Method for producing calcium hypophosphite

A calcium hypophosphite and production method technology, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of large equipment investment, long and complicated production process route, etc., and achieve simple production principle, less equipment investment and high quality of finished products Effect

Active Publication Date: 2008-12-31
江苏和纯化学工业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production process of this method is long and complicated, and the investment in equipment is large. Inflammable and explosive phosphine gas is produced during the reaction process. The final calcium hypophosphite product has a high impurity content, and the main content is difficult to reach more than 99.0%. , places with higher quality requirements cannot be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Ingredients: Add 1000KG deionized into the ash bucket, add 40KG quicklime powder (effective calcium oxide content > 88%) under stirring conditions, stir for 30 minutes, pump lime milk into the first neutralization reaction In the kettle, start the reactor to stir.

[0016] The first neutralization reaction: Start the stirring of the reaction kettle, and under the condition of constant stirring, add hypophosphorous acid with a concentration of 50% into the reaction kettle, neutralize the acid and alkali until the pH value of the lime emulsion is 9.0, stop adding the concentration of 50% Hypophosphorous acid, continue to stir, and measure the pH value every 15 minutes. If the pH value is > 9.5, add hypophosphorous acid with a concentration of 50% until the pH does not change within the range of 9.0 to 9.5 within 90 minutes. Neutralize for the first time Reaction finishes, stops stirring;

[0017] The second neutralization reaction: filter the feed liquid after the first ...

Embodiment 2

[0024] Ingredients: Add 1000KG deionized into the ash bucket, add 40KG quicklime powder (effective calcium oxide content > 88%) under stirring conditions, stir for 30 minutes, pump lime milk into the first neutralization reaction In the kettle, start the reactor to stir.

[0025] The first neutralization reaction: Start the stirring of the reaction kettle, and under the condition of constant stirring, add hypophosphorous acid with a concentration of 50% into the reaction kettle, and react with acid and alkali until the pH value of the lime emulsion is 9.5, and stop adding the concentration of 50% Hypophosphorous acid, continue to stir, and measure the pH value every 15 minutes. If the pH value is > 9.5, add hypophosphorous acid with a concentration of 50% until the pH does not change within the range of 9.0 to 9.5 within 90 minutes. Neutralize for the first time Reaction finishes, stops stirring;

[0026] The second neutralization reaction: filter the feed liquid after the fi...

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Abstract

The invention relates to the production method of calcium hypophosphite; the production method includes the following technical steps: 1. material preparing which is detailed as follows: deionized water is firstly added in a mixer, unslaked lime powder, the weight of which accounts for 4% of the deionized water, is added under the stirring condition to prepare lime cream, and the lime cream is pumped into a reaction kettle by a pump, ready for use; 2. first neutralization reaction; 3. second neutralization reaction; 4. concentration which is detailed as follows: a vacuum pump of a concentration kettle is started, the filtrate from the second neutralization reaction is pumped into the concentration kettle in virtue of the vacuum in the kettle and is concentrated at vacuum condition after a steam valve is opened; 5. drying and packaging step is detailed as follows: the materials are put in a centrifuge for spin drying when the temperature of the feed liquid in a cooling kettle is below 60 DEG C to obtain the finished product with 92-95% of calcium hypophosphite, then the material is put into a dryer and dried for 20-25 min by the hot air with the temperature of 60-80 DEG C to obtain refined calcium hypophosphite finished product with the content of over 99.0 %. The production method has the advantages of low equipment investment, short process flow and simple production principle. Due to high quality, the finished product produced can be used as food additive, pharmaceuticals and chemical agents.

Description

technical field [0001] The present invention relates to a method for producing calcium hypophosphite. The calcium hypophosphite produced by the method is of good quality and is mainly used as a food additive and animal nutrition agent, used in the manufacture of medicines, and can be used as an antioxidant and analytical reagent . The invention belongs to the technical field of calcium hypophosphite production. Background technique [0002] Calcium hypophosphite is white crystalline granule or powder, English name: Calcium hypophosphite. Molecular formula: Ca(H 2 PO 2 ) 2 , relative molecular mass: 170.06. Alias: calcium dihydrogen hypophosphite, calcium hypophosphite, calcium base phosphate. Soluble in water, insoluble in alcohol, the solubility at room temperature is: 100 grams of water can dissolve 16.7 grams, and its aqueous solution is weakly acidic. Yellow phosphorus can be directly used as raw materials for production. The specific method is: yellow phosphorus,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/165
Inventor 冯振华朱康洋
Owner 江苏和纯化学工业有限公司
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