Process for preparing sodium chlorite

A technology of sodium chlorite and sodium chlorate, applied in the field of bleaching agents, can solve problems such as increased cost, low chlorine dioxide conversion rate, etc., and achieve the effects of reducing dosage, reducing post-treatment procedures, and high target conversion rate

Inactive Publication Date: 2002-11-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, in the process of producing chlorine dioxide by methanol method, sulfur dioxide method, hydrochloric acid method and sodium chloride method, the chlorine dioxide conversion rate of the key component sodium chlorate is relatively low
In order to obtain relatively pure chlorine dioxide, in order to finally obtain high-purity sodium chlorite, it is usually necessary to add a purification device behind the chlorine dioxide generator, which further increases the cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The first step, be 86.3 grams of hydrogen peroxide 86.3 grams of 27.5% by weight and 110 grams of solid sodium chlorate of content 97% and mix and dissolve in water, be mixed with the aqueous solution that sodium chlorate content is 450g / L, this solution and sulfuric acid Continuously drip into the chlorine dioxide generator of negative pressure respectively, the mol ratio of sodium chlorate, hydrogen peroxide and sulfuric acid is 1: 0.6: 2.3, and reaction temperature is maintained at 40 ℃, and reaction pressure is 0.05Mpa, and reaction acidity is 5mol / L to generate a mixed gas of chlorine dioxide and oxygen.

[0019] In the second step, put the mixed absorption solution containing sodium hydroxide and hydrogen peroxide in the absorption tower, the molar ratio of sodium hydroxide and hydrogen peroxide is 1:0.5, chlorine dioxide enters the absorption tower, and the absorption temperature is maintained Between -2 and 2°C, vent oxygen.

[0020] The reaction was carried ou...

Embodiment 2

[0022] The first step, be 86.3 grams of hydrogen peroxide 86.3 grams of 27.5% by weight and 110 grams of solid sodium chlorate of content 97% mix and dissolve in water, be mixed with the aqueous solution that sodium chlorate content is 400g / L, this solution and sulfuric acid Add it to the negative pressure chlorine dioxide generator, the molar ratio of sodium chlorate, hydrogen peroxide and sulfuric acid is 1:0.6:2.5, the reaction temperature is maintained at 80°C, the reaction pressure is 0.095Mpa, and the reaction acidity is 5mol / L , generating a mixture of chlorine dioxide and oxygen.

[0023] In the second step, put the mixed absorption liquid containing sodium hydroxide and hydrogen peroxide in the absorption tower, the molar ratio of sodium hydroxide and hydrogen peroxide is 1:0.65, chlorine dioxide enters the absorption tower, and the absorption temperature is maintained Between -2 and 2°C, vent oxygen.

[0024] The reaction was carried out for 2 hours, and the final s...

Embodiment 3

[0026] The first step, be that 59.3 grams of hydrogen peroxide 59.3 grams of 40% by weight and 110 grams of solid sodium chlorate of content 97% are mixed and dissolved in water, be mixed with the aqueous solution that sodium chlorate content is 600g / L, this solution and sulfuric acid Add it to the negative pressure chlorine dioxide generator, the molar ratio of sodium chlorate, hydrogen peroxide and sulfuric acid is 1:0.9:2.0, the reaction temperature is maintained at 60°C, the reaction pressure is 0.04Mpa, and the reaction acidity is 5mol / L , generating a mixture of chlorine dioxide and oxygen.

[0027] In the second step, put the mixed absorption solution containing sodium hydroxide and hydrogen peroxide in the absorption tower, the molar ratio of sodium hydroxide and hydrogen peroxide is 1:0.6, chlorine dioxide enters the absorption tower, and the absorption temperature is maintained Between -2 and 2°C, vent oxygen.

[0028] The reaction was carried out for 2 hours, and t...

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Abstract

A process for preparing sodium chlorite includes such steps as dissolving hydrogen peroxide and solid sodium chlorate in water, adding the resultant solution along with sulfuric acid to a ClO2 generator to generate the mixture of ClO2 and oxygen, loading the mixed absorbing liquid containing sodium hydroxide and hydrogen peroxide into an absorbing tower, adding ClO2 to the absorbing tower while escaping oxygen, and finally generating sodium chlorite. Its advantages are high output rate (more than 95%) and high purity (more than 95%) of product.

Description

(1) Technical field [0001] The invention relates to the technical field of bleaching agents, in particular to a preparation method of sodium chlorite. (2) Background technology [0002] Sodium chlorite is a strong oxidizing agent, mainly used for bleaching fabrics, fibers and pulp. It has the characteristics of high whiteness and does not damage fibers. It is a mild bleaching agent and can also be used to treat sugar, starch, grease, oil The bleaching of paste and wax also has the functions of treating bacteria in sewage, removing phenol and deodorizing, and can also be used for leather depilation, surface treatment of certain metals, and purification of trace nitric oxide in coke oven gas, etc. Another important use of sodium chlorite is to oxidize and reduce chlorine dioxide in an acidic medium, which itself has the same active ingredient as the stable chlorine dioxide prepared by using sodium percarbonate (SPC) - ClO 2 . [0003] The production process of sodium chlorit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B11/06C01B11/10
Inventor 陈赟江燕斌钱宇
Owner SOUTH CHINA UNIV OF TECH
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