Preparation method of potassium iodide

A technology of potassium iodide and potassium iodate, applied in the direction of alkali metal iodide, etc., which can solve the problems of difficult preparation, limited use and production

Inactive Publication Date: 2011-06-22
庄朝晖
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Problems solved by technology

[0002] Potassium iodide is a raw material for the preparation of iodides and dyes. It is used as a photosensitive emulsifier, a food additive, a cosolvent for iodine and some insoluble metal iodides, and can also be used as an analytical reagent, chromatographic analysis and point pain analysis. Its use Widely used, but potassium iodide is difficult to prepare due to its photosensitivity and moisture instability, which limits its use and production.

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  • Preparation method of potassium iodide

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[0010] The following are the raw materials and operating steps consumed for the preparation of one ton of potassium iodide:

[0011] (1) Add 0.765 tons of iodine tablets into a reaction vessel with a stirrer, then add distilled water to stir; under stirring, slowly add 0.337 tons of potassium hydroxide solution with a relative density of 1.3 to make it react completely, when the reaction is purple Brown, when the pH value is 5, potassium iodate crystals appear in the container.

[0012] (2) after slowly adding 0.277 tons of formic acid solution in the solution to reduce potassium iodate, add potassium hydroxide to adjust the pH value to be 10, feed steam, keep warm for 2 hours, leave standstill and filter, remove insoluble matter, obtain clear solution, Concentrate by evaporation until most of the crystals are separated out, then crystallize by cooling, centrifuge and dry to obtain the finished product.

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Abstract

The invention relates to a preparation method of potassium iodide. The preparation method is implemented based on the following technical scheme: (1) adding 765 parts of iodine tablets in a reaction container with a stirrer, then adding distilled water, and stirring; slowly adding 337 parts of potassium hydroxide solution with the relative density of 1.3 under the state of stirring until the reaction is complete, wherein when the solution in the reaction is puce and the pH value of the solution is 5-6, potassium iodate crystals occur in the container; and (2) slowly adding 277 parts of formic acid solution in the solution to reduce the potassium iodate, then adding potassium hydroxide for regulating the pH value to 9-10, introducing steam, carrying out heat preservation for 1-2 hours, standing, filtering to remove undissolved substances so as to obtain a silvery solution, carrying out evaporation concentration until most crystals are separated out, carrying out cooling crystallization and centrifugal separation, and drying, so as to obtain a finished product. According to the preparation method of the potassium iodide, the potassium iodide can be safely, conveniently and reliably produced, and the large-scale production is ensured to be possible, thus the preparation method can be widely applied.

Description

technical field [0001] The present invention relates to a kind of preparation method of chemical substance, especially a kind of preparation method of potassium iodide. Background technique [0002] Potassium iodide is a raw material for the preparation of iodides and dyes. It is used as a photosensitive emulsifier, a food additive, a cosolvent for iodine and some insoluble metal iodides, and can also be used as an analytical reagent, chromatographic analysis and point pain analysis. Its use However, due to the characteristics of photosensitivity and moisture instability, potassium iodide is difficult to prepare, which limits its use and production. Contents of the invention [0003] The purpose of this invention is to provide a kind of preparation method of simple and convenient potassium iodide, to meet the needs of its large-scale production. [0004] The present invention is achieved through the following technical solutions: [0005] (1) Add 765 parts of iodine tabl...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D3/12
Inventor 庄朝晖
Owner 庄朝晖
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