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Method for reducing stannic chloride

A technology of tin tetrachloride and tin protochloride, which is applied in the direction of tin protochloride and tin halide, can solve the problems of secondary pollution, and achieve the effects of low cost, reasonable synthesis process and environmental friendliness

Inactive Publication Date: 2013-02-06
HEFEI XINGYU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Produced iron sludge and ferric chloride wastewater, forming secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1, a kind of method for reducing tin tetrachloride, this method uses aluminum as reducing agent; Its specific steps are as follows: under the corrosion-resistant equipment that tail gas induced draft emptying system, stirrer are housed, add and utilize The dilute hydrochloric acid solution of tin tetrachloride produced by tin reduction of diazonium salt, start stirring, slowly raise the temperature and slowly add aluminum particles (specification: φ0.6mm-φ0.8mm) at 25°C Reaction: detect that there is no After the divalent tin is dried by centrifugation, the reaction is completed, and the elemental tin is obtained.

Embodiment 2

[0017] Embodiment 2, a kind of method for reducing tin tetrachloride, this method uses aluminum as reducing agent; Its specific steps are as follows: under the corrosion-resistant equipment that tail gas induced draft emptying system, stirrer are housed, add and utilize The dilute hydrochloric acid solution of tin tetrachloride produced by tin reduction of diazonium salt, start stirring, slowly raise the temperature and slowly add aluminum particles (specification: φ0.8mm-φ1.0mm) at 35°C Reaction: detect that there is no After the divalent tin is dried by centrifugation, the reaction is completed, and the elemental tin is obtained.

Embodiment 3

[0018] Embodiment 3, a kind of method for reducing tin tetrachloride, this method uses aluminum as reducing agent; Its specific steps are as follows: under the corrosion-resistant equipment that tail gas induced draft emptying system, agitator are housed, add and utilize The dilute hydrochloric acid solution of tin tetrachloride produced by tin reduction of diazonium salt, start stirring, slowly raise the temperature and slowly add aluminum particles (specification: φ1.0mm-φ1.2mm) at 40°C Reaction: detect that there is no After the divalent tin is dried by centrifugation, the reaction is completed, and the elemental tin is obtained.

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PUM

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Abstract

The invention discloses a method for reducing stannic chloride. Aluminum particles are taken as a reducing agent in the method. The method comprises the following specific steps: adding diluted hydrochloric acid solution of stannic chloride generated by reducing diazonium salt with stannous chloride into a corrosion-resistant device provided with a tail gas air induction emptying system and a stirrer; starting stirring; slowly heating up and slowly adding the aluminum particles at the temperature of 20-55 DEG C for reaction; centrifugally drying after no divalent stannum is detected in the solution; and obtaining simple substance stannum after the reaction is finished. According to the method, the disadvantages in the prior art are overcome, and the method is simpler, convenient and environment-friendly, low in cost and high in yield and is more beneficial to reducing stannic chloride in industrial production.

Description

technical field [0001] The invention relates to the technical field of a preparation method of tin protochloride, in particular to a method for reducing tin tetrachloride. Background technique [0002] In the prior art, the reduction of the diazonium salt can be reduced with sodium sulfite or stannous chloride. However, the yield of sodium sulfite reduction is generally only about 75%, and the treatment of waste water is relatively difficult, while the reduction of diazonium salt with stannous chloride in excess hydrochloric acid can be carried out almost quantitatively. as follows: [0003] Ar-N-N + -Cl - +2SnCl 2 +4HCl→Ar-NHNH 2 - HCl [0004] Therefore, considering the yield and manufacturing cost, the reduction of commonly used diazonium salts is all reduced with stannous chloride. In order to reclaim tin tetrachloride in the solution, in the prior art, tin tetrachloride is generally reduced to tin protochloride with iron powder, and then tin tetrachloride is obt...

Claims

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Application Information

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IPC IPC(8): C01G19/06
Inventor 王龙孙东艳赵邦斌
Owner HEFEI XINGYU CHEM
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