Refining method for removing chlorate from perchlorate

A perchlorate and refining method technology, applied in the direction of perchlorate, perchloric acid, etc., can solve the problems of failing to meet the quality requirements of fireworks products and national high-quality products

Inactive Publication Date: 2004-07-28
吴建国 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

And the content of chlorate in the national high-quality product can only be below 0.02%, and the content of chlorate in the fireworks products of countries such as Europe and the United States is required to be lower than 0.003%, so the existing refining method can not reach the requirement of national high-quality product, It cannot meet the quality requirements of fireworks products in Europe and the United States.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 5 tons of potassium perchlorate crude product, which contains 0.1% chlorate (calculated as chlorine), in the refining process, 30 kg of potassium metabisulfite is added to the solution to make it chemically react with chlorate to decompose chlorate into easily The compound is soluble in water, and the perchlorate in the product does not react with the compound, and a small amount of acid produced by the reaction is added to solid KOH to adjust the pH value of the solution to 7. The solution is cooled and crystallized, and after the product is dried and pulverized, the chlorate content is detected to be 0.002%. The treated solution is returned to the electrolytic cell as circulating mother liquor.

Embodiment 2

[0013] 2 tons of sodium perchlorate crude product, which contains 0.2% chlorate (calculated as chlorine), in the refining process, 50 kg of sodium metabisulfite is added to the solution to make it chemically react with chlorate to decompose chlorate into easily The compound is soluble in water, and the perchlorate in the product does not react with the compound, and a small amount of acid produced by the reaction is added to 50% KOH to adjust the pH value of the solution to 8. The solution is cooled and crystallized, and after the product is dried and pulverized, the chlorate content is detected to be 0.002%. The treated solution is returned to the electrolytic cell as circulating mother liquor.

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Abstract

The present invention discloses a refining process for removing chlorate from perchlorate. According to the content of chlorate in the perchlorate the stoichiometric metasulfite solution or solid can be added, and reacted with chlorate to decompose the chlorate into the compound which can be easily dissolved in water. The perchlorate in the product does not produce reaction with said compound, and the small quantity of acid produced by reaction can be neutralized by alkali to make pH value of solution be 7-9, the content of chlorate in the perchlorate can be controlled in below 0.003% (by chloride) so as to reach to the index of high-quality product.

Description

technical field [0001] The invention relates to a refining method for removing chlorate from perchlorate. Background technique [0002] The existing production method of perchlorate mostly adopts the technique of electrolyzing saturated solution of chlorate. The perchlorate produced by this method often contains a certain amount of chlorate. The existing method for removing chlorate is to recrystallize the crude product of perchlorate, but the perchloric acid in this refining method product Salt (calculated as chlorine) is still as high as 0.4%, which is stated in Volume 11 of the Chinese Chemical Encyclopedia. And the content of chlorate in the national high-quality product can only be below 0.02%, and the content of chlorate in the fireworks products of countries such as Europe and the United States is required to be lower than 0.003%, so the existing refining method can not reach the requirement of national high-quality product, More can not rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/18
Inventor 吴建国罗建梁易建新
Owner 吴建国
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