High grade sodium hypophosphite preparation method

A sodium hypophosphite, high-grade technology, applied in the direction of hypophosphorous acid, phosphorus oxyacid, etc., can solve the problem of high chloride ion content

Inactive Publication Date: 2006-04-26
NANKAI UNIV
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  • Summary
  • Abstract
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Problems solved by technology

The disadvantage of this process is that there is no arsenic removal process and the problem of high chloride ion content in the high-grade sodium hypophosphite product prepared by neutralization method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Take 250g NaH 2 PO 2 Dissolve in 500ml volumetric flask, prepare 33.33% (weight) sodium hypophosphite solution, use potentiometric titration to measure Cl in the solution - The content is 60μg / ml.

[0024] At room temperature, the preparation of Ag 2 SO 4 Saturated solution of: take 3.50g Ag 2 SO 4Dissolve, so that there are solids in the solution, take 250ml of supernatant for later use. Determination of Ag in solution by atomic absorption spectrometry + The content is 0.0463mol / 1. Take 200ml of NaH 2 PO 2 solution, adding Ag 2 SO 4 Saturated solution 8.0ml. Add 1 g of adsorbent activated carbon precipitated by AgCl to this solution, then stir, and then filter this solution after about 20 minutes to obtain a colorless, transparent solution, and the obtained NaH 2 PO 2 The chlorine content of the solution is between 3 μg / ml.

[0025] Take 100ml to remove Cl - after NaH 2 PO 2 Solution, measure SO in solution by turbidimetry 4 2- content. Preparation...

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Abstract

The present invention relates to the preparation process of high grade sodium hypophosphite. The preparation process with industrial level sodium hypophosphite as material and active carbon as adsorbent includes silver chloride precipitation to eliminate chlorine ion, barium sulfate precipitation to eliminate sulfate radical ion, sulfide precipitation to eliminate heavy metal ion, addition of small amount of high grade hypophosphorous acid to eliminate micro amount of arsenic, cationic exchanging to prepare high grade sodium hypophosphite solution, decompression enriching, cooling to crystallize, filtering and drying. The product has low contents of hypophosphorous acid, sulfate, chloride, iron and lead. The product may find its wide application in manufacture, electronic industry, national defense industry and other hi-tech fields.

Description

technical field [0001] The invention relates to a preparation method of high-grade sodium hypophosphite. It uses industrial-grade sodium hypophosphite as raw material to prepare high-grade sodium hypophosphite by removing chloride ions, sulfate ions, heavy metal ions, arsenic ions and calcium ions, etc., and using a cation exchange method. A method of sodium hypophosphite. Background technique [0002] Sodium hypophosphite is an ideal strong reducing agent, which is widely used in high-tech fields such as manufacturing, electronics industry, national defense industry, food industry, organic synthesis, and chemical and pharmaceutical synthesis industries. With the deepening of research and the large increase of its derivatives, its application field has been continuously expanded. At present, sodium hypophosphite has become an important inorganic salt product. Sodium hypophosphite is mainly used as a reducing agent for electroless plating on the surface of metal and non-meta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/165
Inventor 张宝贵郭爱红毕成良唐雪娇
Owner NANKAI UNIV
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