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Process for purifying sodium hypophosphite

A technology of sodium hypophosphite and product quality, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., can solve the problems of unsatisfactory requirements in places with higher requirements, turbid aqueous solution, low filtration accuracy, etc., to ensure stability and product quality. Improve and enhance the effect of product quality

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

[0004] 1. Control the sulfate content in the finished product by controlling the quality of raw materials. The sodium hypophosphite product produced by this method has a sulfate content greater than 0.006%, which cannot meet the requirements for places with higher requirements
[0005] 2. The acid seasoning liquid is filtered with a plate frame or a cloth bag, the filtration accuracy is low, and impurities penetrate the filter cloth and directly enter the finished product of sodium hypophosphite, resulting in turbidity in the aqueous solution of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get raw material yellow phosphorus 100Kg, liquid caustic soda 239Kg, unslaked lime 70Kg and the water 1000Kg that production batching is used,

[0028] Put it in the reactor, chemical reaction:

[0029] CaO+H 2 O→Ca(OH) 2

[0030] Main reaction: P 4 +3NaOH+3H 2 O→3NaH 2 PO 2 +PH 3 ↑

[0031] Side effects: P 4 +3NaOH+3H 2 O→3Na 2 HPO 3 +PH 3 ↑

[0032] Ca 2+ +HPO 3 2- →CaHPO 3 ↓

[0033] Ca 2+ +CO 3 2- →CaCO 3 ↓.

[0034] Filtration, reaction filtrate: calcium content (Ca 2+ )3 2- ) < 3mg / ml; the acid adjustment solution is filtered by a filter with a pore size of 15 microns;

[0035] Concentrated for the first time, the concentration is 26 Pomi degrees; calcium content (Ca 2+ )3 2- )4 2- );

[0036] Chemical reaction for sulfate removal: BaCO 3 +2H 3 PO 2 →Ba(H 2 PO 2 ) 2 +H 2 O+CO 2 ↑Ba(H 2 PO 2 ) 2 +SO 4 2- → BaSO 4 ↓+2H 2 PO 2 - ;

[0037] Adjustment, alkali adjustment section: calcium content (Ca 2+ )3 2- )<15mg / ml; ...

Embodiment 2

[0043] Get raw material yellow phosphorus 100Kg, liquid caustic soda 240Kg, unslaked lime 80Kg and the water 1000Kg that production batching is used,

[0044] Put it in the reactor, chemical reaction:

[0045] CaO+H 2 O→Ca(OH) 2

[0046] Main reaction: P 4 +3NaOH+3H 2 O→3NaH 2 PO 2 +PH 3 ↑

[0047] Side effects: P 4 +3NaOH+3H 2 O→3Na 2 HPO 3 +PH 3 ↑

[0048] Ca 2+ +HPO 3 2- →CaHPO 3 ↓

[0049] Ca 2+ +CO 3 2- →CaCO 3 ↓

[0050] Filtration, reaction filtrate: calcium content (Ca 2+ )3 2- ) < 3mg / ml; the acid adjustment solution is filtered with a filter with a pore size of 5 microns;

[0051] Concentrated for the first time, the concentration is 28 Po US degrees; calcium content (Ca 2+ )3 2- )4 2- );

[0052] Chemical reaction for sulfate removal: BaCO 3 +2H 3 PO 2 →Ba(H 2 PO 2 ) 2 +H 2 O+CO 2 ↑Ba(H 2 PO 2 ) 2 +SO 4 2- → BaSO 4 ↓+2H 2 PO 2 - ;

[0053] Adjustment, alkali adjustment section: calcium content (Ca 2+ )3 2- )<15mg / ml;...

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PUM

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Abstract

The invention relates to a purification method of sodium hypophosphite product, which includes the following technical steps: (1) material proportioning, (2) chemical reaction, (3) filtering, (4) concentration for first time, the concentration being 26-28 Baume degrees, (5) base adjustment working section and acid adjustment working section, (6) concentration for second time, materials being concentrated to 48.6-48.7 Baume degrees after being heated by steam; (7) cooling, crystallization, centrifugation and packaging. The purification method of the invention has the advantages that: the quality of the sodium hypophosphite product is greatly improved by adopting cheap barium salt to remove the sulfate in feed liquid and the stability of product quality is also guaranteed; acid adjusting filtrate is filtered by a filter with the pore diameter of 5-15 microns instead of a cloth filter, thus eliminating the tiny impurities in the water solution of the product and further improving the quality of the product.

Description

technical field [0001] The invention relates to a method for purifying sodium hypophosphite product quality, and belongs to the technical field of sodium hypophosphite product production. Background technique [0002] Sodium Hypophosphite, also known as Sodium Hypophosphite: SHPP / HYPO for short. Molecular formula: NaH 2 PO 2 .H 2 O, molecular weight: 105.99. Appearance: pearly crystal or white crystalline powder. Odorless, salty, strong water absorption, easy to deliquescence, soluble in water and glycerin. The aqueous solution is neutral, and it will decompose rapidly when heated above 200°C, releasing toxic phosphine gas which can spontaneously combust. It is an inorganic hypophosphite with strong reducibility and can explode when in contact with strong oxidants. [0003] The purification method of the sodium hypophosphite product quality that adopts at present: [0004] 1. Control the sulfate content in the finished product by controlling the quality of raw materi...

Claims

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Application Information

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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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