Method for producing chlorine dioxide with high purity by adopting combined reducing agent

A chlorine dioxide and reducing agent technology, which is applied in the direction of chlorine oxidation, can solve the problems of increased cost, low conversion rate, and large proportion of chlorine gas, and achieve the effects of reducing production costs, increasing conversion rate, and reducing the amount of chlorine gas

Active Publication Date: 2010-06-23
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The sodium chlorate method mainly uses sulfur dioxide, sodium chloride or hydrochloric acid as the reducing agent, and the raw materials are widely obtained and the price is low. However, these methods have disadvantages such as low conversion rate and large proportion of chlorine gas.
The production of chlorine dioxide by hydrogen peroxide as a reducing agent is a newly developed method. Its process is efficient and the reaction speed is fast, but hydrogen peroxide is expensive, and hydro

Method used

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  • Method for producing chlorine dioxide with high purity by adopting combined reducing agent
  • Method for producing chlorine dioxide with high purity by adopting combined reducing agent

Examples

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Embodiment 1

[0032] 108kg of concentrated sulfuric acid with a weight concentration of 98% and 547kg of sodium chlorate solution with a weight concentration of 30% are filtered and injected into the generator to form a reaction mother liquor, which circulates in the generator circulation pipeline under the action of a circulation pump and keeps the reaction mother liquor The acidity is 8.0-8.2N and the sodium chlorate content is 158-266g / l. The steam transfers heat through the reboiler to heat the reaction mother liquor and keep the temperature at 68-78°C. 52.5kg by weight of 20% methanol, 12.5kg by weight of 30% hydrogen peroxide and 2.5kg by weight of 30% hydrochloric acid were injected into the generator with a nozzle 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 pumped with medium pressure steam to create a vacuum. Under the condition of negative pressure, the temperature of the m...

Embodiment 2

[0034] 108kg of concentrated sulfuric acid with a weight concentration of 98% and 547kg of sodium chlorate solution with a weight concentration of 30% are filtered and injected into the generator to form a reaction mother liquor, which circulates in the generator circulation pipeline under the action of a circulation pump and keeps the reaction mother liquor The acidity is 8.0-8.2N and the sodium chlorate content is 158-266g / l. The steam transfers heat through the reboiler to heat the reaction mother liquor and keep the temperature at 68-78°C. 67.5kg by weight of 20% methanol, 3.5kg by weight of 30% hydrogen peroxide and 1.5kg by weight of 30% hydrochloric acid were injected into the generator with a nozzle 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 pumped with medium pressure steam to create a vacuum. Under the condition of negative pressure, the temperature of the mi...

Embodiment 3

[0036] 108kg of concentrated sulfuric acid with a weight concentration of 98% and 547kg of sodium chlorate solution with a weight concentration of 30% are filtered and injected into the generator to form a reaction mother liquor, which circulates in the generator circulation pipeline under the action of a circulation pump and keeps the reaction mother liquor The acidity is 8.0-8.2N and the sodium chlorate content is 158-266g / l. The steam transfers heat through the reboiler to heat the reaction mother liquor and keep the temperature at 68-78°C. 64.5kg concentration of 20% methanol by weight, 5kg concentration of 30% hydrogen peroxide and 2kg concentration of 30% hydrochloric acid were injected into the generator with 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 generated by two Venturi devices pumped with medium pressure steam to create a vacuum. Under the condition of negative...

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Abstract

The invention relates to a method for producing chlorine dioxide with high purity by adopting a combined reducing agent. The method comprises the following steps of: injecting concentrated sulfuric acid and a sodium chlorate solution into a generator to form a reacting mother solution; maintaining the reacting mother solution to a certain acidity, temperature and the content of sodium chlorate; then adding a combined reducing agent formed by mixing methanol, hydrogen peroxide, hydrochloric acid or sodium chlorate to react for generating chlorine dioxide gas and a byproduct namely acid mirabilite; cooling and then absorbing the chlorine dioxide gas by using low temperature frozen water to obtain a water solution of chlorine dioxide; and simultaneously recovering the byproduct. The conversion rate of the chlorine dioxide produced by the method is improved by 3-6 percent as comparison with that of the chlorine dioxide produced by a single reducing agent, the stability of chemical reaction is improved, the production cost is reduced, and the chlorine amount in the chlorine dioxide solution and tail gas exhausted from a chlorine dioxide absorbing tower is remarkably reduced.

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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IPC IPC(8): C01B11/02
Inventor 周茂贤徐萃声詹磊李许生农斌农光再兰云飞
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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