Preparation of potassium iodate

A manufacturing method, the technology of potassium iodate, applied in the direction of iodine oxygen compound, etc., can solve the problems of high ion membrane, high product impurities, high production cost, etc., and achieve the effect of simple and safe operation, high product purity, and low equipment requirements

Active Publication Date: 2007-02-07
XILONG SCI CO LTD
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  • Summary
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Potassium chlorate oxidation and concentrated nitric acid oxidation produce a large amount of harmful gas chlorine and nitrogen dioxide, and because of the volatilization of iodine due to heating reaction, the conversion rate of iodine is low
The actual consumption of hydrogen peroxide in the hydrogen peroxide oxidation method is twice the theoretical amount, and the cost is relatively high
The electrolysis method needs to add dichromic acid to reduce the current efficiency and reduce side reactions. The product has more impurities and chromium pollution. The electrolysis method has higher requirements for the ion membrane, complex equipment, and higher production costs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] In 23 kilograms of potassium hydroxide aqueous solution of weight content 30% and 50 kilograms of water, add 6 kilograms of iodines in batches under stirring, exothermic reaction takes place between iodine and potassium hydroxide:

[0018] Control the adding rate of iodine so that the temperature of the system is kept below 45° C. After the system is clarified, the reaction system becomes a mixed aqueous solution of potassium iodate, potassium iodide and a small amount of potassium hydroxide.

[0019] Then reaction system is heated to 90 ℃, feeds chlorine gas to reaction system, drops the potassium hydroxide aqueous solution of weight content 30% simultaneously, and chlorine gas and potassium iodide generation exothermic reaction:

[0020] The rate of addition of potassium hydroxide is to keep the pH value of the reaction system between 7.5-8.5. After detecting that the iodide ions are consumed, stop adding potassium hydroxide aqueous solution, and continue t...

Embodiment 2

[0025] Dissolve 6.5 kilograms of potassium iodide in 50 kilograms of water, heat to 90 ° C, feed chlorine gas, and add dropwise an aqueous solution of potassium hydroxide with a weight content of 30%, chlorine gas and potassium iodide have an exothermic reaction:

[0026] The rate of addition of potassium hydroxide is to keep the pH value of the reaction system between 7.5-8.5. After detecting that the iodide ions are consumed, stop dripping the potassium hydroxide aqueous solution and continue to feed chlorine until the pH value of the solution shows neutrality. The step needs about 8.3 kilograms of chlorine gas and 30 kilograms of potassium hydroxide solution.

[0027] After the reaction, 2.4 kg of hydrochloric acid with a weight content of 36% HCl was added, stirred and cooled to room temperature, filtered, and the solid was washed with a small amount of distilled water to obtain a crude product of potassium hydrogen iodate.

[0028] The above crude product of potassi...

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PUM

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Abstract

Production of potassium iodate from chlorine oxidation is carried out by oxidizing potassium iodide to generate potassium iodate in weak base medium, controlling pH of reacting system between 7-10 and temperature 60-100 DEG C, and separating the product from concentrated chlorhydric acid. It achieves simple operation, high purity and safety.

Description

technical field [0001] The present invention relates to the manufacture method of potassium iodate, particularly the method that potassium iodide is oxidized to generate potassium iodate. Background technique [0002] The manufacturing methods of potassium iodate in industry include potassium chlorate oxidation method, concentrated nitric acid oxidation method, hydrogen peroxide oxidation method and electrolysis method. Potassium chlorate oxidation method and concentrated nitric acid oxidation method produce a large amount of harmful gas chlorine and nitrogen dioxide, and because of the volatilization of iodine caused by heating reaction, the conversion rate of iodine is low. The hydrogen peroxide actually consumed by the hydrogen peroxide oxidation method is twice the theoretical amount, and the cost is relatively high. The electrolysis method needs to add dichromic acid to reduce the current efficiency and reduce side reactions. The product has more impurities and chromiu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B11/22
Inventor 刘志平黄伟鹏
Owner XILONG SCI CO LTD
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