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Method of preparing high-purity potassium iodate

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

Active Publication Date: 2018-12-14
山东博苑医药化学股份有限公司
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  • Description
  • Claims
  • 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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  • Method of preparing high-purity potassium iodate

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preparation example Construction

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

[0034] Crude iodine is dissolved in potassium iodide solution to obtain iodine-potassium iodide solution;

[0035] b) preparation of potassium hydrogen iodate:

[0036] The iodine-potassium iodide solution prepared in step a) is dropped 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] Potassium hydroxide is used to adjust the pH value of the potassium hydrogen iodate solution prepared in step b) to 7-8, decolorize, crystallize, filter, and dry to obtain potassium iodate.

[0039] The above technical scheme uses crude iodine to prepare iodine-potassium iodide solution, which solves the problem that the iodine content cannot be accurately measured by direct feeding of crude iodine; the feeding method of dissolving iodine is used to improve the feeding of solid iodine. Chlorine leakage...

Embodiment 1

[0056] Preparation of iodine-potassium iodide solution:

[0057] Crude iodine is dissolved in potassium iodide solution to obtain 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 potassium iodide solution is 40%.

[0059] Preparation of potassium hydrogen iodate:

[0060] b1) Potassium chlorate is added to water and mixed evenly, then add concentrated hydrochloric acid, after mixing evenly, the temperature of the solution is heated to 80° C. to obtain a mixed solution of potassium chlorate and concentrated hydrochloric acid;

[0061] b2) Add the iodine-potassium iodide solution obtained in step a) dropwise to the mixed solution of potassium chlorate and concentrated hydrochloric acid obtained in step a), after the dropwise addition, heat the temperature to 100° C. for reflux reaction for 1 h, cool to room temperature, and filter Potassium hydrogen iodate is obtained; ...

Embodiment 2

[0069] Preparation of iodine-potassium iodide solution:

[0070] Crude iodine is dissolved in potassium iodide solution to obtain 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 potassium iodide solution is 60%.

[0072] Preparation of potassium hydrogen iodate:

[0073] b1) Potassium chlorate is added to water and mixed evenly, then concentrated hydrochloric acid is added, and after mixing evenly, the temperature of the solution is heated to 95° C. to obtain a mixed solution of potassium chlorate and concentrated hydrochloric acid;

[0074] b2) Add the iodine-potassium iodide solution obtained in step a) dropwise to the mixed solution of potassium chlorate and concentrated hydrochloric acid obtained in step a), after the dropwise addition, heat the temperature to 100° C. for reflux reaction for 1 h, cool to room temperature, and filter Potassium hydrogen iodate is...

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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 potassium periodate. Background technique [0002] Potassium iodate is a colorless or white powder, mainly used as an iodine supplement, used in the medical field to make medicines for the prevention and treatment of local goiter, and used as a precipitant in chemical analysis to test the content of zinc, arsenic, and iodine , It can also be used as a redox titrant and an analytical reagent for benchmark amyl esters. [0003] At present, there are many preparation methods of medium potassium iodate, as reported in the patent document CN200410047889.5, the potassium iodide solution is heated to 60-100 °C to pass chlorine gas, and potassium hydroxide solution is added dropwise at the same time to control the pH between 7-10 , when the iodide ion is consumed in the reaction, add concentrated hydrochloric acid, stir and cool, filter and wash, adjust the pH to n...

Claims

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Application Information

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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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