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Production method of high-yield potassium iodate

A production method and technology of potassium iodate, applied in the directions of iodine oxygen compounds and the like, can solve the problems of high absorption pressure of tail gas, ineffective utilization, large energy consumption, etc., to reduce environmental protection pressure, improve reaction efficiency and reaction speed, avoid sublimation effect

Inactive Publication Date: 2018-04-20
XILONG SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main shortcoming of production process is that the potassium iodate solution of synthesis contains a large amount of potassium chloride and potassium chlorate, and the potassium chloride that concentrates and separates at last, contains more potassium iodate in the potassium chlorate tailings, causes the yield of potassium iodate Low; the amount of by-product chlorine in production is large, and it is released in a short period of time, which cannot be effectively used, resulting in high pressure for tail gas absorption
In addition, the recovery of tailings is large, the recovery process is complicated, the energy consumption is large, and the recovery cost is high, which easily leads to secondary pollution

Method used

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  • Production method of high-yield potassium iodate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Add 42Kg of potassium iodide to 50L of water, stir to dissolve, add 250ml of sulfuric acid, dropwise add 100L of 30wt% hydrogen peroxide, control the reaction temperature at 55°C, and add dropwise until the resulting yellow solution fades to colorless;

[0015] (2) Stir the reaction for 1 hour, adjust the pH of the reaction solution to 7.5 with 40% potassium hydroxide solution, raise the temperature to 90-100°C, continue to keep warm and stir the reaction until the total volume is about 60L, stop heating, and cool the reaction solution Centrifuge and dry the crystals to room temperature to obtain crude potassium iodate. The mother liquor is concentrated at 90-100°C to a small amount of crystallization, then cooled and crystallized, and the solid is incorporated into the crude potassium iodate.

[0016] (3) Add 42Kg of the obtained potassium iodate crude product to the temperature and dissolve it, adjust the specific gravity of the solution to d=1.17, keep the tempera...

Embodiment 2

[0021] (1) Add 84Kg of potassium iodide to 100L of water, stir to dissolve, add 600ml of sulfuric acid, add 234L of 30% hydrogen peroxide dropwise, control the reaction temperature at 60°C, and add dropwise until the resulting yellow solution fades to colorless;

[0022] (2) Stir the reaction for 1 hour, adjust the pH of the reaction solution to 7.5 with 40% potassium hydroxide solution, raise the temperature to 90-100°C, continue to keep warm and stir the reaction until the total volume is about 120L, stop heating, and cool the reaction solution Centrifuge and dry the crystals to room temperature to obtain crude potassium iodate. The mother liquor is concentrated at 90-100°C to a small amount of crystallization, then cooled and crystallized, and the solid is incorporated into the crude potassium iodate.

[0023] (3) Add 87Kg of the obtained potassium iodate crude product to the temperature and dissolve it, adjust the specific gravity of the solution to d=1.18, heat it at 90°C ...

Embodiment 3

[0028] (1) Add 840g of potassium iodide to 1000ml of water, stir to dissolve, add 6ml of sulfuric acid, dropwise add 1650ml of 30% hydrogen peroxide, control the reaction temperature at 55°C, and add dropwise until the resulting yellow solution fades to colorless;

[0029] (2) Stir the reaction for 1 hour, adjust the pH of the reaction solution to 7.5 with 40% potassium hydroxide solution, raise the temperature to 90~100°C, continue to keep warm and stir the reaction until the total volume is about 1200ml, stop heating, and cool the reaction solution Centrifuge and dry the crystals to room temperature to obtain crude potassium iodate. The mother liquor is concentrated at 90-100°C to a small amount of crystallization, then cooled and crystallized, and the solid is incorporated into the crude potassium iodate.

[0030] (3) Add 998g of the obtained potassium iodate crude product to the temperature and dissolve it, adjust the specific gravity of the solution to d=1.19, keep it warm...

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Abstract

The invention discloses a production method of high-yield potassium iodate. The production method comprises the following steps: adding potassium iodide to water, stirring the potassium iodide to be dissolved, then adding nitric acid, hydrochloric acid or sulfuric acid, dropwise adding hydrogen peroxide for reacting, then adjusting the pH to be 7-8 with a potassium hydroxide solution, performing concentrated crystallization, and then performing re-crystallization to obtain a finished product. The production method is small in investment and good in process controllability, and the product is high in purity and stable in yield.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and relates to a method for producing potassium iodate based on a hydrogen peroxide oxidation method. Background technique [0002] Potassium iodate is widely used in salt iodization, and also used as analytical reagent, medicine and feed additive. At present, the methods for preparing potassium iodate mainly include potassium chlorate oxidation, hydrogen peroxide oxidation, chlorine oxidation, ozone oxidation, disproportionation and electrolysis. [0003] The method that is used for industrialized production potassium iodate at present is mainly potassium chlorate oxidation process at home and abroad, and potassium chlorate oxidation method is to make potassium hydrogen iodate with potassium chlorate oxidation iodine, then obtains potassium iodate with potassium hydroxide neutralization. The main shortcoming of production process is that the potassium iodate solution of synt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/22
CPCC01B11/22C01P2006/80
Inventor 王宇李湛江李燕平
Owner XILONG SCI CO LTD
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