Iodate preparation method

A technology of iodate and iodic acid, which is applied in the direction of iodine oxygen compounds, etc., can solve the problems of difficulty in improving product quality, complicated separation of by-products, and increased production costs.

Inactive Publication Date: 2016-01-27
谈丽娜
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] Adopt the same process to produce the larger alkali metal iodate of solubility, then the separation work of its by-p

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] In a 500-liter reactor, add 100 kilograms of distilled water, 50 kilograms of hydrogen peroxide (according to 100%), 2 liters of nitric acid (98%), and 40 kilograms of refined iodine, stir constantly, and control the temperature at 70°C Under condition, reacted 4 hours, can make content and be 300 kilograms of iodic acid solution of 18%, the yield of iodic acid is 98% (taking iodine amount as a benchmark). Then under the condition of temperature 50 ℃, constantly stir, and slowly add the potassium carbonate solution that concentration is 40%, make the pH value of reaction solution equal to 7, the adding total amount of potassium carbonate solution is 61 kilograms. The precipitated crystals are filtered through a filter, the mother liquor is returned to the reactor for evaporation and recrystallization, the crystals can be rinsed with distilled water, and finally the washed crystals are dried at 100°C until the water content is less than 0.5%, and the finished product pota...

Embodiment 2

[0046] In a 500-liter reactor, add 20 kg of deionized water, 40 kg of refined iodine, 60 kg of hydrogen peroxide (100%), and 20 kg of chloric acid (concentration is 10%), under constant stirring, control the temperature Reaction under the condition of 90 ℃ for 8 hours, available content is 235 kilograms of iodic acid solution of 23%, and iodic acid yield is 98% (in iodine). After the temperature of the iodic acid solution was down to 20°C, slowly add a concentration of 40% potassium carbonate solution until the pH value was equal to 7 o'clock, adding 64 kg of potassium carbonate solution. At this time, the precipitated crystals enter the filter for filtration, and the mother liquor is evaporated and crystallized to recover potassium iodate. After the filtered potassium iodate crystals are rinsed with deionized water, the crystals are taken out and dried at 75°C until the water content is less than 0.5%. 59.4 kilograms of finished product potassium iodate can be obtained, and i...

Embodiment 3

[0048] In the -500 liter reactor, add 40 kg of refined iodine, 52 kg of hydrogen peroxide (100%), 100 kg of distilled water, and 20 kg of iodic acid solution with a concentration of 10%. Stir constantly at 90°C and react 6 hours, can make content and be 281 kilograms of iodic acid solution of 20%, calculate with iodine, the yield of iodic acid is 98%. Lower the temperature of the iodic acid solution to 30°C, and slowly add potassium carbonate solution with a concentration of 40%, until the pH value of the solution is equal to 7. Add 56 kilograms of this potassium carbonate solution altogether, filter the reaction slurry that has precipitated crystallization, mother liquor is evaporated again to reclaim potassium iodate, the crystallization that is filtered is rinsed with distilled water, then takes out crystallization and dries at 95°C until the free moisture is lower than 0.5%, promptly gets 61 kilograms of finished product potassium iodate (content is not less than 99.0%). ...

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PUM

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Abstract

The invention relates too an iodate preparation method, which comprises: A, iodic acid preparation, wherein hydrogen peroxide is used as an oxidant, small amounts of nitric acid and halogen acid such as chloric acid, bromic acid and iodic acid are adopted as catalysts of an oxidation reaction, refined iodine is oxidized into the iodic acid, the addition amount of the used nitric acid is 1-10% of the added refined iodine, the addition amount of the used halogen acid is 0.5-50% of the added refined iodine, the reaction temperature is 50-100 DEG C, and the reaction time is 4-8 h; and B, iodate preparation, wherein the pure iodic acid solution obtained through the step A is neutralized directly with a carbonate solution of a hydroxide or alkali metal, the neutralization reaction temperature is controlled at 20-50 DEG C, and the neutralization PH value is 7.

Description

technical field [0001] The invention relates to a preparation method of iodate. Background technique [0002] Iodic acid is one of the oxyacids of iodine with the molecular formula HIO 3 , Industrially used as pharmaceutical synthesis intermediates, catalysts, chemical reagents. Salts of alkali metals (such as sodium, potassium) and alkaline earth metals (such as calcium, barium) are commonly used in iodates, among which potassium iodate can be used as a reference reagent in chemical analysis, and can also be used as an iodine supplement, such as Salt iodine. Calcium iodate is used as an additive in food and feed. These products are produced both at home and abroad. [0003] The preparation method of disclosed iodic acid and its salts both at home and abroad is introduced as follows: [0004] (1) the preparation method of iodic acid: [0005] (1), chlorine oxidation method [1]: [0006] (2), concentrated nitric acid oxidation method 〔1、2〕 : [0007] (3), hydrogen pe...

Claims

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Application Information

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IPC IPC(8): C01B11/22
Inventor 谈丽娜
Owner 谈丽娜
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