Method for producing stable chlorine dioxide with high purity by using gas stripping technique

A chlorine dioxide, production method technology, applied in the direction of chlorine oxide, chemical instruments and methods, separation methods, etc., can solve problems such as excessive methanol content, unstable product quality, and field limitations

Inactive Publication Date: 2003-05-07
覃庆林
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The biggest disadvantage of this production method is that no matter what chlorine dioxide production method is used to generate chlorine dioxide gas, the mother liquor in the generator is easily entrained by chlorine dioxide gas and water vapor into the stable chlorine dioxide solution, and the product quality unstable, even with H 2 o 2 Using the R11 method as a reducing agent to generate chlorine dioxide gas, sodium chlorate and other substances in the mother liquor will also be entrained into the product, making it difficult to obtain high-purity stable CLO 2 , especially in the R8 chlorine dioxide production process using methanol as a reducing agent, methanol with a low boiling point is more likely to be brought into the stable chlorine dioxide product by the mixture of chlorine dioxide and water vapor generated from the generator to affect its quality In severe cases, the methanol content exceeds the standard, which limits its application range and field

Method used

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  • Method for producing stable chlorine dioxide with high purity by using gas stripping technique
  • Method for producing stable chlorine dioxide with high purity by using gas stripping technique

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Embodiment

[0012] Add 50M to a dissolution tank with a stirrer 3 Clear water, start the agitator, and 1250Kg of Na 2 CO 3 and 1190Kg of NaOH are poured into the dissolving tank, and after all of them are dissolved, slowly add 1250Kg of H 2 o 2 (100%), continue to stir for 30 minutes after adding, and the absorption solution prepared in this way can be used after standing for 24 hours.

[0013] Taking the preparation of chlorine dioxide by the R8 method as an example, 164 kg of sodium chlorate, 100 kg of sulfuric acid and 15 kg of methanol react in the generator to produce 100 kg of chlorine dioxide gas, and the concentration obtained with 7°C frozen water is Liter 10 grams of chlorine dioxide aqueous solution 10t. The aqueous solution is transferred to a desorption tank for desorption and air stripping, and then the prepared absorption liquid is used to react with the chlorine dioxide gas stripped out to obtain 50t of stable chlorine dioxide with a content of about 2%.

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Abstract

A process for preparing high-purity stable ClO2 by desorption and stripping includes such steps as absorbing ClO2 gas by freezing water to obtain its aqueous solution, desorbing and stripping ClO2 from said aqueous solution, and reacting with sodium peroxide (or carbonate) solution. Its advantages are high quality and purity and no influence from impurities.

Description

Technical field: [0001] The invention relates to a method for purifying and separating oxides, in particular to a method for producing high-purity stable chlorine dioxide by desorption and gas stripping. Background technique: [0002] Stable chlorine dioxide is a kind of disinfectant with a wide range of uses. The production technology at home and abroad is relatively mature. The usual production method is to use sodium peroxide or sodium percarbonate solution to directly absorb the dioxide produced by the chlorine dioxide generator. produced by chlorine gas. The biggest disadvantage of this production method is that no matter what chlorine dioxide production method is used to generate chlorine dioxide gas, the mother liquor in the generator is easily entrained by chlorine dioxide gas and water vapor into the stable chlorine dioxide solution, and the product quality unstable, even with H 2 o 2 Using the R11 method as a reducing agent to generate chlorine dioxide gas, sodi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14C01B11/02
Inventor 覃庆林
Owner 覃庆林
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