Method for preparing high-purity sodium hypophosphite

A pure sodium hypophosphite, sodium hypophosphite technology, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of cumbersome production process and high production cost, achieve obvious purification effect, simplify production process and reduce equipment investment.

Inactive Publication Date: 2009-10-14
JIANGSU DANAI CHEM
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Problems solved by technology

Then concentrate and crystallize, the content of sodium hypophosphite produced is 102-103%,

Method used

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  • Method for preparing high-purity sodium hypophosphite

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Embodiment

[0014] 1. Add yellow phosphorus, lime, 32% ion-exchange membrane caustic soda and water into the reaction kettle at a ratio of 100:70:290:500, and the reaction is completed at a temperature of 45°C-92°C for about 1 hour. Sodium hypophosphite solution and calcium phosphite precipitate were obtained, and the clear liquid was taken to measure sulfate ion 0.06mg / L. Use ionic membrane caustic soda to reduce the content of chloride ions and sulfate ions in the product.

[0015] 2. Pour the finished feed solution into a storage tank with stirring, and add 100 kg of barium hypophosphite that has been prepared at a ratio of 1:10 of barium:sodium, and add 100 kg of the crystallized mother liquor quantitatively at the same time. kg into the storage tank, stirred for 10 minutes, and filtered through a filter press. Measured sulfate radical 0.004mg / L.

[0016] 3. The filtered clear liquid is carbonized in the carbonization kettle to control the calcium content to 0.05mg / L.

[0017] 4. T...

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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 washing crystals 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 present invention relates to a method for preparing high-purity sodium hypophosphite, which 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 crystal surface washing. . Background technique [0002] The prior art is to replace soda ash with ionic membrane caustic soda for synthesis, and barium hypophosphite solution is used to remove sulfate ions, and after concentration, activated carbon is added as an adsorbent, and the final product content is 100%-101%. And some technologies use industrial grade sodium hypophosphite as raw material, add water to dissolve, add precipitant to remove impurities, etc. Then concentrate and crystallize again, the sodium hypophosphite content of production is 102-103%, this production process is loaded down with trivial details, and production cost is high. Contents of the inventi...

Claims

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Application Information

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IPC IPC(8): C01B25/165
Inventor 徐冬菇
Owner JIANGSU DANAI CHEM
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