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Method for preventing invalid reaction in process of preparing chlorine dioxide with sodium chlorate reduction method

A technology of chlorine dioxide and reduction method, which is applied in the direction of chlorine oxidation, etc. It can solve problems such as invalid reaction, improper addition ratio, and inability to produce ClO, so as to improve reaction efficiency and prevent invalid reaction

Inactive Publication Date: 2012-06-20
CHENGDU JINXING LVYUAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, when using the sodium chlorate reduction method to prepare chlorine dioxide, if the addition ratio of several material components is inappropriate, it may lead to failure to produce ClO 2 product
If the acidity is too high, it will cause invalid reactions

Method used

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Embodiment Construction

[0009] The method to prevent the invalid reaction when the sodium chlorate reduction method is used to prepare chlorine dioxide is to adjust the acidity before the reaction. When it reaches at least 3.5mol / L, start to add methanol, and at the same time, maintain the flow of sulfuric acid to maintain the acidity of the reaction solution Not less than 3.5mol / L until the reaction stops, and the acidity should be controlled before solid formation Not more than 7mol / L, in order to avoid invalid reaction, the acidity can only be increased when solids appear Reach the normal 8.0 ~ 8.2mol / L.

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Abstract

The invention discloses a method for preventing an invalid reaction in a process of preparing chlorine dioxide with a sodium chlorate reduction method. The method comprises the following steps of: before the reaction, adding methanol until adjusting the acidity to at least be up to 3.5 mol / L and simultaneously maintaining the acidity of a reaction solution to be not lower than 3.5 mo / L until the reaction is finished; and meanwhile, controlling the acidity to be not more than 7 mol / L before a solid is formed, so as to avoid the invalid reaction. When the solid appears, the acidity can be improved to a normal value of 8.0-8.2 mol / L. According to the invention, by controlling the acidity of the reaction through using sulfuric acid, the invalid reaction can be better prevented and the reaction efficiency can be improved.

Description

technical field [0001] The invention relates to a method for preventing invalid chemical reaction, in particular to a method for preventing invalid reaction of chlorine dioxide system prepared by sodium chlorate reduction method. Background technique [0002] Sodium chlorate reduction method to prepare chlorine dioxide mainly uses impurity-free sodium chlorate, methanol, and sulfuric acid solution as raw materials. Under acidic conditions, methanol is used as a reducing agent to generate chlorine dioxide, which is obtained by absorbing 7°C frozen water. Chlorine dioxide stabilized solution, adjust the flow of chilled water to obtain the desired concentration (8-10g / L) of ClO 2 solution. The system tail gas is sent to the scrubber to wash and recover the ClO in the tail gas 2 Then discharged into the atmosphere. The main reaction formula of this method: 6NaClO 3 +4H 2 SO 4 +CH 3 OH→6ClO 2 +5H 2 O+2Na 3 H(SO 4 ) 2 +CO 2 ↑. [0003] The method is characterized by ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/02
Inventor 穆超银
Owner CHENGDU JINXING LVYUAN ENVIRONMENTAL PROTECTION TECH