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Method for producing sodium hexametaphosphate by sodium chloride method

A technology of sodium hexametaphosphate and sodium chloride, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve the problems of large impact on production costs, and achieve the advantages of reducing production costs, short production process and simple equipment. Effect

Inactive Publication Date: 2009-06-24
HUBEI XINGFA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production cost is greatly affected by the price of raw material soda ash

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Take 9.85g of 85% phosphoric acid and 5.0g of sodium chloride to make a slurry, gradually heat it in a porcelain evaporating dish until no hydrochloric acid escapes, put it into a muffle furnace for melting and polymerization at 650°C-700°C for 30 minutes, and then take out the slurry Cold into glass, broken into sodium hexametaphosphate, containing P 2 o 5 67.7%.

Embodiment 2

[0014] Take 12.22g of 85% phosphoric acid and 6.2g of sodium chloride to make a slurry, gradually heat it in a porcelain evaporating dish until no hydrochloric acid escapes, put it in a muffle furnace for melting and polymerization at 650°C-700°C for 1 hour, and then take out the slurry Cold into glass, broken into sodium hexametaphosphate, containing P 2 o 5 68.1%.

Embodiment 3

[0016] Take 12.22g of 85% phosphoric acid and 6.2g of sodium chloride to make a slurry, gradually heat it in a porcelain evaporating dish until no hydrochloric acid escapes, put it into a muffle furnace for melting and polymerization at 650°C-700°C for 2 hours, then take out the slurry Cold into glass, broken into sodium hexametaphosphate, containing P 2 o 5 68.3%.

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Abstract

The invention provides a method for producing sodium hexametaphosphate by a sodium chloride method, which comprises that: according to the mol ratio of 1:1, sodium chloride and phosphoric acid are evenly mixed and subjected to melt polymerization at a temperature of between 650 and 700 DEG C for at least 30 minutes so as to completely remove chlorine hydride; and the product is subjected to quenching to be glassy so as to obtain the finished product of the sodium hexametaphosphate. In the method, the sodium chloride which is a low-priced and easily-bought raw material replaces sodium carbonate; moreover, the chlorine hydride is reclaimed so as to lower the production cost. The method has the advantages of short production flow, simple equipment, convenient operation and easy realization of industrialized production, and the P2O5 content in the sodium hexametaphosphate prepared by the method reaches more than 67.5 percent.

Description

technical field [0001] The invention relates to a method for producing sodium hexametaphosphate, in particular to a method for producing sodium hexametaphosphate by a sodium chloride method. Background technique [0002] There are one-step and two-step production processes for the industrial production of sodium hexametaphosphate, and the two-step production process is currently used in my country. There are three kinds of two-step production processes: (1) Phosphoric anhydride method, (2) Sodium dihydrogen phosphate method, (3) Phosphorus iron method. Now most of the six-bias manufacturers use the second method, that is, sodium dihydrogen phosphate method. The method uses soda ash (sodium carbonate) and phosphoric acid as raw materials to obtain finished products through neutralization, dehydration and polymerization. The technological process of this method should be relatively simple and easy, and the operability is strong, and the quality of the produced product is als...

Claims

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Application Information

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IPC IPC(8): C01B25/445
Inventor 盛美娥张伟刚余有平
Owner HUBEI XINGFA CHEM GRP CO LTD
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