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A method for preparing clo2 using combined BSC reducing reagent

A chlorine dioxide and production method technology, applied in the direction of chlorine oxidation, etc., can solve problems such as increased foam generation, pipeline blockage, and relatively expensive hydrogen peroxide, and achieve the effects of reduced ingredients and reduced production costs

Inactive Publication Date: 2009-09-30
GUANGXI UNIV +1
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The sodium chlorate method mainly uses sulfur dioxide, methanol, sodium chloride or hydrochloric acid as the reducing agent. These methods all have the disadvantage that the conversion rate is not very high. The R8 method is currently the leading production method
The production of chlorine dioxide by hydrogen peroxide as a reducing agent is a newly developed method, the process is efficient and the reaction speed is fast, but the price of hydrogen peroxide is relatively expensive, and hydrogen peroxide is a relatively stable compound, which is easy to decompose and produce Oxygen will increase the amount of foam generated in the chlorine dioxide generator, and the foam will easily entrain the liquid in the generator into the exhaust pipe, resulting in the loss of reactants, especially sodium chlorate, due to foam entrainment
The liquid carried by the foam may freeze in the gas condenser, causing blockage of the pipeline so that the production cannot run continuously

Method used

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  • A method for preparing clo2 using combined BSC reducing reagent

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Comparison scheme
Effect test

Embodiment 1

[0017] 102 kg of concentrated sulfuric acid with a weight concentration of 98% and 543 kg of sodium chlorate solution (containing 163 kg of solid sodium chloride) with a weight concentration of 30% are filtered and injected into the generator to form a reaction mother liquor, which is circulated in the generator under the action of a circulation pump Circulate in the pipeline and keep the acidity of the reaction mother liquor at 8.0-8.2N and the content of sodium chlorate at 235-266g / l. The steam transfers heat through the reboiler to heat the reaction mother liquor and keep the temperature at 71-73°C. Dilute 13kg of methanol to a volume concentration of 20%, mix it with 0.7kg of hydrogen peroxide through a static mixer to form a combined BSC reducing agent, inject it into the generator through a nozzle, and make it react to generate chlorine dioxide. The generator maintains a vacuum condition at a pressure of 120 mm Hg, and the vacuum is generated by two Venturi devices pumpe...

Embodiment 2

[0019] 1020kg of concentrated sulfuric acid with a weight concentration of 98% and 543kg of sodium chlorate solution (containing 163kg of solid sodium chloride) with a weight concentration of 30% are filtered and injected into the generator to form a reaction mother liquor, which is circulated in the generator under the action of a circulating pump Circulate in the pipeline and keep the acidity of the reaction mother liquor at 8.0-8.2N and the content of sodium chlorate at 235-266g / l. The steam transfers heat through the reboiler to heat the reaction mother liquor and keep the temperature at 71-73°C. Dilute methanol with a weight of 14kg to a volume concentration of 20%, and mix it with hydrogen peroxide with a weight of 0.9kg to form a combined BSC reducing agent through a static mixer, and inject it into the generator through a nozzle to make the reaction generate chlorine dioxide. The generator maintains a vacuum condition at a pressure of 120 mm Hg, and the vacuum is gener...

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Abstract

The invention relates to a method for preparing clo2 using combined BSC reducing reagent, which indicates first immitting concentrated sulfuric acid and atlacide solution into the generator as reaction mother liquor, keep the mother liquor at a given acidity, temperature and atlacide content, and then the clo2 and accessory product mirabilite is prepared after adding BSC reducing reagent mixed-up of methanol and auricome. The clo2 is absorbed by low-temperature refrigerated water after cooled-down, chlorine dioxide water solution of some concentration is done, the accessory product is recovered at the same time. The adding mete of the aforementioned BSc reducing reagent is 13-15% of the vitriol oil, and in the BSC reducing reagent, methanol takes 93%-95% while auricome takes 5%-7%. The percent conversion is improved 3%-5%, the cost is low and reduce the constituent of chlorine element in chlorine oxide.

Description

technical field [0001] The invention relates to a production method of chlorine dioxide, in particular to a method for producing chlorine dioxide by a sodium chlorate method. Background technique [0002] Chlorine dioxide is a strong oxidizing agent. Stable chlorine dioxide has been recognized by the World Health Organization as a good fungicide and disinfectant, and it is also a good paper bleaching agent. Industrial production began in the 1930s, and there are currently about 1,000 chlorine dioxide production plants in North America and Europe. At present, my country has realized the localization of small-scale chlorine dioxide production equipment for disinfection. However, for the large-scale chlorine dioxide preparation system for on-site preparation and on-site digestion, the country is still in the research and development stage. The large-scale chlorine dioxide used by existing paper companies The production system is imported complete set of equipment technology. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/02
Inventor 王双飞农光再宋海农杨崎峰陈国宁陈楠陈永利朱红祥骆莲新
Owner GUANGXI UNIV
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