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Method for optimizing bleaching with chlorine dioxide

A chlorine dioxide and whiteness technology, applied in pulp bleaching and other directions, can solve the problems of low AOX content, low degree of yellowing, and low color of wastewater, and achieve the effect of reducing AOX content

Inactive Publication Date: 2015-06-03
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the main bleaching agent in the ECF bleaching process, chlorine dioxide has the advantages of strong bleaching selectivity, high whiteness, high strength, low yellowing degree, low chromaticity of wastewater, and low AOX content after bleaching, but there is still AOX discharged to water, causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for optimizing chlorine dioxide bleaching, the operation steps are as follows:

[0016] 1. Chlorine dioxide bleaching:

[0017] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 No additive dimethyl sulfoxide was added, the amount of chlorine dioxide was 1.6% of the mass of dry bagasse pulp, the bleaching temperature was 60°C, and the bleaching reaction time was 60 minutes; E p The amount of sodium hydroxide in the first stage is 2.5% of the mass of the dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the dry bagasse pulp, the bleaching temperature is 65°C, and the bleaching reaction time is 90min, D 1 The dosage of chlorine dioxide in the stage is 0.4% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 70° C., and the bleaching r...

Embodiment 2

[0022] A method for optimizing chlorine dioxide bleaching, the operation steps are as follows:

[0023] 1. Chlorine dioxide bleaching:

[0024] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 Add auxiliary agent dimethyl sulfoxide, the amount of dimethyl sulfoxide is 1.00% of the mass of the absolute dry bagasse pulp, the amount of chlorine dioxide is 1.6% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 60°C, and the bleaching reaction time is 60min; E p The amount of sodium hydroxide in the first stage is 2.5% of the mass of the dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the dry bagasse pulp, the bleaching temperature is 65°C, and the bleaching reaction time is 90min, D 1 The dosage of chlorine dioxide in the stage is 0.4% of the mass...

Embodiment 3

[0028] A method for optimizing chlorine dioxide bleaching, the operation steps are as follows:

[0029] 1. Chlorine dioxide bleaching:

[0030] Take 20g of absolutely dry bagasse pulp, prepare a bleaching environment where the mass concentration of bagasse pulp is 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 Add auxiliary agent dimethyl sulfoxide, the dosage of dimethyl sulfoxide is 1.50% of the mass of the absolute dry bagasse pulp, the amount of chlorine dioxide is 1.6% of the mass of the absolute dry bagasse pulp, the bleaching temperature is 60°C, and the bleaching reaction time is 60min; E p The amount of sodium hydroxide in the first stage is 2.5% of the mass of the dry bagasse pulp, the amount of hydrogen peroxide is 1% of the mass of the dry bagasse pulp, the bleaching temperature is 65°C, and the bleaching reaction time is 90min, D 1 The dosage of chlorine dioxide in the stage is 0.4% of the mass...

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PUM

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Abstract

The invention discloses a method for optimizing bleaching with chlorine dioxide. According to the method, the bagasse pulp is taken as a raw material, elemental chlorine-free bleaching is adopted, chlorine dioxide is taken as a main bleaching agent, a D0EpD1 three-section bleaching process is used, an assistant, namely dimethyl sulfoxide, is added in the D0 section, the using amount of dimethyl sulfoxide is 0-1.50% of the mass of absolutely dry bagasse pulp, and the ISO whiteness of the pulp after bleaching and the content of AOX in bleaching wastewater are detected. Compared with the prior art, the ISO whiteness of the pulp after bleaching is slightly reduced, and meanwhile, the content of AOX in the bleaching wastewater is greatly reduced.

Description

technical field [0001] The invention relates to the field of clean pulping and papermaking, in particular to a method for optimizing chlorine dioxide bleaching. Background technique [0002] At present, the AOX (adsorbable organic halide) indicator of papermaking wastewater has been adjusted to a mandatory assessment indicator in the paper industry pollutant discharge standard. However, there are few studies on this in our country, which seriously restricts the development of related technologies and the implementation of policies. How to solve the generation, degradation and harm of AOX in the production process is an urgent problem to be solved in my country's paper industry. In the past two decades, bleaching technology at home and abroad has made great progress and progress. The environmental friendliness of elemental chlorine-free bleaching (ECF) and total chlorine-free bleaching (TCF) processes is basically the same, because the pulp quality of ECF is better and the c...

Claims

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Application Information

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IPC IPC(8): D21C9/14
CPCD21C9/142
Inventor 覃程荣姚双全聂双喜詹磊宋雪萍
Owner GUANGXI UNIV
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