Ionic liquid-based ECF bleaching protection agent for paper pulp

An ionic liquid, pulp bleaching technology, applied in pulp bleaching, cellulose pulp post-treatment, washing/replacement pulp treatment liquid, etc. Stable, easy to promote, and strong practicability

Active Publication Date: 2020-02-04
QILU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in follow-up research, the inventors found that: due to the addition of ultrasonic technology, the effect of ionic liquid is to strengthen the lignin removal effec

Method used

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  • Ionic liquid-based ECF bleaching protection agent for paper pulp
  • Ionic liquid-based ECF bleaching protection agent for paper pulp
  • Ionic liquid-based ECF bleaching protection agent for paper pulp

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0067] Example 1:

[0068] Proceed as follows:

[0069] (1) Cooking: eucalyptus chips are 21% alkali, Na 2 O meter; vulcanization degree is 25%, liquid ratio is 1:5, and the maximum cooking temperature is 170℃ for cooking. Venting is performed at 105°C, the heating time is 90 minutes, and the holding time is 90 minutes. After cooking, the pulp is fully washed and screened to obtain pulp.

[0070] (2) Pretreatment of protective agent: accurately weigh three bags of 25g of the above-mentioned eucalyptus sulphate slurry (calculated as dry pulp), and measure 10% triethylammonium hydrogen sulfate ionic liquid (TEA-HSO 4 )-Based bleach protection agent (the bleach protection agent except TEA-HSO 4 In addition, a small amount of anhydrous magnesium sulfate (0.6%) is added to the slurry, the slurry concentration is adjusted to 10% in a polyethylene bag, and the mixture is kneaded until uniform.

[0071] (3) ECF bleaching: bleach the pulp after the above pretreatment. The bleaching process is...

Example Embodiment

[0081] Example 2:

[0082] Proceed as follows:

[0083] (1) Cooking: The condition is 21% alkali, Na 2 O meter; vulcanization degree 25%, liquid ratio 1:5, the highest cooking temperature is 170°C, the gas is released at 105°C, the heating time is 90min, and the holding time is 90min; after cooking, the pulp is fully washed and screened.

[0084] (2) Ultrasound and ionic liquid treatment: accurately weigh three bags of 25g slurry (based on absolute dry pulp), and measure 5%, 10%, and 15% of 1-butyl 3-methyl hydrogen sulfate ionic liquid ( BMIM-HSO 4 ) Add to the slurry, adjust the slurry concentration to 10% in a polyethylene bag, and knead until it is evenly mixed

[0085] (3) ECF bleaching: bleach the pulp after the above pretreatment. The bleaching process is ODP bleaching process. The steps are: first perform O-stage oxygen delignification on eucalyptus kraft pulp, the process is: pulp concentration 10%, NaOH Dosage 3%, oxygen pressure 0.5MPa, temperature 100℃, time 60min, MgSO 4...

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Abstract

The invention relates to an ionic liquid-based ECF bleaching protection agent for paper pulp. The ionic liquid-based bleaching protection agent is adopted to pretreat eucalyptus sulfate slurry, and then ECF bleaching is performed, wherein the addition amount of the bleaching protection agent is 5%-15% of the paper pulp. Though treatment, lignin in fiber can be dissolved effectively, and a protective layer on the surface of the fiber is formed by the lignin, so that the efficiency of subsequent bleaching is improved, and the fiber is protected in the bleaching process. Through the pretreatment,the content of cellulose in the pulp can be increased, the content of the lignin is reduced at the same time, and the physical strength of finished paper is improved, so that the application range ofeucalyptus and other broad-leaved wood is widened; and through the treatment, the bleaching effect is improved, the amount of a bleaching agent is reduced, the bleaching efficiency is improved, and pollution is reduced. The ionic liquid-based ECF bleaching protection agent has the advantages of simple operation, an obvious effect, high practicability, small pollution and easy popularization.

Description

technical field [0001] The invention belongs to the technical field of papermaking, and specifically relates to an ionic liquid-based pulp bleaching protectant. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] With the large-scale, automation and high-efficiency of papermaking technology and equipment, and the papermaking industry's gradual emphasis on clean production, circular economy, environmental pollution reduction, and promotion of sustainable development, the elemental chlorine-free (ECF) bleaching technology has become more mature. At present, in order to reduce the generation of pollutants, paper mills mostly adopt the methods of deep delignification, oxygen deli...

Claims

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Application Information

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IPC IPC(8): D21C9/10D21C9/16D21H11/04
CPCD21C9/1005D21C9/1057D21C9/163D21H11/04D21C9/101D21C1/06D21C9/02
Inventor 杨桂花陈嘉川齐乐天吉兴香吕高金彭建民
Owner QILU UNIV OF TECH
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