AU2019100789A4 - A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide - Google Patents

A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide Download PDF

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AU2019100789A4
AU2019100789A4 AU2019100789A AU2019100789A AU2019100789A4 AU 2019100789 A4 AU2019100789 A4 AU 2019100789A4 AU 2019100789 A AU2019100789 A AU 2019100789A AU 2019100789 A AU2019100789 A AU 2019100789A AU 2019100789 A4 AU2019100789 A4 AU 2019100789A4
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pulp
hydrogen peroxide
hemicelluloses
dosage
minutes
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AU2019100789A
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Lizi Li
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Li Lizi Dr
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Li Lizi Dr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/16—Bleaching ; Apparatus therefor with per compounds
    • D21C9/163—Bleaching ; Apparatus therefor with per compounds with peroxides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1026—Other features in bleaching processes
    • D21C9/1042—Use of chelating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/10—Bleaching ; Apparatus therefor
    • D21C9/1057—Multistage, with compounds cited in more than one sub-group D21C9/10, D21C9/12, D21C9/16

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

The present invention relates to a method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide, comprising the steps of: (1) a chelation pretreatment (Q Stage); (2) washing the pulp; (3) a hydrogen peroxide bleaching process (P Stage); (4) washing of pulp to neutral pH.

Description

Description
A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide
FIELD [0001] The present invention relates to a method for bleaching pulp adsorbed with hemicelluloses. It belongs to the technical field of pulping and papermaking technology.
Background technique [0002] In the current trend for a more effective utilization of biomass, more and more attention has been paid to the exploitation of hemicelluloses as strength-enhancing additives for paper. Adsorption of pre-isolated hemicelluloses modifies the surface morphology and surface chemistry of cellulose fibers, which has a positive effect on improving strength properties of paper. Besides, adsorbed hemicelluloses are spontaneously beneficial to other paper/pulp properties, such as beatability, wettability, and resistance to hornification.
[0003] However, the hemicelluloses adsorbed on fiber surface reduces the brightness of paper remarkably due to the lignin residues in extracted hemicelluloses. Because there are strong chemical and physical interactions between hemicelluloses and lignin in wood, and the socalled lignin carbohydrate complexes (LCC) are well known. The remaining lignin in the extracted xylan fractions has a much closer linkage with hemicelluloses. Therefore, an applicable bleaching process is needed to achieve both enhanced strength and high brightness after the adsorption of hemicelluloses on pulp fibers.
[0004] These bleaching processes are based on oxygen-derived compounds, among which, hydrogen peroxide has proved to be a highly efficient and competitive bleaching chemical in terms of delignification efficiency, low costs, and reducing ecological impact.
SUMMARY [0005] To overcome the deficiencies of the prior art, the present invention provides a new method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide, which is able to achieve both enhanced strength and high brightness after the adsorption of hemicelluloses on pulp fibers. The present invention is applicable for all pulping and papermaking process.
[0006] The present invention of bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide, comprising the steps of: (1) chelation pretreatment (Q Stage); (2) washing of pulp; (3) hydrogen peroxide bleaching process (P Stage); (4) washing of pulp to neutral pH.
[0007] The pulp slurry in this context refers suspension of any fiber-based pulp, which can be formed from wood-based raw materials such as hardwood raw material or other raw material containing cellulose fibers. The fiber suspension can be a chemical fiber-based mass formed
2019100789 20 Jul 2019 by a method in which the fibers are separated from each other by chemical process, such as the sulphate process, the soda process, and so on. Alternatively, the pulp suspension can be formed by a mechanical method such asTMP, PGW, CTMP and so on.
[0008] The pulp concentration in step (1) is preferably from 5% to 15%.
[0009] The treatment time in step (1) is preferably between 30 minutes and 60 minutes.
[0010] The dosage of DTPA in step (1) is preferably between 0.30% and 0.50%.
[0011] The temperature in step (1) is preferably between 50°C and 90°C.
[0012] The pulp concentration in step (3) is preferably from 5% to 15%.
[0013] The treatment time in step (3) is preferably between 30 minutes and 60 minutes.
[0014] The dosage of H2O2 in step (3) is preferably at 2.0%.
[0015] The dosage of Na2SiO3 in step (3) is preferably at 3.0%.
[0016] The temperature in step (3) is preferably between 40°C and 60°C.
[0017] The initial pH in step (3) is preferably at 11.
