Production for stable chlorinedioxide solution

A chlorine dioxide and production method technology, applied in the direction of chlorine dioxide, etc., can solve the problems of difficulty in producing high-concentration, high-purity stable chlorine dioxide solution, difficult accurate control of process operation, difficult control of reaction process, etc., to achieve stable Continuous operation process, complete conversion of raw materials, and the effect of solving instability

Inactive Publication Date: 2006-01-11
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The shortcoming that above-mentioned production method exists is, three kinds of raw materials are dripped and reacted in the single-stage reaction tank simultaneously, produce local overheating, react insufficiently, easily produce explosion phenomenon, process operation is difficult to accurately control etc. all can cause the speed of chlorine dioxide reaction, The absorption rate and purity decrease, the reaction process is difficult to control, and it is difficult to produce a high-concentration, high-purity stable chlorine dioxide solution. Usually the chlorine dioxide content is 2.0-2.5%, and the chlorine dioxide purity is low

Method used

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  • Production for stable chlorinedioxide solution
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Experimental program
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Effect test

Embodiment 1

[0025] The production product specification concentration was determined to be 2%. First, sodium pyrophosphate, 2-hydroxyphosphonoacetic acid, and urea are made into a composite catalyst in a weight ratio of 1:0.4:0.7; The solution (30%) and the composite catalyst were continuously stirred at normal temperature to be completely dissolved as a composite reaction solution, and the weight ratio of sodium chlorate, hydrogen peroxide, demineralized water and composite catalyst was 1: 0.7: 0.7: 0.008; The composite stable absorption liquid is added to the absorption tower, and the proportions are: sodium carbonate 3.5%; sodium hydroxide 0.5%; hydrogen peroxide 5%; deionized water 91%; , the reaction temperature is 32~35C. After running for 8 hours, 1.15 tons of stable chlorine dioxide aqueous solution was discharged. The calculated raw material consumption cost was 342 yuan per ton of product, the total yield was 89.1%, and the purity of chlorine dioxide in the product was 98.5% me...

Embodiment 2

[0028] The product specification concentration was determined to be 4%. Get the weight proportioning of composite catalyst sodium pyrophosphate, 2-hydroxy acetic acid, urea to be 1: 0.4: 0.6; in the composite reaction solution, the weight ratio of sodium chlorate, hydrogen peroxide, demineralized water and composite catalyst is 1: 0.4: 0.6: 0.65:0.76:0.008; add composite stable absorption liquid to the combined absorption tower, the ratio is sodium carbonate 4%; sodium hydroxide 1%; hydrogen peroxide 8%; deionized water 87%, hydrogen peroxide concentration 30% , adjust the flow rate of the composite reaction liquid to 22L / h, the flow rate of sulfuric acid solution to 26L / h, control the reaction negative pressure of the multi-step reactor at 0.04~0.42Mpa, and the reaction temperature at 32~35℃. After running for 15 hours, 3.07 tons of stable chlorine dioxide aqueous solution was discharged. The calculated raw material consumption cost was 703 yuan per ton of product, the total ...

Embodiment 3

[0030] The product specification concentration was determined to be 8%. The weight ratio of composite catalyst sodium pyrophosphate, 2-hydroxypyranoyl acetic acid and urea is 1: 0.5: 0.1; the weight ratio of sodium chlorate, hydrogen peroxide, demineralized water and composite catalyst in the composite reaction solution is 1: 0.65 : 0.8: 0.008; add composite stable absorption liquid to the combined absorption tower, and the ratio is 5% sodium carbonate; 4.5% sodium hydroxide; 16% hydrogen peroxide; 74.5% deionized water; L / h, the flow rate of sulfuric acid solution is 18.5L / h; the flow rate of pure water is 14L / h; the reaction negative pressure of the multi-step reactor is controlled at 0.04-0.42Mpa, and the reaction temperature is 32-35°C. After running for 8 hours, 1.08 tons of stable chlorine dioxide aqueous solution was discharged, and the calculated raw material consumption cost was 1448 yuan per ton of product, the total yield was 87.9%, and the purity of chlorine dioxid...

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Abstract

A process for preparing stable ClO2 solution includes such steps as preparing composite reactive liquid from H2O2 as reducer, the catalyst prepared from sodium pyrophosphate, 2-hydroxy phosphonoacetic acid and urea, and chlorate of alkali metal, staircase reacting on sulfuric acid solution to generate high-purity ClO2 gas, and absorbing by stable absorbing liquid in absorption tower. Its advantages are high productivity and stability, and low cost.

Description

technical field [0001] The invention relates to a production method of a stable chlorine dioxide solution. Background technique [0002] As an efficient, broad-spectrum, fast, non-toxic sterilizer, deodorant, antifungal agent, food safe agent, water and air purifier and excellent pulp bleaching agent, chlorine dioxide solution has been widely used in the world in recent years. It has been widely used in research and has broad market prospects. At present, the leading domestic processes are sodium chlorite conversion method and methanol reduction method. The raw material and power consumption of the sodium chlorite conversion method are more than 3 times higher than the average foreign level. The methanol reduction method also has complex production equipment and high reaction temperature. , The methanol content in the finished product is easy to exceed the standard, which restricts the popularization and application of stable chlorine dioxide solution. [0003] Chinese pat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B11/02C01B11/02
Inventor 王奎涛张炳烛陈宇鹏
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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