Method of applying green chelating agent in paper pulp hydrogen peroxide bleaching

A hydrogen peroxide, chelating agent technology, applied in pulp bleaching, cellulose pulp post-processing, papermaking and other directions, can solve the problems of extended hazard range, difficult compounds, unfavorable human health, etc., to achieve environmental friendliness, improved tear index, The effect of excellent environmental performance

Active Publication Date: 2018-05-01
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, EDTA is a particularly difficult to degrade compound in the water environment. It can transfer heavy metal ions from solid substances to aqueous solutions, extending the harmful range and cycle of these toxic metals.
The use of DTPA may be a factor inducing cancer, which is not good for human health.

Method used

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  • Method of applying green chelating agent in paper pulp hydrogen peroxide bleaching
  • Method of applying green chelating agent in paper pulp hydrogen peroxide bleaching
  • Method of applying green chelating agent in paper pulp hydrogen peroxide bleaching

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A kind of method that green chelating agent is applied in bagasse pulp hydrogen peroxide bleaching, comprises the following steps:

[0026] 1) Chelation treatment (Q segment)

[0027] The Q section uses tetrasodium iminodisuccinate (IDS) as a chelating agent to carry out chelating treatment, specifically: adding tetrasodium iminodisuccinic acid to the bagasse pulp whose slurry concentration is 7wt% carries out chelating treatment as a chelating agent, Wherein, the consumption of tetrasodium iminodisuccinate (IDS) is 1 wt % of the dry pulp of bagasse pulp, the chelation temperature is 70° C., and the reaction time is 50 minutes.

[0028] 2) Hydrogen peroxide bleaching (P segment)

[0029] Step (1) gained bagasse pulp is added H 2 o 2 , NaOH, Na 2 SiO 3 , MgSO 4 Subsequent hydrogen peroxide bleaching is performed. Subsequent hydrogen peroxide bleaching process conditions: H 2 o 2 The amount of NaOH is 3% of the absolute dry pulp mass, the amount of NaOH is 2% of ...

Embodiment 2

[0034] A kind of method that green chelating agent is used in waste paper deinking pulp hydrogen peroxide bleaching, comprises the following steps:

[0035] 1) Chelation treatment (Q segment)

[0036] Section Q uses tetrasodium iminodisuccinate (IDS) as a chelating agent for chelating treatment, specifically: adding tetrasodium iminodisuccinate as a chelating agent to waste paper deinking pulp with a pulp concentration of 10 wt% Chelation treatment, wherein the amount of tetrasodium iminodisuccinate (IDS) is 1wt% of the dry pulp of waste paper deinking pulp, the chelation temperature is 80°C, and the reaction time is 50min.

[0037] 2) Hydrogen peroxide bleaching (P segment)

[0038] The waste paper deinked pulp obtained in step (1) is washed by inter-stage standards and then added with H 2 o 2 , NaOH, Na 2 SiO 3 , MgSO 4 Subsequent hydrogen peroxide bleaching is performed. Subsequent hydrogen peroxide bleaching process conditions: H 2 o 2 The amount of NaOH is 3% of ...

Embodiment 3

[0043] The comparative experiment of bagasse pulp IDS chelation and EDTA chelation comprises the following steps:

[0044] 1) Chelation treatment (Q segment)

[0045]The Q section uses tetrasodium iminodisuccinate (IDS) as a chelating agent to carry out chelating treatment, specifically: adding tetrasodium iminodisuccinic acid to the bagasse pulp of 5wt% in slurry concentration as a chelating agent to carry out chelating treatment, Wherein, the dosage of tetrasodium iminodisuccinate (IDS) is 0.8wt% of the dry pulp of bagasse pulp, the chelating temperature is 70° C., and the reaction time is 60 minutes.

[0046] 2) Hydrogen peroxide bleaching (P segment)

[0047] Step (1) gained bagasse pulp is added H 2 o 2 , NaOH, Na 2 SiO 3 , MgSO 4 Subsequent hydrogen peroxide bleaching is performed. Subsequent hydrogen peroxide bleaching process conditions: H 2 o 2 The amount of NaOH is 3% of the absolute dry pulp mass, the amount of NaOH is 2% of the absolute dry pulp mass, NaOH...

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Abstract

The invention discloses a method of applying a green chelating agent in paper pulp hydrogen peroxide bleaching, and belongs to the technical fields of pulping and papermaking engineering. Specifically, after paper pulp is diluted to a concentration of 5%-10%, IDS with a mass percentage of 0.8%-1.2% of the absolute dry content of the paper pulp is added, mixing is performed uniformly, at the same time the chelation treatment temperature is controlled at 60-80 DEG C, and the reaction time is 50min-70min. According to the method provided by the invention, the IDS is used as the chelating agent for chelating treatment and pulp hydrogen peroxide bleaching, the bleaching effect is equivalent to that of hydrogen peroxide bleaching used conventional chelating agent EDTA, the whiteness of bagasse pulp can be improved by 2-4%, the tensile index can be improved by 5-6%, the burst resistant index can be improved by 20-23%, and the tear index can be improved by 8-10%; and the whiteness of waste paper deinking pulp can be improved by 2-4%, the burst index can be improved by 6-11%, and the tear index can be improved by 4-6%. The method provided by the invention can be used in the production process of paper pulp hydrogen peroxide bleaching.

Description

technical field [0001] The invention belongs to the technical field of pulping and papermaking technology, and in particular relates to a method for applying a green chelating agent (IDS) in pulp hydrogen peroxide bleaching. Background technique [0002] The shortage of wood fiber raw materials for papermaking and environmental pollution have always been obstacles to the sustainable and healthy development of my country's pulp and paper industry. With the increasing shortage of wood resources and the emphasis on the environment, the utilization of non-wood fibers and regenerated plant fibers has attracted great attention from all over the world. Bagasse is a commonly used non-wood fiber raw material for papermaking. It can replace wood fiber for pulp and paper, alleviate the shortage of wood fiber raw materials, and has better pulping performance, easy cooking, and less chemical consumption than wood fiber. Waste newsprint is one of the main resources for recycled plant fib...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/16
CPCD21C9/163
Inventor 万金泉董俊晶马邕文王艳常领山
Owner SOUTH CHINA UNIV OF TECH
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