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Preparation method of anhydrous stannous chloride

A technology of stannous chloride and its manufacturing method, which is applied in the direction of stannous chloride and tin halide, can solve the problems of high production cost, and achieve the effects of low production cost, easy control and convenient operation

Active Publication Date: 2010-03-10
云南锡业锡化工材料有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above methods are only limited to the laboratory method, and cannot solve the problems of equipment corrosion and environmental pollution in the expansion of production, and the production cost is high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 1 kg of crystalline stannous chloride dihydrate in a beaker, heat on an electric furnace, and carry out a period of concentrated drying. When a large amount of white crystals precipitate out of the material in the beaker, stop heating. The maximum temperature of the material in this process is 125°C. After cooling the material to 90°C, add 0.4g of organic dispersant, stir for 1min, and pour the material into the porcelain oven. Put it in a vacuum drying oven for two-stage vacuum drying, the drying temperature is 105°C, and the vacuum degree is 0.082MPa. When there are no obvious water drops on the sight glass of the vacuum drying oven, stop drying, take out the material, and cool to Normal temperature, carry out crushing, obtain 0.832kg anhydrous stannous chloride product, the main content of product is 99.18%, the solution is clear after dissolving in hydrochloric acid solution.

Embodiment 2

[0019] Weigh 1.5 kg of crystalline stannous chloride dihydrate in a beaker, heat on an electric furnace, and carry out a period of concentrated drying. When the material in the beaker has a large amount of white crystals, stop heating. The maximum temperature of the material in this process is 127°C. After cooling the material to 90°C, add 0.5g of organic dispersant, stir for 1min, and pour the material into the porcelain oven. Put it in a vacuum drying oven for two-stage vacuum drying, the drying temperature is 102°C, and the vacuum degree is 0.082MPa. When there are no obvious water droplets on the sight glass of the vacuum drying oven, stop drying, take out the material, and cool to Normal temperature, carry out crushing, obtain 1.250kg anhydrous stannous chloride product, the main content of product is 99.32%, the solution is clear after being dissolved in hydrochloric acid solution.

Embodiment 3

[0021] Weigh 450kg of crystalline stannous chloride dihydrate and put it into an enamel kettle, and heat it with steam. When the tin protochloride dihydrate is completely melted and starts to boil, start stirring, and carry out a period of concentrated drying. After concentration to a certain extent, white Crystallization, continue heating, add 110g organic dispersant when the material is very thick, continue stirring for 10 minutes, put the material into the receiving tank, then put it into the enamel baking tray, put it into the vacuum drying oven for drying, the drying temperature The temperature is 98°C, the vacuum degree is 0.078MPa, the vacuum is broken after drying for 3.5 hours, the material is taken out, cooled to room temperature, and crushed to obtain 375kg of anhydrous stannous chloride product with a main content of 99.24%. After dissolving in hydrochloric acid solution The solution is clear.

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Abstract

The invention relates to a preparation method of anhydrous stannous chloride, in particular to a large-scale production method of anhydrous stannous chloride, belonging to the technical field of the chemical engineer. The method of the invention is to use SnCl2.2H2O as raw material to perform two-stage drying, wherein in the first stage, the first stage drying is performed at normal pressure whilethe heating temperature is controlled to less than 130 DEG C, then organic dispersant is added, the second stage drying adopts vacuum drying, the drying temperature is controlled to 90-110 DEG C andthe vacuum degree is controlled to less than 0.075MPa. The invention has simple process flow and high product purity and is easy to control; and the method can use common chemical equipment and effectively solve the problem of equipment corrosion. The main content of the product prepared by the method is not less than 99% and the solution obtained by dissolving the product in hydrochloric acid solution is clear.

Description

technical field [0001] The invention relates to a method for producing an inorganic tin compound, in particular to a method for large-scale production of anhydrous stannous chloride, which belongs to the technical field of chemical industry. Background technique [0002] There are two forms of stannous chloride: anhydrous and containing two crystal waters. Crystalline stannous chloride has a low melting point and dissolves in its own crystal water at 37.7°C, and is easy to oxidize. It is quite stable, and its use is far more extensive than that of crystalline stannous chloride. Anhydrous subchloride has a strong reducing property and is widely used as a reducing agent in the manufacture of inorganic and organic compounds, printing and dyeing industry, and is widely used in immersion tin process and alloy electroplating. According to relevant data, the production method of anhydrous tin protochloride usually has the following several kinds: [0003] (1) with SnCl 2 2H 2 O...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G19/06
Inventor 刘路坷欧四梅张建国魏兵郭应辉
Owner 云南锡业锡化工材料有限责任公司
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