A kind of method preparing potassium periodate

A technology of potassium iodate and potassium hydrogen iodate, which is applied in the direction of iodine oxygen compounds, can solve the problems of long operating hours, long working hours, and low efficiency, and achieve low equipment requirements, easy industrialization, and simple and safe preparation methods Effect

Active Publication Date: 2020-05-12
山东博苑医药化学股份有限公司
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  • Application Information

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Problems solved by technology

The disadvantage is that this is only a method of refining potassium iodate, which requires industrial potassium iodate as raw material, and high-cost iodic acid is used to adjust the pH. The working hours are long, the waiting time is 29-37h, and the operating time is longer. low efficiency

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  • A kind of method preparing potassium periodate
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preparation example Construction

[0033] a) Preparation of iodine-potassium iodide solution:

[0034] Dissolve crude iodine in potassium iodide solution to prepare iodine-potassium iodide solution;

[0035] b) Preparation of potassium hydrogen iodate:

[0036] Drop the iodine-potassium iodide solution prepared in step a) into the mixed solution of potassium chlorate and concentrated hydrochloric acid to obtain a potassium hydrogen iodate solution;

[0037] c) Preparation of potassium iodate:

[0038] The pH value of the potassium hydrogen iodate solution prepared in step b) is adjusted to 7-8 with potassium hydroxide, and potassium iodate is obtained by decolorization, crystallization, filtration and drying.

[0039] The above technical scheme uses crude iodine to prepare the iodine-potassium iodide solution, which solves the problem that the direct feeding of crude iodine cannot accurately measure the iodine content; the feeding method of dissolving and adding iodine is adopted to improve the solid iodine feeding. Chlo...

Embodiment 1

[0056] Preparation of iodine-potassium iodide solution:

[0057] Dissolve crude iodine in potassium iodide solution to prepare iodine-potassium iodide solution;

[0058] The molar ratio of crude iodine to potassium iodide solution is 1:1; the mass concentration of potassium iodide in the potassium iodide solution is 40%.

[0059] Preparation of potassium hydrogen iodate:

[0060] b1) After adding potassium chlorate to the water and mixing uniformly, then adding concentrated hydrochloric acid, and heating the temperature of the solution to 80°C after mixing uniformly to obtain a mixed solution of potassium chlorate and concentrated hydrochloric acid;

[0061] b2) Add dropwise the iodine-potassium iodide solution obtained in step a) to the mixed solution of potassium chlorate and concentrated hydrochloric acid obtained in step a). After the dropwise addition is completed, heat the temperature to 100°C and reflux for 1 hour. After cooling to room temperature, filter Obtain potassium hydro...

Embodiment 2

[0069] Preparation of iodine-potassium iodide solution:

[0070] Dissolve crude iodine in potassium iodide solution to prepare iodine-potassium iodide solution;

[0071] The molar ratio of crude iodine to potassium iodide solution is 1.5:1; the mass concentration of potassium iodide in the potassium iodide solution is 60%.

[0072] Preparation of potassium hydrogen iodate:

[0073] b1) After adding potassium chlorate to the water and mixing uniformly, add concentrated hydrochloric acid, and after mixing uniformly, heat the temperature of the solution to 95°C to obtain a mixed solution of potassium chlorate and concentrated hydrochloric acid;

[0074] b2) Add dropwise the iodine-potassium iodide solution obtained in step a) to the mixed solution of potassium chlorate and concentrated hydrochloric acid obtained in step a). After the dropwise addition is completed, heat the temperature to 100°C and reflux for 1 hour. After cooling to room temperature, filter Obtain potassium hydrogen ioda...

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Abstract

The invention discloses a method of preparing high-purity potassium iodate. An iodine-potassium iodate solution is prepared from crude iodine, thus solving the problem that iodine content cannot be accurately metered when crude iodine is directly fed; by means of the feeding mode of the iodine through dissolution, the problems that during addition of solid iodine, a manhole in a device needs to open for feeding the raw materials, which may cause environment pollution and health damage due to chlorine leakage and iodine volatilization, thereby improving the technical safety. The preparation method is simple and safe, is easy to carry out and low in cost and can reach more than 89% in yield and more than 99.5% in purity. The reaction process is free of generation of high-toxic gas, chlorine,and is free of generation of waste solid, waste gas and waste water. The process is safe and environment-friendly, is low in requirement on equipment, is low in cost, and is easy to achieve in industrial production.

Description

Technical field [0001] The invention relates to the field of potassium iodate, in particular to a method for preparing high-purity potassium iodate. Background technique [0002] Potassium iodate is a colorless or white powder. It is mainly used as an iodine supplement. It is used by the medical profession to make medicines for preventing and treating local goiter. In chemical analysis, it is used as a precipitant to test the content of zinc, arsenic and iodine. It can also be used as a redox titrant and analytical reagent for benchmark amyl esters. [0003] At present, there are many methods for preparing potassium iodate. For example, as reported in patent document CN200410047889.5, the potassium iodide solution is heated to 60-100°C to vent chlorine, and potassium hydroxide solution is added dropwise to control the pH between 7-10 When the iodide ions are consumed in the reaction, add concentrated hydrochloric acid, stir and cool, filter and wash, adjust the PH to neutral with ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B11/22
CPCC01B11/22
Inventor 李成林孙万堂周丽娜刘树法姚丽娜
Owner 山东博苑医药化学股份有限公司
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