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Preparation method of stannous chloride

A technology of stannous chloride and hydrochloric acid, applied in stannous chloride, tin halide and other directions, can solve the problems of complex preparation process of stannous chloride, volatilization of hydrochloric acid, serious pollution, etc., to reduce volatilization and corrosion of equipment, The effect of reducing volatilization and simple preparation method

Inactive Publication Date: 2013-01-02
YUNNAN TIN
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing stannous chloride preparation process such as complex, high cost, volatilization of hydrochloric acid and serious pollution, and provide an improved method for preparing stannous chloride, which has the advantages of simple preparation process, The advantages of fast reaction rate, low cost, less volatilization of hydrochloric acid, less corrosion of hydrochloric acid, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Add 200 g metal tin flower into the glass reactor, then add 25% hydrochloric acid into the reactor, then put the reactor into the ultrasonic instrument, adjust the ultrasonic frequency to 100W, and react at room temperature for 4 h; Concentrate the stannous chloride solution formed by evaporation until the temperature of the concentrated solution reaches 136 °C, then pour out the concentrated solution and crystallize at room temperature; filter the obtained crystals under reduced pressure, and dry the filter cake in vacuum at 80 °C for 12 h , to obtain stannous chloride crystals. The conversion rate of metallic tin is 51.41%.

Embodiment 2

[0017] 200 g metal tin flowers are added in the glass reactor, then 27% hydrochloric acid is added in the reactor, then the reactor is put into the sonicator, and the ultrasonic frequency is adjusted to be 100W, and the ultrasonic frequency 20kHZ is reacted at room temperature for 6 h; Concentrate the stannous chloride solution formed by atmospheric pressure evaporation until the temperature of the concentrated solution reaches 136°C, then pour out the concentrated solution and crystallize at room temperature; filter the obtained crystals under reduced pressure, and vacuum the filter cake at 80°C After drying for 12 h, stannous chloride crystals were obtained. The conversion rate of metallic tin was 59.15%.

Embodiment 3

[0019] Add 200 g metal tin flower into the glass reactor, then add 30% hydrochloric acid into the reactor, then put the reactor into the ultrasonic instrument, adjust the ultrasonic frequency to 300W, the ultrasonic frequency to 20kHZ, and react at room temperature for 6 h Concentrate the stannous chloride solution formed by atmospheric pressure evaporation until the temperature of the concentrated solution reaches 136°C, then pour out the concentrated solution and crystallize at room temperature; filter the obtained crystals under reduced pressure, and filter the cake at 80°C After vacuum drying for 12 h, stannous chloride crystals were obtained. The conversion rate of metallic tin is 67.18%.

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Abstract

The invention relates to a preparation method of stannous chloride, and belongs to the technical field of inorganic stannum preparation. The method comprises the following steps: carrying out one-step synthesis of a stannous chloride solution through applying supersonic waves having frequencies of 20-30kHZ to raw materials comprising metallic stannum flowers and hydrochloric acid having a concentration of 25-34wt%, and concentrating and crystallizing to obtain colorless and transparent stannous chloride crystals. The method provided by the invention, which introduces the supersonic waves to the reaction process, overcomes disadvantages of high reaction temperature, large hydrochloric acid volatilization amount and long reaction time of present stannous chloride preparation technologies, has the advantages of low cost, low acid consumption, fast reaction rate, less hydrochloric acid volatilization and easy industrialization, and has a bright application prospect.

Description

technical field [0001] The invention relates to a preparation method of tin protochloride, which belongs to the technical field of inorganic tin preparation. technical background [0002] Tin protochloride (SnCl2·2H2O) is an important chemical raw material and chemical product, widely used in industries such as dyes, spices, mirror making, electroplating, ultra-high pressure lubricating oil, bleaching, etc., and used as a reducing agent, mordant, decolorization Reagents and analytical reagents for the determination of silver, arsenic, molybdenum, mercury, etc. The current market demand is increasing year by year. The preparation method of traditional stannous chloride is to react with metal tin and hydrochloric acid, evaporate and concentrate crystallization then, separate stannous chloride crystal. In this process, if the reaction speed of hydrochloric acid and metal tin is extremely slow at room temperature (about 25°C), the reaction time will be longer. At the same tim...

Claims

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Application Information

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IPC IPC(8): C01G19/06
Inventor 胡洋李伟段富良郭应辉贾庆明何兴
Owner YUNNAN TIN
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