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Low-cost production method for co-production of hypophosphorous acid and calcium hypophosphite

A production method, the technology of calcium hypophosphite, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of low cost, achieve the effects of reducing production cost, simple process, and improving production capacity

Pending Publication Date: 2019-09-27
江苏和纯化学工业有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to solve the above-mentioned problems existing in the existing calcium hypophosphite production process, and propose a low-cost production method for the co-production of hypophosphite calcium hypophosphite

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  • Low-cost production method for co-production of hypophosphorous acid and calcium hypophosphite
  • Low-cost production method for co-production of hypophosphorous acid and calcium hypophosphite

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Embodiment Construction

[0014] The technical solution of the present invention will be further described below according to the accompanying drawings.

[0015] Such as figure 1 Shown hypophosphorous acid co-production calcium hypophosphite low-cost production method, wherein the production method of hypophosphorous acid comprises the steps:

[0016] 1) Add sodium hypophosphite into the batching tank containing pure water, stir until the sodium hypophosphite crystals are completely dissolved to obtain a 17-18% sodium hypophosphite aqueous solution;

[0017] 2) Pass the sodium hypophosphite aqueous solution through 001×7 hydrogen-type strong acid ion exchange resin, and exchange sodium ions with hydrogen ions on the resin to obtain dilute hypophosphorous acid;

[0018] 3) Dilute hypophosphorous acid is pumped into the concentration kettle, and concentrated under vacuum under reduced pressure under the condition that the vacuum degree is greater than -0.5MPa, and the temperature of the material in the ...

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Abstract

The invention discloses a low-cost production method for the co-production of hypophosphorous acid and calcium hypophosphite. The production method of the hypophosphorous acid comprises the following steps: 1) preparing an aqueous solution of sodium hypophosphite; 2) enabling the aqueous solution of the sodium hypophosphite to pass through hydrogen type strong-acid ion exchange resin to obtain dilute hypophosphorous acid; 3) performing vacuum concentration and filtration on the dilute hypophosphorous acid to obtain commercial hypophosphorous acid with the content of 50%; 4) regenerating the ion exchange resin with hydrochloric acid through resin, and then flushing with pure water. The production method of the calcium hypophosphite comprises the following steps: 1) preparing lime milk; 2) neutralizing; 3) filtering and removing impurities; 4) performing vacuum concentration to obtain phosphorus-containing vacuum water; 5) cooling and crystallizing; 6) performing centrifuge dripping to obtain mother liquor of the calcium hypophosphite; 7) drying filter cake subjected to centrifuge dripping to obtain a calcium hypophosphite finished product and packaging; 8) reusing the mother liquor. The production method disclosed by the invention has the advantages that the production cost of the hypophosphorous acid is greatly reduced; the energy consumption such as steam and electric power is reduced; the product quality is reliable and the process is simple; the production capacity of a hypophosphorous acid concentrating device can be greatly improved.

Description

technical field [0001] The invention proposes a low-cost production method for the co-production of hypophosphite calcium hypophosphite, which belongs to the technical field of chemical production. Background technique [0002] Hypophosphorous acid is an important industrial basic raw material and a strong reducing agent. It is usually used for the reduction of diazonium salts (diazonium removal) and the reduction and elimination of halogens on the aromatic rings of polynitro compounds. It can be used to prepare hypophosphites such as sodium hypophosphite and calcium hypophosphite, and is widely used in industrial technical fields such as electroplating baths and pharmaceuticals. Calcium hypophosphite, also known as calcium hypophosphite, is mainly used as a flame retardant, chemical plating, food additive and animal nutrition, as well as in the manufacture of pharmaceuticals, antioxidants and analytical reagents. [0003] Hypophosphorous acid production methods in the prio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/165
CPCC01B25/165
Inventor 冯振华朱雪松刘仕通刘平高宏福
Owner 江苏和纯化学工业有限公司
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