Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for cleanly bleaching chemimechanical pulp

A chemical-mechanical and clean technology, applied in the field of pulp and paper, to achieve the effect of improving whiteness and whiteness stability, reducing bleaching costs, and reducing degradation

Active Publication Date: 2014-12-31
SOUTH CHINA UNIV OF TECH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

reduce environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for cleanly bleaching chemimechanical pulp
  • Method for cleanly bleaching chemimechanical pulp
  • Method for cleanly bleaching chemimechanical pulp

Examples

Experimental program
Comparison scheme
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...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/10D21C9/16
Inventor 李海龙张倩
Owner SOUTH CHINA UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com