A kind of purification method of potassium iodide and application thereof

A purification method and technology of potassium iodide, applied in the direction of alkali metal halide purification, alkali metal iodide and the like, can solve the problems of low yield and unsatisfactory sodium removal effect, and achieve high yield, low energy consumption and good effect. Effect

Inactive Publication Date: 2011-12-14
GUANGDONG GUANGSHI REAGENTS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Potassium iodide and sodium iodide have a large solubility in water, so the method for water recrystallization to purify potassium io

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Weigh 400 grams of industrial grade potassium iodide into a 1000mL beaker, add 260 grams of anhydrous methanol to soak the crystals, stir intermittently for 60 minutes, then centrifuge to dry the methanol, add anhydrous methanol to soak the crystals, and then centrifuge to dry, repeat this three times. Add the centrifugally dried potassium iodide to 200 grams of anhydrous methanol dissolved with 0.4 grams of potassium hydroxide and soak the crystals for 40 minutes, stirring intermittently during this period. After centrifugal drying, the crystals are dried at 105° C. to obtain 360 g of potassium iodide. The yield is 90%, the product has been tested and meets the national analytical purity standard; the potassium iodide content is 99.3%, and the sodium ion content is 0.06%.

Embodiment 2

[0031] Weigh 400 grams of industrial grade potassium iodide into a 1000mL beaker, add 240 grams of absolute ethanol to soak the crystals, stir intermittently for 30 minutes, then centrifuge to dry the ethanol, add absolute ethanol to soak the crystals, and then centrifuge to dry, repeat this 5 times . The potassium iodide that centrifugal drying is added to 200 grams of dehydrated alcohol that is dissolved with 0.3 gram of potassium hydroxide is immersed in crystal for 30 minutes, during intermittent stirring, after centrifugal drying, crystal is dried at 102 ℃, obtains potassium iodide 384g, and the yield is 96%, the product has been tested and meets the national analytical purity standard; the potassium iodide content is 99.4%, and the sodium ion content is 0.05%.

Embodiment 3

[0033] Weigh 400 grams of industrial grade potassium iodide into a 1000mL beaker, add 280 grams of isopropanol to soak the crystals, stir intermittently for 120 minutes, then centrifuge to dry the isopropanol, add isopropanol to soak the crystals, and then centrifuge to dry, repeat three times. Add the centrifugally dried potassium iodide to 200 grams of isopropanol in which 0.3 grams of potassium hydroxide is dissolved and soak the crystals for 60 minutes, stirring intermittently during this period. After centrifugal drying, the crystals are dried at 100° C. to obtain 388 g of potassium iodide. The yield is 97%, the product has been tested and meets the national analytical purity standard; the potassium iodide content is 99.2%, and the sodium ion content is 0.06%.

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PUM

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Abstract

The invention discloses a method for purifying potassium iodide and its application. The method comprises the following steps: (1) taking technical grade potassium iodide, adding alcohol to soak for 0.5-2 hours; then centrifuging to take the precipitate; (2) repeating the precipitate The operations of step (1) are performed 3 to 5 times; (3) the precipitate is added to an alcohol containing potassium hydroxide and soaked for 0.5 to 1 hour; then centrifuged to take the precipitate; and the precipitate is dried to obtain purified potassium iodide. The potassium iodide purification method provided by the invention has the advantages of low energy consumption, low cost and less environmental pollution; simple operation, high yield, high efficiency, and good separation effect on sodium ions; overcoming the low yield of the existing potassium iodide purification method, and the removal of The effect of sodium is not ideal.

Description

technical field [0001] The invention belongs to the field of chemical industry, and in particular relates to a method for purifying potassium iodide and an application thereof. Background technique [0002] Potassium iodide is a co-solvent for iodine and some insoluble metal iodides. It is also used as a photographic photosensitive emulsifier. It is used in medicine as an expectorant, diuretic, goiter preventive agent, and preoperative medication for hyperthyroidism. It is used in the manufacture of rheumatism analgesic ointment with the effect of relieving pain and promoting blood circulation, and has a wider market prospect than potassium iodate. Since potassium and sodium are in the same main group and have very similar properties, it is difficult to separate the impurity sodium ions in potassium iodide. The traditional purification method of potassium iodide is repeated recrystallization with water to achieve the purpose of purification. Potassium iodide and sodium iod...

Claims

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Application Information

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IPC IPC(8): C01D3/18C01D3/12
Inventor 王保金李帅刘红梅谷芳芳
Owner GUANGDONG GUANGSHI REAGENTS TECH
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