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Method for producing sodium periodate

A sodium periodate and production method technology, applied in the direction of iodine oxygen compounds, etc., can solve problems such as low safety, large consumption of raw materials, difficult operation control, etc., to achieve environmental protection, high production safety, and small consumption Effect

Active Publication Date: 2012-07-18
自贡市金典化工有限公司
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  • Description
  • Claims
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Problems solved by technology

[0005] The shortcoming of this method is: the consumption of raw material is big, and economic cost is high, and from reaction equation, the sodium periodate of producing 1mol needs to consume the sodium hydroxide of 10mol, the chlorine of 3.5mol, also can produce the chlorine of 7mol simultaneously sodium chloride, resulting in the discharge of a large amount of stock solution and high-concentration sodium chloride solution, causing great environmental pollution and increasing the difficulty of safe and environmentally friendly production. At the same time, a large amount of chlorine gas is used in the preparation process. It is a yellow-green toxic gas with a pungent smell. It must be used and stored very carefully. It has strict requirements on the conditions of use and storage equipment. Therefore, the use of chlorine gas oxidation to prepare sodium periodate has strict requirements on safe production. The method is cumbersome and complicated, the operation is difficult to control, and the safety degree is low

Method used

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  • Method for producing sodium periodate
  • Method for producing sodium periodate
  • Method for producing sodium periodate

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Embodiment 1

[0017] Embodiment 1: a kind of production method of sodium periodate comprises successively the preparation step of dihydrotrisodium periodate, the preparation step of sodium periodate, the crystallization separation step, centrifugal dehydration step and drying step, wherein,

[0018] (1) The preparation steps of trihydrogen trisodium periodate are:

[0019] a. The preparation step of sodium hydrogen iodate: put into the water of 700~800L in the reactor, be 11:6:3 to weigh sodium chlorate and iodine according to the mol ratio of sodium chlorate, iodine and water, put it into Put it into the reaction kettle, add an appropriate amount of concentrated nitric acid to adjust the pH value of the solution to ≤1, heat the reaction kettle for 0.5 hours, then open the steam valve of the reaction kettle and the chlorine-removing valve to chase chlorine for 150 minutes, expel the chlorine gas and absorb it with lye until the inside of the reaction kettle turns red. disappear, the solutio...

Embodiment 2

[0030] Embodiment 2: a kind of production method of sodium periodate comprises the preparation step of dihydrotrisodium periodate, the preparation step of sodium periodate, the crystallization separation step, centrifugal dehydration step and drying step successively, wherein,

[0031] (1) The preparation steps of trihydrogen trisodium periodate are:

[0032]a. The preparation step of sodium hydrogen iodate: put into the water of 700~800L in the reactor, be 11:6:3 to weigh sodium chlorate and iodine according to the mol ratio of sodium chlorate, iodine and water, put it into Put it into the reaction kettle, add an appropriate amount of concentrated nitric acid to adjust the pH value of the solution to ≤1, heat the reaction kettle for 1 hour, then open the steam valve of the reaction kettle and the chlorine-removing valve to chase chlorine for 180 minutes, expel the chlorine gas and absorb it with lye until the inside of the reaction kettle is red disappear, the solution is cle...

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Abstract

The invention discloses a method for producing sodium periodate. The method comprises the steps of preparation of trisodium dihydrogen periodate, preparation of sodium periodate, crystallization and separation, centrifugal dehydration and drying, wherein the preparation step of the trisodium dihydrogen periodate sequentially comprises the steps of preparation of sodium hydrogen iodate, preparation of sodium iodate and oxidation with sodium persulfate. The trisodium dihydrogen periodate is obtained by reacting sodium chlorate and iodine in an aqueous solution to produce the sodium hydrogen iodate, neutralizing the sodium hydrogen iodate by using sodium hydroxide to obtain the sodium iodate and oxidizing the sodium iodate in the sodium hydroxide solution by using the sodium persulfate, so that the method for preparing the trisodium dihydrogen periodate by using chlorine, iodine and sodium hydroxide in the prior art is abandoned, and the production method is stable in reaction, easy to control and high in production safety degree. Compared with a chlorine oxidation method, the method has the advantages of low consumption of raw materials, small amount of discharged waste liquor and environment friendliness.

Description

technical field [0001] The present invention relates to a kind of production method of sodium periodate, be specifically related to iodine, sodium chlorate (NaClO 3 ), sodium hydroxide, sodium persulfate (Na 2 S 2 o 8 ), nitric acid and water are the method for raw material production sodium periodate. Background technique [0002] Sodium periodate, or sodium metaperiodate, has the molecular formula NaIO 4 , which is a colorless or white tetragonal crystalline powder with a relative density of 3.865, melts and decomposes at 300°C, and is soluble in water (solubility in water: 0°C 4.17g / 100gH 2 O, 25°C 12.62g / 100gH 2 O), sulfuric acid, nitric acid, acetic acid, insoluble in sodium hydroxide and ethanol, its aqueous solution generates H due to hydrolysis + and H 3 IO 6 2+ And acidic. Sodium periodate is the main raw material in the pharmaceutical industry. It is used in the food industry and pharmaceutical industry. It can be used as an oxidizing agent, general analy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/22
Inventor 刘琪宋玉明
Owner 自贡市金典化工有限公司
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