Method for restoring 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: 2011-07-06
LIANYUNGANG JINDUN AGROCHEMICAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to recover the tin tetrachloride in the solution, in the prior art, iron powder or aluminum powder is generally used to reduce tin tetrach

Method used

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  • Method for restoring stannic chloride
  • Method for restoring stannic chloride

Examples

Experimental program
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Example Embodiment

[0011] Example 1. A method for reducing tin tetrachloride, the method uses electricity as a reducing agent; the specific steps are as follows: add the use of stannous chloride to reduce diazonium in an electrolytic cell equipped with a tail gas treatment system, agitation and two metal electrodes The dilute hydrochloric acid solution of tin tetrachloride produced by the salt, stir and energize to 15A; slowly increase the temperature and react at 70°C; after detecting that there is no tetravalent tin in the solution, the reaction ends, and the dilute hydrochloric acid of stannous chloride is obtained Solution.

Example Embodiment

[0012] Example 2. A method for reducing tin tetrachloride, which uses electricity as a reducing agent; its specific steps are as follows: add it to an electrolytic cell equipped with a tail gas treatment system, stirring, a nickel electrode as the cathode, and a metal electrode with ruthenium, iridium and titanium as the anode The dilute hydrochloric acid solution of tin tetrachloride produced by the reduction of diazonium salt with stannous chloride, stir and energize to 22A; slowly increase the temperature and react at 65°C; after detecting that there is no tetravalent tin in the solution, the reaction ends, that is Obtain a dilute hydrochloric acid solution of stannous chloride.

Example Embodiment

[0013] Example 3. A method for reducing tin tetrachloride, which uses electricity as a reducing agent; its specific steps are as follows: add it to an electrolytic cell equipped with a tail gas treatment system, stirring, a nickel electrode as the cathode, and a metal electrode with iridium, tantalum, and titanium as the anode The dilute hydrochloric acid solution of tin tetrachloride produced by the reduction of diazonium salt with stannous chloride, stir and energize to 18A; slowly increase the temperature and react at 75°C; after detecting that there is no tetravalent tin in the solution, the reaction ends, that is Obtain a dilute hydrochloric acid solution of stannous chloride.

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Abstract

The invention provides a method for restoring stannic chloride, which is characterized in that the method takes electricity as reducing agent. The method comprises the following specific steps of: adding diluted hydrochloric acid solution which is used for restoring stannic chloride generated by diazonium salt by means of stannous chloride into an electrolytic cell which is provided with a tail gas treatment system, a stirring system and two negative/positive metal electrodes, stirring and electrifying to 15-25A; slowly rising the temperature and reacting under the temperature of 30-75 DEG C; and detecting that no tetravalent tin is existed in the solution, and ending the reaction to obtain the diluted hydrochloric acid solution of the stannous chloride. By using the electricity as the reducing agent in the reaction, the method reduces the dust pollution during production process in a manufacturing shop, is more environment-friendly, is safer, and reaches the international standard. The method is more reasonable in a synthesis technology and low in cost, and the reaction yield is higher than 98%, so that the method is more suitable for the industrial production.

Description

technical field [0001] The invention relates to a method for preparing stannous chloride, in particular to a method for preparing stannous chloride by 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 80%, and the treatment of waste water is relatively difficult, while the reduction of diazonium salt with stannous chloride in excess hydrochloric acid can be almost quantitatively carried out. as follows: [0003] [0004] Therefore, considering the yield and manufacturing cost, the reduction of commonly used diazonium salts is all reduced with stannous chloride. In order to recover the tin tetrachloride in the solution, in the prior art, iron powder or aluminum powder is generally used to reduce tin tetrachloride to stannous chloride, and the iron powder or aluminum powder is oxidized...

Claims

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Application Information

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IPC IPC(8): C01G19/06
Inventor 王耀良石卫兵
Owner LIANYUNGANG JINDUN AGROCHEMICAL CO LTD
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