Method for preparing high-purity stannous pyrophosphate

A stannous pyrophosphate, high-purity technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve problems such as difficult washing removal, large washing water consumption, easy hydrolysis of tin ions, etc.

Inactive Publication Date: 2013-03-06
GUANGXI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current method for preparing stannous pyrophosphate is to use stannous chloride or stannous sulfate to undergo metathesis reaction with alkali metal pyrophosphate to generate insoluble stannous pyrophosphate precipitate, which is washed, filtered and dried to obtain pyrophosphate For tin products, such as the patent application whose publication number is CN101234757A and titled "Method for preparing stannous pyrophosphate", because the soluble stannous ion used in the preparation process is easily oxidi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Embodiment one: a kind of method for preparing high-purity stannous pyrophosphate comprises the following steps:

[0022] (1) Dissolve soluble stannous chloride and soluble potassium pyrophosphate respectively in deionized water after degassing to obtain a concentration of 1.5mol. L -1 The stannous chloride solution and the concentration is 0.5mol. L -1 Potassium pyrophosphate solution, remove the air in the stannous chloride solution, potassium pyrophosphate solution and the reactor by vacuuming, according to the ratio of the amount of substance Sn 2+ :P 2 o 7 4- =1:0.5, under the condition of isolating the air and the temperature is 50°C, drop the stannous chloride solution into the potassium pyrophosphate solution, stir the two solutions to mix and react, then leave the closed reactor to cool to room temperature, filter, Wash, centrifuge and throw away the precipitate obtained in the reaction;

[0023] (2) Add PH=2 pyrophosphoric acid aqueous solution into t...

Embodiment 2

[0024] Embodiment two: a kind of method for preparing high-purity stannous pyrophosphate comprises the following steps:

[0025] (1) Dissolve soluble stannous chloride and soluble sodium pyrophosphate respectively in freshly prepared distilled water to obtain a concentration of 2mol. L -1 The tin protochloride solution and the concentration is 1mol. L -1 Sodium pyrophosphate solution, vacuumize the air in the stannous chloride solution, sodium pyrophosphate solution and the reactor, according to the amount of substance than Sn 2+ :P 2 o 7 4- =1:0.51, under the condition of isolating the air and the temperature is 80°C, drop the tin protochloride solution into the sodium pyrophosphate solution, stir the two solutions to mix and react, then leave the closed reactor to cool to room temperature, filter, Wash, centrifuge and throw away the precipitate obtained in the reaction;

[0026] (2) Add PH = 4 pyrophosphoric acid aqueous solution into the reactor, pump out the air in...

Embodiment 3

[0027] Embodiment three: a kind of method for preparing high-purity stannous pyrophosphate comprises the following steps:

[0028] (1) Dissolve soluble stannous chloride and soluble potassium pyrophosphate respectively in degassed distilled water to obtain a concentration of 4mol. L -1 The tin protochloride solution and the concentration is 1mol. L -1 Potassium pyrophosphate solution, remove the air in the stannous chloride solution, potassium pyrophosphate solution and the reactor by vacuuming, according to the ratio of the amount of substance Sn 2+ :P 2 o 7 4- =1:0.52, under the condition of isolating the air and temperature at 65°C, drop the tin protochloride solution into the potassium pyrophosphate solution, stir the two solutions to mix and react, then leave the closed reactor to cool to room temperature, filter, Wash with PH=2 pyrophosphoric acid aqueous solution, centrifuge and throw away the precipitate obtained from the reaction;

[0029] (2) Add PH = 2 pyrop...

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PUM

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Abstract

The invention relates to a method for preparing high-purity stannous pyrophosphate. The method comprises the following steps of using water with air removed to respectively dissolve soluble stannous salt and soluble pyrophosphate, vacuumizing to remove air in solution and a reactor, controlling the temperature to be between 50 and 80 DEG C, and under stirring, mixing the two kinds of raw material solution to react; then sealing the reactor, cooling the reactant to room temperature, filtering the reactant, washing the deposit, and centrifuging the deposit to dry the deposit; and adding the deposit into water to disperse the deposit, pumping the air, controlling the temperature to be between 50 and 80 DEG C, stirring, washing, cooling the reactant to room temperature, filtering andcentrifuging the deposit to dry the deposit, and drying the deposit in vacuum to obtain a high-purity white powered stannous pyrophosphate product. The stannous pyrophosphate content in the stannous pyrophosphate product is greater than 99 percent. The stannous pyrophosphate prepared by the method is high in purity, large in crystalline grains and easy to wash. The method is simple and convenient to popularize and use.

Description

technical field [0001] The invention relates to a method for preparing stannous pyrophosphate, in particular to a method for preparing high-purity stannous pyrophosphate. Background technique [0002] Stannous pyrophosphate is mainly used in electroplating industry and toothpaste manufacturing industry, but also in paint industry, printing and dyeing industry, leather manufacturing industry and food industry. The current method for preparing stannous pyrophosphate is to use stannous chloride or stannous sulfate to undergo metathesis reaction with alkali metal pyrophosphate to generate insoluble stannous pyrophosphate precipitate, which is washed, filtered and dried to obtain pyrophosphate For tin products, such as the patent application whose publication number is CN101234757A and titled "Method for preparing stannous pyrophosphate", because the soluble stannous ion used in the preparation process is easily oxidized by air, the content of tetravalent tin in stannous pyrophos...

Claims

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Application Information

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IPC IPC(8): C01B25/42
Inventor 吴洪达赵略
Owner GUANGXI UNIVERSITY OF TECHNOLOGY
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