[0018] Compared with the prior art, advantages of the present invention include:
[0019] 1. The brightness of paper is largely increased by the method in this invention, while the strength properties are remained. Therefore, the quality of paper and paper product is improved.
[0020] 2. The cost of the pulp production is reduced, because it makes the utilization of hemicelluloses feasible.
[0021] 3. The method in this invention can be easily industrialized.
[0022] 4, The method in this invention is environment-friendly.
Detailed ways [0023] Detailed description of the present invention is given by the following further detailed examples. But the scope of the present invention should not be limited to the following examples.
[0024] Example 1:
2019100789 20 Jul 2019 [0025] A suspension of kraft pulp is prepared. The chelation stage is processed with the pulp concentration of 10%, treatment time of 30 minutes, DTPA dosage of 0.30%, and temperature of 70°C. The pretreated pulp is washed. The hydrogen peroxide bleaching stage is then performed with the pulp concentration of 10%, treatment time of 30 minutes, H2O2 dosage of 2.0%, Na2SiO3 dosage of 3.0%, temperature of 40°C, and initial pH of 11. The bleached pulp is washed to neutral pH. The paper sheet is fabricated by the above pulp slurry then. The optical and strength properties of the paper sheet are characterized by TAPPI standard method.
[0026] The brightness is increased by 8%. The tensile strength is increased by 4.3%. The burst strength is increased by 4.8%.
[0027] Example 2:
[0028] A suspension of kraft pulp is prepared. The chelation stage is processed with the pulp concentration of 5%, treatment time of 30 minutes, DTPA dosage of 0.30%, and temperature of 70°C. The pretreated pulp is washed. The hydrogen peroxide bleaching stage is then performed with the pulp concentration of 10%, treatment time of 90 minutes, H2O2 dosage of 2.0%, Na2SiO3 dosage of 3.0%, temperature of 60°C, and initial pH of 11. The bleached pulp is washed to neutral pH. The paper sheet is fabricated by the above pulp slurry then. The optical and strength properties of the paper sheet are characterized by TAPPI standard method.
[0029] The brightness is increased by 10%. The tensile strength is remained. The burst strength is remained.
[0030] Example 3:
[0031] A suspension of kraft pulp is prepared. The chelation stage is processed with the pulp concentration of 10%, treatment time of 30 minutes, DTPA dosage of 0.30%, and temperature of 60°C. The pretreated pulp is washed. The hydrogen peroxide bleaching stage is then performed with the pulp concentration of 10%, treatment time of 60 minutes, H2O2 dosage of 2.0%, Na2SiO3 dosage of 3.0%, temperature of 40°C, and initial pH of 11. The bleached pulp is washed to neutral pH. The paper sheet is fabricated by the above pulp slurry then. The optical and strength properties of the paper sheet are characterized by TAPPI standard method.
[0032] The brightness is increased by 15%. The tensile strength is increased by 6.2%. The burst strength is increased by 4.5%.
[0033] Example 4:
[0034] A suspension of kraft pulp is prepared. The chelation stage is processed with the pulp concentration of 5%, treatment time of 120 minutes, DTPA dosage of 0.30%, and temperature of 60°C. The pretreated pulp is washed. The hydrogen peroxide bleaching stage is then performed with the pulp concentration of 10%, treatment time of 120 minutes, H2O2 dosage of 2.0%, NazSiOa dosage of 3.0%, temperature of 50°C, and initial pH of 11. The bleached pulp is washed to neutral pH. The paper sheet is fabricated by the above pulp slurry then. The optical and strength properties of the paper sheet are characterized by TAPPI standard method.
[0035] The brightness is increased by 17%. The tensile strength is increased by 1.2%. The burst strength is increased by 1.8%.

Claims (3)

  1. Claims
    1. A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide, comprising the steps of: (1) chelation pretreatment (Q Stage); (2) washing of pulp; (3) hydrogen peroxide bleaching process (P Stage); (4) washing of pulp to neutral pH.
  2. 2. The method as recited in claim 1, wherein the chelation stage is processed with the pulp concentration of 5% to 15%, treatment time of 30 minutes to 60 minutes, DTPA dosage of 0.30% to 0.50%, and temperature of 50°C to70°C.
  3. 3. The method as recited in claim 1, wherein the hydrogen peroxide bleaching stage is then performed with the pulp concentration of 5% to 15%, treatment time of 30 minutes to 60 minutes, H2O2 dosage of 2.0%, Na2SiO3 dosage of 3.0%, temperature of 50°C and 90°C, and initial pH of 11.
AU2019100789A 2019-07-20 2019-07-20 A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide Active AU2019100789A4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2019100789A AU2019100789A4 (en) 2019-07-20 2019-07-20 A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AU2019100789A AU2019100789A4 (en) 2019-07-20 2019-07-20 A method for bleaching pulp adsorbed with hemicelluloses using hydrogen peroxide

Publications (1)

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AU2019100789A4 true AU2019100789A4 (en) 2019-08-22

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