Method for preparing chlorine dioxide from composite chlorate

A chlorine dioxide and chlorate technology, applied in chlorine dioxide, chlorine oxide and other directions, can solve problems such as large safety hazards, and achieve the effects of stable quality, simple and convenient operation, and ensuring output and quality.

Inactive Publication Date: 2017-05-24
SICHUAN QILI LVYUAN WATER TREATMENT TECH CO LTD
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The present invention provides a method for preparing chlorine dioxide by compound chlorate in order to solve the problem of large potential safety ha

Method used

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  • Method for preparing chlorine dioxide from composite chlorate
  • Method for preparing chlorine dioxide from composite chlorate
  • Method for preparing chlorine dioxide from composite chlorate

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] The preparation method of the composite chlorate solution is as follows:

[0027] (a) Prepare chlorate solution: mix chlorate with water and dissolve it into a chlorate solution with a mass percentage of 28-35%. If the chlorate concentration is too low, the chemical reaction time will be prolonged and the output of chlorine dioxide will be reduced; if the chlorate concentration is too high, it will crystallize at room temperature and affect the use. The chlorate is one of sodium chlorate, potassium chlorate and barium chlorate or a mixture thereof, preferably sodium chlorate.

[0028] (b) Prepare dilute sulfuric acid solution: dilute concentrated sulfuric acid with water to form a dilute sulfuric acid solution with a mass percentage of 60-80%. If the concentration of sulfuric acid is too low, it will affect the chemical reaction speed and reduce the conversion rate of raw materials; if the concentration of sulfuric acid is too high, it will easily react with chlorate to pro...

Example Embodiment

[0035] Example 1: An implementation case of controlling the temperature of the reaction system at 60°C

[0036] The composite chlorate solution with the sodium chlorate content of 12.0% and the sulfuric acid content of 33.0% was added to the chlorine dioxide device with a metering pump at a flow rate of 20L / h. At the same time, the hydrogen peroxide with a content of 27.5% was pumped to 2.8 The flow rate of L / h is added to the reactor, the temperature of the material is controlled at 60℃, the reactor is maintained under negative pressure with a water jet and the chlorine dioxide is extracted and mixed with water to form a chlorine dioxide solution. The test data is shown in Table 1. :

[0037]

[0038]

[0039] The output of chlorine dioxide in this case is 2175g / h, the conversion rate of the main raw material sodium chlorate is 95.1%, and the purity of chlorine dioxide is 98.4%.

Example Embodiment

[0040] Example 2: Controlling the temperature of the reaction system at 65°C

[0041] The composite chlorate solution with sodium chlorate content of 14.0% and sulfuric acid content of 35.0% was added to the chlorine dioxide generator with a metering pump at a flow rate of 40L / h. At the same time, the hydrogen peroxide with a content of 27.5% was used with a metering pump. The flow rate of 5.6L / h is added to the reactor of the generator, the temperature of the material is controlled at 65°C, the reactor is maintained at a negative pressure with a water jet, and the chlorine dioxide is extracted and mixed with water to form a chlorine dioxide solution. The data is shown in Table 2:

[0042]

[0043] The chlorine dioxide output of this embodiment is 4666.3 g / h, the conversion rate of the main raw material sodium chlorate is 95.3%, and the chlorine dioxide purity is 98.5%.

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Abstract

The invention belongs to the technical field of chlorine dioxide, discloses a method for preparing the chlorine dioxide from composite chlorate and aims at solving the problem of great potential safety hazards of a three element method using the chlorine dioxide in the prior art. The method for preparing the chlorine dioxide from the composite chlorate comprises the following steps: feeding a composite chlorate solution and a reducing agent solution into a chlorine dioxide generator or a reaction kettle, and controlling the reaction temperature of materials under the condition of negative pressure and at the temperature of 50 to 75DEG C to obtain the chlorine dioxide, wherein the composite chlorate solution contains the chlorine of which the mass concentration is 8 to 18 percent and sulfuric acid of which the mass concentration is 28 to 45 percent. According to the method disclosed by the invention, the chlorine dioxide is prepared by adopting a two-element method without use of hazardous chemicals by a user; the method has the characteristics of safety, simplicity, convenience and high efficiency.

Description

technical field [0001] The invention belongs to the technical field of chlorine dioxide preparation, and in particular relates to a method for preparing chlorine dioxide from a compound chlorate. Background technique [0002] Chlorine dioxide (ClO 2 ) is an internationally recognized fourth-generation broad-spectrum strong disinfectant and high-efficiency bleach, which is widely used in countries all over the world. . [0003] At present, the methods for preparing chlorine dioxide mainly include the chlorite method and the chlorate method. Because the cost of preparing chlorine dioxide from chlorite is high, it is not suitable for places where chlorine dioxide is used in large quantities, so the chlorate method is widely used. The chlorate method mainly uses sodium chlorate and sulfuric acid as raw materials, hydrogen peroxide, methanol, sucrose, urea, etc. as reducing agents, and sodium chlorate is reduced to chlorine dioxide at a certain temperature and negative pressur...

Claims

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Application Information

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IPC IPC(8): C01B11/02
CPCC01B11/023C01P2006/80
Inventor 穆超银向德明
Owner SICHUAN QILI LVYUAN WATER TREATMENT TECH CO LTD
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