Preparation method of iodate

A technology of iodate and iodic acid, applied in directions such as bromine oxycompound, can solve the problems of difficulty in improving product quality, complicated by-product separation work, increase in production cost, etc., so as to reduce equipment investment, reduce energy consumption, and improve product quality. Effect

Inactive Publication Date: 2016-02-17
马井芳
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Problems solved by technology

[0003] 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
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Effect test

Embodiment 1

[0017] In the reactor of 500 liters, 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, constantly stir, and temperature is controlled at 70 ℃. Under condition, reacted 6 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 pro...

Embodiment 2

[0019] In a 500-liter reactor, add 20 kilograms of deionized water, 40 kilograms of refined iodine, 60 kilograms of hydrogen peroxide (100%), and 20 kilograms of chloric acid (concentration is 10%). Under constant stirring, the temperature is controlled at 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 terms of 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 kilograms of finished pro...

Embodiment 3

[0021] In the reactor of 500 liters, add 40 kilograms of refined iodine, 52 kilograms of hydrogen peroxide (in 100%), 100 kilograms of distilled water, concentration is 20 kilograms of iodic acid solution of 10%, constantly stir at 90 ℃, and react 6 Hour, 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 ...

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Abstract

A preparation method of iodate is characterized by comprising the following two steps: 1, iodic acid preparation: oxidizing refined iodine into iodic acid by using hydrogen peroxide as an oxidant, and using a small amount of nitric acid and hydracids such as chloric acid, bromic acid, and iodic acid as the catalyst for the oxidation reaction, wherein the amount of nitric acid is 1-10% of the fined iodine, the amount of hydracids is 0.5-50% of the refined iodine, the reaction temperature is 50 DEG C to 100 DEG C, and the reaction time is 4-8 h; and 2, iodate preparation: directly neutralizing the pure iodate solution obtained by step 1 by using hydrogen oxide or carbonate solution of alkali metal, wherein the reaction temperature of neutralization reaction is controlled in the range of 50-100 DEG C and the neutralization pH value is equal to 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. [0003] Adopt the same process to produce the larger alkali metal iodate of solubility, then the separation work of its by-product will be complicated and the quality of product is difficult to improve, correspondingly make production cost improve. [0004] In view of the current national requirement to iodize common salt, the domestic demand for pharmaceutica...

Claims

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Application Information

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IPC IPC(8): C01B11/20
Inventor 马井芳
Owner 马井芳
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