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Method for alkaline hydrogen peroxide bleaching of paper pulp

A hydrogen peroxide and pulp bleaching technology, applied in the field of pulp and paper making, can solve problems such as low bleaching efficiency, and achieve the effect of improving bleaching effect and improving whiteness

Active Publication Date: 2012-06-20
山东济清科技服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The invention aims at the problem of low bleaching efficiency caused by the catalytic decomposition of hydrogen peroxide by transition metal ions in the alkaline hydrogen peroxide bleaching process of high-yield pulp and deinked pulp of waste paper, and provides a method for improving the bleaching efficiency of hydrogen peroxide and improving pulp whiteness. degree method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Masson pine groundwood pulp (SGW) unbleached pulp, whiteness 50% ISO, put in a polyethylene plastic bag and put it in a water bath for hydrogen peroxide bleaching, add chitosan (85% degree of deacetylation) 2kg / ton pulp, H 2 o 2 30kg / ton of pulp, 20kg / ton of sodium hydroxide, 20kg / ton of sodium silicate, pulp concentration 25%, bleaching temperature 75°C, bleaching time 1.5h, bleached pulp brightness 72% ISO.

[0024] Control experiment 1-1: As described in Example 1, the difference is that chitosan is not added in the bleaching process, and other conditions are the same, and the brightness of the obtained bleached pulp is 69% ISO.

[0025] Control experiment 1-2: as described in embodiment 1, the difference is that chitosan is not added in the bleaching process, but the EDTA that adds 2kg / ton pulp, other conditions are identical, the brightness of gained bleached pulp is 70%ISO .

Embodiment 2

[0027] Unbleached pulp after poplar PRC-APMP first stage refining, whiteness 54%ISO, in polyethylene plastic bag and put in water bath and carry out hydrogen peroxide bleaching, add chitosan (deacetylation degree 85%) )1kg / ton pulp, H 2 o 2 50kg / ton pulp, sodium hydroxide 25kg / ton pulp, sodium silicate 30kg / ton pulp, pulp concentration 25%, bleaching temperature 80°C, bleaching time 2.0h, pulp brightness after bleaching 80% ISO.

[0028] Control experiment 2-1: As described in Example 2, the difference is that chitosan is not added in the bleaching process, and the whiteness of the obtained bleached pulp is 77% ISO.

[0029] Control experiment 2-2: As described in Example 2, the difference is that chitosan is not added in the bleaching process, but DTPA of 2 kg / ton of pulp is added, and the brightness of the resulting bleached pulp is 78.5% ISO.

Embodiment 3

[0031]Poplar CTMP unbleached pulp, whiteness 52% ISO, put in polyethylene plastic bag and put in water bath and carry out hydrogen peroxide bleaching, the bleaching medicine that adds is as follows: Chitosan (deacetylation degree 90%) 2kg / ton Pulp, H 2 o 2 40kg / ton pulp, sodium hydroxide 25kg / ton pulp, sodium silicate 25kg / ton pulp, pulp concentration 30%, bleaching temperature 80°C, bleaching time 1.5h, pulp brightness after bleaching 81% ISO.

[0032] Control experiment 3-1: As described in Example 3, the difference is that when no chitosan is added in the bleaching process, the whiteness of the obtained bleached pulp is 78.5% ISO.

[0033] Control experiment 3-2: as described in embodiment 3, the difference is that chitosan is not added in the bleaching process, but EDTA of 4 kg / ton pulp is added, and the brightness of the resulting bleached pulp is 79.5% ISO.

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Abstract

The invention relates to a method for alkaline hydrogen peroxide bleaching of paper pulp. Chitosan with deacetylation degree bigger than 80% is added in the alkaline hydrogen peroxide bleaching process of high yield pulp or deinked pulp to act as the stabilizer of the hydrogen peroxide, and the dosage of the chitosan is 0.5-5kg per ton pulp; and hydrogen peroxide, sodium hydroxide and sodium silicate are added at the same time of bleaching. By adding chitosan in the alkaline hydrogen peroxide bleaching of the paper pulp, the method can improve the bleaching efficiency of the hydrogen peroxide and the whiteness of the paper pulp.

Description

technical field [0001] The invention relates to a pulp bleaching technology, in particular to a hydrogen peroxide bleaching method for high-yield pulp and waste paper deinked pulp, and belongs to the technical field of pulp and papermaking. Background technique [0002] High-yield pulp is used more and more in paper production due to its high yield, low production cost, and high opacity, bulk and stiffness. In addition, in order to save raw materials, waste paper deinking pulp is used more and more. At present, the bleaching of high-yield pulp and deinked pulp mainly adopts hydrogen peroxide bleaching. In addition to hydrogen peroxide, sodium hydroxide or sodium silicate must be added in the hydrogen peroxide bleaching process to make the bleaching proceed under alkaline conditions. . During the pulp hydrogen peroxide bleaching process, the presence of transition metal ions such as iron ions, copper ions and manganese ions will catalyze the ineffective decomposition of hyd...

Claims

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Application Information

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IPC IPC(8): D21C9/16
Inventor 李宗全窦红艳秦梦华傅英娟魏琳
Owner 山东济清科技服务有限公司
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