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A kind of intermediate produced in chlorine dioxide bleaching reaction process and its production method

A technology of chlorine dioxide and reaction process, which is applied in pulp bleaching, papermaking, textiles and papermaking, etc. It can solve the problems that AOX cannot be ultra-low emission, high chlorine dioxide consumption, AOX formation mechanism and the lack of research on reduction technology, etc. , to achieve the effect of reducing organically adsorbable halides, reducing bleaching pollution load, and promoting pulp cleaning and bleaching process

Active Publication Date: 2020-07-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is a lack of research on the formation mechanism and reduction technology of AOX in the chlorine dioxide bleaching process. In the traditional chlorine dioxide bleaching process, the amount of chlorine dioxide is high, AOX cannot be discharged ultra-low, and it is difficult to meet strict environmental protection requirements.

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  • A kind of intermediate produced in chlorine dioxide bleaching reaction process and its production method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Adding a concentration of 0.08mol / L sodium hydroxide solution into 4-hydroxyl-3-methoxyacetophenone, using chromatographic grade sodium hydroxide raw material, to obtain 4-hydroxyl-3-methoxybenzene Ethanone concentration is the solution of 0.02mmol / L, and the solid-liquid ratio of 4-hydroxyl-3-methoxyacetophenone and sodium hydroxide solution is 1:150; Use the sulfuric acid solution that concentration then is 2.0mmol / L to adjust this The pH value of the mixed solution is 2.5 to obtain solution A;

[0024] (2) Take 10 mL of solution A of step (1) and place it in a conical flask, add 10 mL of chlorine dioxide solution with a concentration of 0.20 mmol / L to carry out a simulated bleaching test, the reaction temperature is 65 ° C, the reaction time is 1 min, and the reaction ends Utilize the change of the absorbance of the intermediate in the ultraviolet spectrum analysis reaction liquid afterward, measurement result: the absorbance of the intermediate generated in the ...

Embodiment 2

[0026] (1) Adding a concentration of 0.09mol / L sodium hydroxide solution to 4-hydroxyl-3-methoxyacetophenone, using chromatographic grade sodium hydroxide raw material, to obtain 4-hydroxyl-3-methoxybenzene Ethanone concentration is the solution of 0.03mmol / L, and the solid-to-liquid ratio of 4-hydroxyl-3-methoxyacetophenone and sodium hydroxide solution is 1:125; Then use the sulfuric acid solution that concentration is 2.0mmol / L to adjust this The pH value of the mixed solution was 2.4 to obtain solution A;

[0027] (2) Get 10 mL of solution A of step (1) and place it in a conical flask, add 11 mL of chlorine dioxide solution with a concentration of 2.50 mmol / L to carry out a simulated bleaching test, the reaction temperature is 62 ° C, and the reaction time is 1.5 min. Utilize the change of the absorbance of the intermediate in the ultraviolet spectrum analysis reaction solution after finishing, measurement result: the absorbance of the intermediate generated in the reactio...

Embodiment 3

[0029] (1) Adding a concentration of 0.12mol / L sodium hydroxide solution to 4-hydroxyl-3-methoxyacetophenone, using chromatographic grade sodium hydroxide raw material, to obtain 4-hydroxyl-3-methoxybenzene Ethanone concentration is the solution of 0.04mmol / L, and the solid-liquid ratio of 4-hydroxyl-3-methoxyacetophenone and sodium hydroxide solution is 1:90; Use the sulfuric acid solution that concentration then is 2.0mmol / L to adjust this The pH value of the mixed solution was 2.6 to obtain solution A;

[0030] (2) Get 10 mL of solution A of step (1) and place it in a conical flask, add 12 mL of chlorine dioxide solution with a concentration of 4.30 mmol / L to carry out a simulated bleaching test, the reaction temperature is 68 ° C, and the reaction time is 0.8 min. Utilize the change of the absorbance of the intermediate in the ultraviolet spectrum analysis reaction solution after finishing, measurement result: the absorbance of the intermediate generated in the reaction so...

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Abstract

The invention discloses an intermediate generated in a chlorine dioxide bleaching reaction process and a generation method thereof. The molecular formula of the intermediate is C9H10O3.8ClO2; the generation method comprises the steps that a phenol type lignin model is utilized to replace a lignin structure in unbleached pulp for a chlorine dioxide bleaching reaction, when the reaction is performed, excess chlorine dioxide is added in the phenol type lignin model, so that the phenol type lignin model is completely consumed, and the stable intermediate is rapidly generated in the initial stage of the bleaching reaction. The phenol type lignin model and the chlorine dioxide are used for generating the intermediate in a simulated bleaching environment, which indicates that in the chlorine dioxide bleaching process, lignin is firstly rapidly subjected to a reaction similar to coordination electrochemistry with the chlorine dioxide to generate the sable intermediate, the lignin is fixed in the intermediate, then the intermediate is dissociated, and the lignin begins to be oxidatively degraded. The discovery of the intermediate provides theoretical support for further reduction of organically adsorbable halides in bleaching wastewater of pulping and papermaking enterprises.

Description

technical field [0001] The invention relates to the field of clean pulping and papermaking, and more specifically relates to an intermediate produced in the chlorine dioxide bleaching reaction process and a production method thereof. Background technique [0002] The paper industry occupies an important position in the national economy, and its total output value accounts for about 2% of my country's GDP. Pulp bleaching is an important process link in the pulping and papermaking process. Traditional chlorine bleaching is prone to produce adsorbable organic halides (AOX), which contain carcinogenic and teratogenic dioxins, and the wastewater cannot meet the standard; clean chlorine dioxide bleaching has the characteristics of selective delignification, which can effectively control AOX generation. In modern bleaching chemical pulp mills, the elemental chlorine-free (ECF) bleaching technology with chlorine dioxide as the main bleaching agent has completely dominated. Howeve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/14D21C9/10
CPCD21C9/1026D21C9/14
Inventor 姚双全覃程荣王双飞刘宝杰聂双喜梁辰
Owner GUANGXI UNIV