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AOX generation method for reducing bagasse pulp by adding bleaching auxiliary in chlorine dioxide bleaching process

A chlorine dioxide and bagasse pulp technology, applied in pulp bleaching and other directions, can solve the problems of refractory long-distance migration, toxic bioaccumulation and semi-volatility, and achieve the effect of reducing AOX content

Inactive Publication Date: 2015-06-10
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the ECF bleaching process still generates a small amount of adsorbable organic halides (AOX). AOX is the main persistent organic pollutant (POPs) in the ECF bleaching process, which is toxic, bioaccumulative and semi-volatile, and is difficult to degrade. long-distance migration

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] A method for adding bleaching aids to reduce the generation of AOX in the process of chlorine dioxide bleaching of bagasse pulp, the operation steps are as follows:

[0016] 1. Chlorine dioxide bleaching:

[0017] Take 20g of absolutely dry bagasse pulp, and prepare a bleaching environment with a pulp concentration of 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 Segment does not add additive sulfamic acid, the amount of chlorine dioxide is 1.6% of the mass of 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 of the absolute dry bagasse pulp,...

Embodiment 2

[0022] A method for adding bleaching aids to reduce the generation of AOX in the process of chlorine dioxide bleaching of bagasse pulp, the operation steps are as follows:

[0023] 1. Chlorine dioxide bleaching:

[0024] Take 20g of absolutely dry bagasse pulp, and prepare a bleaching environment with a pulp concentration of 10%, chlorine dioxide D 0 E. p D. 1 The technological conditions of the three-stage bleaching are as follows: D 0 Add additive sulfamic acid, the amount of sulfamic acid is 0.10% of the quality of the absolute dry bagasse pulp, the amount of chlorine dioxide is 1.6% of the quality of the absolute dry bagasse pulp, the bleaching temperature is 60 ℃, 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 o...

Embodiment 3

[0028] A method for adding bleaching aids to reduce the generation of AOX in the process of chlorine dioxide bleaching of bagasse pulp, the operation steps are as follows:

[0029] 1. Chlorine dioxide bleaching:

[0030] Take 20g of absolutely dry bagasse pulp, and prepare a bleaching environment with a pulp concentration of 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 sulfamic acid, the amount of sulfamic acid is 0.20% of the quality of the absolute dry bagasse pulp, the amount of chlorine dioxide is 1.6% of the quality of the absolute dry bagasse pulp, the bleaching temperature is 60 ℃, 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 d...

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PUM

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Abstract

The invention discloses an AOX generation method for reducing bagasse pulp by adding a bleaching auxiliary in the chlorine dioxide bleaching process. According to the method, the bagasse pulp is used as a raw material, element-free chlorine is adopted for bleaching, chlorine dioxide is used as a main bleaching agent, the D0EpD1 three-section bleaching process is utilized, auxiliary sulfamic acid is added to the D0 section, the amount of the adopted auxiliary sulfamic acid is 0-0.20% of the mass of the bagasse pulp absolutely dry, and ISO whiteness of the pulp and the AOX content in bleaching waste water are detected after bleaching is carried out. In comparison with the prior art, the AOX content in the bleaching waste water is reduced greatly while the ISO whiteness of the pulp is slightly reduced after bleaching is carried out.

Description

technical field [0001] The invention relates to the field of clean pulping and papermaking, in particular to a method for reducing the generation of AOX in the chlorine dioxide bleaching process of bagasse pulp by adding a bleaching assistant. Background technique [0002] Pulp and paper companies can achieve the unity of environmental, economic and social benefits by using chlorine dioxide-based elemental chlorine-free (ECF) technology to bleach pulp. North America has fully completed the process of converting from conventional chlorine bleaching to ECF bleaching, and other regions are also converting from elemental chlorine bleaching to ECF bleaching. However, the ECF bleaching process still generates a small amount of adsorbable organic halides (AOX). AOX is the main persistent organic pollutant (POPs) in the ECF bleaching process, which is toxic, bioaccumulative and semi-volatile, and is difficult to degrade. Long-distance migration can occur. With the improvement of s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/14
CPCD21C9/144D21C9/1026D21C9/163
Inventor 覃程荣姚双全聂双喜詹磊宋雪萍
Owner GUANGXI UNIV
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