hypophosphite stirring reaction 1-2 hour again;

B. after reaction finishes, separate slag and feed liquid with whizzer, the feed liquid of being separated is the Hypophosporous Acid, 50 of content at 70-75%, and slag is a sodium sulfate;

C. the barium hydroxide solution that adds capacity in isolated Hypophosporous Acid, 50 feed liquid makes sulfate radical generate barium sulfate precipitate, removes by filter barium sulfate and promptly obtains Hypophosporous Acid, 50;

D. the Hypophosporous Acid, 50 that the c step is obtained adds water and is adjusted to after 50% the concentration again that packing promptly obtains the Hypophosporous Acid, 50 product.

The Hypophosporous Acid, 50 product of producing with the present invention reaches following standard:

Project	Hypophosporous Acid, 50	Phosphorous acid	Iron	Chlorine	Vitriol
						Index (%)	＞50.0	＜0.5	＜0.0005	＜0.005	＜0.005

Claims (1)

1. method of producing Hypophosporous Acid, 50 is characterized in that it may further comprise the steps:

A. earlier 1 part the vitriol oil is squeezed in the reactor, squeezed into 2 parts sodium hypophosphite stirring reaction 1-2 hour again;

B. after reaction finishes, separate slag and feed liquid with whizzer, the feed liquid of being separated is the Hypophosporous Acid, 50 of content at 70-75%, and slag is a sodium sulfate;

C. the barium hydroxide solution that adds capacity in isolated Hypophosporous Acid, 50 feed liquid makes sulfate radical generate barium sulfate precipitate, removes by filter barium sulfate and promptly obtains Hypophosporous Acid, 50;

D. the Hypophosporous Acid, 50 that the c step is obtained adds water and is adjusted to after 50% the concentration again that packing promptly obtains the Hypophosporous Acid, 50 product.