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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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  • Summary
  • Abstract
  • Description
  • 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 hazards existing in the prior art by adopting the ternary method of chlorate. Chlorine dioxide can be prepared, which is safe, simple, convenient and efficient

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

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preparation example Construction

[0026] Wherein the preparation method of compound chlorate solution is as follows:

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

[0028] (b) preparing dilute sulfuric acid solution: dilute the concentrated sulfuric acid with water to form a dilute sulfuric acid solution with a concentration of 60-80% by mass. 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 ...

Embodiment 1

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

[0036] Be that the sodium chlorate content is 12.0%, sulfuric acid content is that the composite chlorate solution of 33.0% joins in the chlorine dioxide vessel with the flow rate of 20L / h with metering pump, simultaneously content is the hydrogen peroxide of 27.5% with metering pump at 2.8 The flow rate of L / h is added to the reactor, the temperature of the material is controlled at 60°C, and the reactor is maintained at a negative pressure with a water injector, and the chlorine dioxide is extracted and mixed with water to form a chlorine dioxide solution. The test data are shown in Table 1. :

[0037]

[0038]

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

Embodiment 2

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

[0041] Be that the sodium chlorate content is 14.0%, sulfuric acid content is that the composite chlorate solution of 35.0% joins in the chlorine dioxide generator with the flow rate of 40L / h with metering pump, simultaneously content is the hydrogen peroxide of 27.5% with 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, and the reactor is maintained at a negative pressure with a water injector, 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 output of chlorine dioxide in this embodiment is 4666.3g / h, the conversion rate of main raw material sodium chlorate is 95.3%, and the purity of chlorine dioxide 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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