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Method for preparing high-purity sodium hypophosphite

A technology of sodium hypophosphite and hypophosphorous acid, applied in the directions of hypophosphorous acid and phosphorus oxyacid, can solve the problems of cumbersome production process and high production cost, and achieve the effect of obvious purification effect, simplifying production process and reducing equipment investment.

Inactive Publication Date: 2011-04-20
JIANGSU DANAI CHEM
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Problems solved by technology

Then concentrate and crystallize, the content of sodium hypophosphite produced is 102-103%, the production process is loaded down with trivial details, and the production cost is high

Method used

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  • Method for preparing high-purity sodium hypophosphite
  • Method for preparing high-purity sodium hypophosphite

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Embodiment

[0014] 1. Put yellow phosphorus, lime, 32% ion-exchange membrane caustic soda and water into the reactor at the ratio of 100:70:290:500, and the synthesis reaction is completed at a temperature of 45℃-92℃ for about 1 hour. Obtain sodium hypophosphite solution and calcium phosphite precipitation, take the clear solution and measure 0.06mg / L of sulfate ion. Use ion-exchange membrane caustic soda to reduce the content of chloride and sulfate ions in the product.

[0015] 2. Put the finished material liquid into a stirred storage tank and add 100 kg of prepared barium hypophosphite at the ratio of barium to sodium hypophosphite at a ratio of 1:10. At the same time, add 100 to the crystallized mother liquor. The kilograms are put into the storage tank and stirred for 10 minutes, and then filtered through a filter press. The measured sulfate is 0.004mg / L.

[0016] 3. The filtered clear liquid is carbonized with carbon dioxide in the carbonization kettle, and the calcium content is cont...

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Abstract

The invention provides a method for preparing high-purity sodium hypophosphite, which comprises the following processing steps: matching materials, wherein, the high-purity sodium hypophosphite is prepared from the following components according to proportioning by weight: 100 portions of yellow phosphorus, 70 portions of lime, 290 portions of ionic-membrane caustic soda and 500 portions of water;evenly mixing the components and reacting to obtain sodium hypophosphite solution and calcium phosphate precipitation; adding barium hypophosphate prepared from hypophosphorous acid and barium carbonate to the sodium hypophosphite solution, and evenly mixing the solution; improving the purity of the product solution by a method of adding powdered activated carbon for decoloring and adsorbing chloride ions; filtering with a membrane filtering machine with the pore diameter being 0.2 mum, so as to trap the tiny impurities; and additionally arranging a spraying system on a centrifuge and washingcrystals with de-ionized water solvent. The invention has the advantages that the crystals are sprayed and washed at the time of centrifugal separation, and the mother solution adhered to the surfaces of the crystals can be washed away, thereby ensuring the obvious purification effect; the method can remove the cumbersome and low-efficiency preparation process, simplify the preparation process and reduce the preparation cost; and the content of the product can reach 103.56%.

Description

Technical field [0001] The invention relates to a method for preparing high-purity sodium hypophosphite. It uses yellow phosphorus, lime, and ion-exchange membrane caustic soda as raw materials to prepare high-purity sodium hypophosphite through chemical precipitation, physical adsorption, and washing of crystal surfaces . Background technique [0002] The prior art uses ion-exchange membrane caustic soda instead of soda ash for synthesis, and uses barium hypophosphite solution to remove sulfate ions, adds adsorbent activated carbon after concentration, and the final product content is 100%-101%. Some technologies use industrial grade sodium hypophosphite as raw material, dissolve it with water, and add precipitation agent to remove impurities. Then it is concentrated and crystallized, and the content of sodium hypophosphite produced is 102-103%. This production process is complicated and the production cost is high. Summary of the invention [0003] The present invention propos...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/165
Inventor 潘志放许红兰徐冬菇
Owner JIANGSU DANAI CHEM
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