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Method for cleanly bleaching chemimechanical pulp

A chemical-mechanical and clean technology, applied in the field of pulp and paper making, to achieve the effect of reducing degradation, convenient transportation, and reducing the pollution load of waste water

Active Publication Date: 2013-01-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

reduce environmental pollution

Method used

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  • Method for cleanly bleaching chemimechanical pulp
  • Method for cleanly bleaching chemimechanical pulp

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Cleaning and Bleaching Method of Poplar CTMP Pulp

[0027] (1) Bleaching with urea peroxide

[0028] A single tower was used to bleach poplar CTMP pulp with urea peroxide, and magnesium sulfate, sodium silicate, EDTA and urea peroxide were added to the pulp before entering the tower. The dosage of magnesium sulfate is 1.0kg / t dry pulp, the dosage of sodium silicate is 25kg / t dry pulp, the dosage of EDTA is 2.0kg / t dry pulp, and the dosage of urea peroxide is 100kg / t dry pulp (the peroxidized The hydrogen content is 31.5%); the pulp concentration is adjusted to 12% before entering the tower; the reaction time of the pulp in the tower is 90min; the reaction temperature is 85°C. After the reaction, the pulp is washed by a pulp washer and then enters the next section.

[0029] (2) Xylanase treatment

[0030] Use 1% dilute sulfuric acid to adjust the pH value of the washed pulp to 6.5, then add xylanase (solid) into the mixer, the enzyme dosage is 90g / t dry pulp, mix well...

Embodiment 2

[0034] Clean Bleaching Method for Pine CTMP Pulp

[0035] (1) Bleaching with urea peroxide

[0036] The pine CTMP pulp was bleached with urea peroxide in a single tower, and magnesium sulfate, sodium silicate, EDTA and urea peroxide were added to the pulp before entering the tower. The dosage of magnesium sulfate is 1.0kg / t dry pulp, the dosage of sodium silicate is 30kg / t dry pulp, the dosage of EDTA is 2.5kg / t dry pulp, and the dosage of urea peroxide is 120kg / t dry pulp (the peroxidized The hydrogen content is 31.5%); the pulp concentration is adjusted to 12% before entering the tower; the reaction time of the pulp in the tower is 120min; the reaction temperature is 85°C. After the reaction, the pulp is washed by a pulp washer and then enters the next section.

[0037] (3) Xylanase treatment

[0038] Use 1% dilute sulfuric acid to adjust the pH value of the pulp to 6.5, then add xylanase (solid) into the mixer, the enzyme dosage is 80g / t dry pulp, mix well and send to th...

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Abstract

The invention discloses a method for cleanly bleaching chemimechanical pulp. The method comprises the following steps of: firstly, bleaching with carbamide peroxide: adding magnesium sulfate, sodium silicate, EDTA (Ethylene Diamine Tetraacetic Acid) and carbamide peroxide in chemimechanical pulp, adjusting the concentration of paper pulp to 10-15 percent, feeding the paper pulp into a bleaching tower for bleaching and washing after the reaction is ended; and secondly, treating with xylanase: adjusting the pH value of the washed paper pulp to 6.0-7.0, then adding the xylanase, controlling the concentration of paper pulp to 8-12 percent, uniformly mixing, carrying out enzyme treatment and then washing. The carbamide peroxide adopted by the method disclosed by the invention is a novel paper pump bleaching agent and has the advantages of convenience in package and transportation, favorable stability, no addition of alkaline for bleaching, high whiteness of the bleached paper pulp and the like. When the method disclosed by the invention is used for cleanly bleaching the chemimechanical pulp, the whiteness and the whiteness stability of the paper pulp can be improved; meanwhile, the formation of oxalate in the bleaching process is reduced; and the pollution load of wastewater generated by bleaching is reduced.

Description

technical field [0001] The invention relates to a pulp bleaching technology, in particular to a method for cleaning and bleaching chemical mechanical pulp, especially CTMP chemical mechanical pulp bleaching, and belongs to the technical field of pulp and papermaking. Background technique [0002] At present, the shortage of raw material resources, energy shortage and serious pollution are the main problems restricting the development of my country's paper industry. It is one of the effective ways to develop the paper industry to vigorously develop the pulping method with high yield, less pollution and low energy consumption. Chemimechanical pulp has become the development trend of the pulp and paper industry due to its advantages of high pulp yield, good strength and low energy consumption. Chemimechanical pulp makes full use of wood raw material resources, and its paper has high bulk, high opacity and good printing adaptability. In addition, no or less pulping chemicals a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/10D21C9/16
Inventor 李海龙张倩
Owner SOUTH CHINA UNIV OF TECH
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