Method for preparing high-purity chlorine dioxide and sodium chlorite by ferrous sulfide method

A technology of chlorine dioxide and ferrous sulfide, applied in the direction of chlorine oxide and chlorous acid, which can solve the problems of reducing the concentration of chlorine dioxide, reducing the concentration of chlorite, and high production costs, and achieves high conversion rate and excellent reaction conditions Gentle and easy, fast onset results

Inactive Publication Date: 2012-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

Among these methods, some will pollute the generated chlorine dioxide because the reactant is a gas, and some will cause side reactions due to the presence of chlorine ions to generate by-product chlorine, reducing the concentration of chlorine dioxide
And the chlorine dioxide produced will generally entrain sulfur dioxide, chlorine gas, etc. into the chlorine dioxide absorber, which will not only consume lye, but also reduce the concentration of chlorite at the same time
Chinese patent ZL 02115238.1 discloses a preparation method of sodium chlorite, which is to mix and dissolve hydrogen peroxide and solid sodium chlorate in water, add the solution and sulfuric acid to a chlorine dioxide generator, and generate chlorine dioxide And oxygen is sent in the mixed solution that sodium hydroxide and hydrogen peroxide are housed, obtains sodium chlorite product, conversion rate and purity all exceed 95%, but use hydrogen peroxide as reducing agent to prepare chlorine dioxide in this method, lead to higher production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Put 15g of sphenite ore containing 81% (wt.) of ferrous sulfide into a chlorine dioxide reactor after crushing, weigh 106.5g of sodium chlorate and dissolve it in 200mL of water to obtain a sodium chlorate solution, and add 125mL of 98% concentrated sulfuric acid Add 50mL of water to dilute, add sodium chlorate solution and mix evenly, add the mixed solution into the chlorine dioxide reactor filled with ore powder, carry out reduction reaction at 80°C for 1.5h while stirring, and generate chlorine dioxide gas and extreme A small amount of chlorine gas; mix 62mL of 27.5% hydrogen peroxide and 200mL of sodium hydroxide solution with a molar concentration of 5mol / L into the absorber, and pass the gas generated in the chlorine dioxide generator into the absorber, -2~ Absorption was performed at 2°C.

[0025] After the reaction, the final sodium chlorite yield was determined to be 93.8%, and the purity was 97%.

Embodiment 2

[0027] Crush 18.3g of ferrous sulfide and place it in a chlorine dioxide reactor, weigh 106.5g of sodium chlorate and dissolve it in 900mL of water to obtain a sodium chlorate solution, dilute 200mL of 98% concentrated sulfuric acid with 100mL of water and add it to the sodium chlorate solution Mix evenly, add the mixed solution into the chlorine dioxide reactor containing ore powder, carry out the reduction reaction at 50°C for 2 hours while stirring, and generate chlorine dioxide gas and a very small amount of chlorine gas; add 87mL of 27.5% hydrogen peroxide Mix it with 125mL sodium hydroxide solution with a molar concentration of 8mol / L and add it to the absorber, pass the gas generated in the chlorine dioxide generator into the absorber, and absorb it at -5~0°C.

[0028] After the reaction, the final sodium chlorite yield was determined to be 91.5%, and the purity was 95%.

Embodiment 3

[0030] Put 21g of sphenite ore containing 81% (wt.) of ferrous sulfide into a chlorine dioxide reactor after crushing, weigh 106.5g of sodium chlorate and dissolve it in 200mL of water to obtain a sodium chlorate solution, add 50mL of concentrated sulfuric acid After diluting with 50mL of water, add it to sodium chlorate solution and mix evenly, then add the mixed solution into the chlorine dioxide reactor filled with ore powder, carry out the reduction reaction for 2 hours while stirring at 70°C, and generate chlorine dioxide gas and a very small amount of Chlorine gas; mix 99mL of 27.5% hydrogen peroxide and 80mL of sodium hydroxide solution with a molar concentration of 12.5mol / L into the absorber, and pass the gas generated in the chlorine dioxide generator into the absorber, -2~2 Absorb at ℃.

[0031] After the reaction was finished, the final sodium chlorite yield was determined to be 96.2%, and the purity was 95.5%.

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Abstract

The invention discloses a method for preparing high-purity chlorine dioxide and sodium chlorite by a ferrous sulfate method. The method comprises the following steps of: crushing ferrous sulfide; dissolving sodium chlorate into water to obtain sodium chlorate solution; diluting concentrated sulfuric acid by adding water, adding the diluted sulfuric acid into the sodium chlorate solution and uniformly mixing the solution; adding the mixed solution into ferrous sulfide powder; performing reduction reaction when stirring to produce high-purity chlorine dioxide gas; and inputting the gas into mixed absorption liquid consisting of hydrogen peroxide and sodium hydroxide, and thus obtaining the high-purity sodium chlorite solution, wherein the purity of the high-purity sodium chlorite solution is larger than 98 percent. According to the method, due to the adoption of the ferrous sulfide, the chlorine dioxide is obtained by the one-step reaction, and the sodium chlorite can be obtained by the two-step reaction; the conversion rate is up to more than 97 percent, the purity of the obtained chlorine dioxide and sodium chlorite is high, and the method has a simple production process and low cost, and is easy to industrialize.

Description

technical field [0001] The invention belongs to the field of bleaching agents and bactericidal disinfectants, and relates to a preparation method of chlorine dioxide and sodium chlorite, in particular to a method for preparing chlorine dioxide and sodium chlorite by a ferrous sulfate method. Background technique [0002] Ferrous sulfide exists mainly in the form of pyrrhotite in nature. The reduction in ferrous sulfide is negative divalent sulfur element and positive divalent iron element, and each mole of ferrous sulfide can provide 9 moles of electrons. [0003] Sodium chlorite is a white crystal, often yellow-green due to chlorine dioxide, and has two forms: anhydrous and trihydrate, with a transition temperature of 38°C, slightly hygroscopic, and relatively stable at room temperature. Because industrial sodium chlorite contains water and other impurities, it will decompose and release oxygen when heated to 130-140°C or even lower temperature. The alkaline aqueous solut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/10C01B11/02
Inventor 陈赟钱宇
Owner SOUTH CHINA UNIV OF TECH
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