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Mechanical Pulp Delignification Process

  • The Bleaching of Pulp, 5th Edition By:Peter W. Hart Alan W .

    The Bleaching of Pulp, 5th Edition By:Peter W. Hart Alan W .

    Extraction Delignification for TCF Sequences 4.5. Pulp Quality 4.6. Alternative Alkali Sources for Extraction 4.7. Second Extraction Stage . Process Conditions 9.3.1 Mass transfer of ozone to liquid phase . Paper – Chemical and Mechanical Pulp Bleaching Solutions 13.1. Introduction 13.2. Pulp Production 13.2.1. Wood/Chip Handling

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  • Delignification Expert for Consulting, Expert Witness

    Delignification Expert for Consulting, Expert Witness

    Definition: Delignification - A chemical treatment process in which lignin is separated from the cellulose and carbohydrate materials of wood and woody materials, such as by the bleaching of pulp.

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  • Bleaching of wood pulp - The Full Wiki

    Bleaching of wood pulp - The Full Wiki

    Chemical pulps, such as those from the kraft process or sulfite pulping, contain much less lignin than mechanical pulps, (<5% compared to approximately 40%). The goal in bleaching chemical pulps is to remove essentially all of the residual lignin, hence the process is often referred to as delignification.

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  • November 16, 2011 Bill Schrock U.S. Environmental .

    November 16, 2011 Bill Schrock U.S. Environmental .

    pulping process that uses a mixture of sodium hydroxide (NaOH) and sodium sulfide (Na2S) as the cooking liquor. Figure 2 is a general diagram of the kraft pulping process.

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  • Chemical pulp fiber line | Sulzer

    Chemical pulp fiber line | Sulzer

    Chemical pulp fiber line Unique applications coverage for chemical pulp fiber line Proven pumping, mixing and agitation solutions for your cooking, washing, screening, oxygen delignification, bleaching, and storage processes to ensure process reliability, high efficiency, and low operating costs.

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  • Chapter 72 - Pulp and Paper Industry - ilocis

    Chapter 72 - Pulp and Paper Industry - ilocis

    End products of pulp and paper mills depend on the pulping process, and may include market pulp and various types of paper or paperboard products. For example, the relatively weak mechanical pulp is converted into single-use products such as newspapers and tissue.

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  • Properties of Pulp (Papermaking Pulp) - Paperonweb

    Properties of Pulp (Papermaking Pulp) - Paperonweb

    Pulping Process Though the pulping process used is directly not a pulp property but this is one of the most important parameters used in specifying the pulp. As we move from full mechanical to full chemical pulping process, strength of pulp and bleachability improves.

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  • delignification of refiner mechanical pulps from

    delignification of refiner mechanical pulps from

    Pulping Process and the Potential of Using Non-Wood . . Delignification of refiner mechanical pulp for Albizia . Brief accounts are given of the preparation of refiner mechanical pulp from A. lebbek (using chips soaked overnight in water, and treated in a 30-cm laboratory .

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  • Delignification of wood pulp by a thermostable xylanase .

    Delignification of wood pulp by a thermostable xylanase .

    cal pulping process is extensively modified, and 60% to 90% of it is removed from the wood. The pulp yield varies from 45 to 60% of the wood weight. In all of the pulping processes, the resulting pulp has a characteristic brown color which is primarily due to the residual lignin and lignin derivatives.

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  • Handbook For Pulp & Paper Technologists, Fourth Edition

    Handbook For Pulp & Paper Technologists, Fourth Edition

    4. OVERVIEW OF PULPING METHODOLOGY 36 4.1 Introduction to various Pulping Methods 37 4.2 Market Pulps 41 4.3 Trends in Pulping 43 4.4 Comparison of Pulp Properties and Applications 44 5. MECHANICAL PULPING 46 5.1 Mechanical Pulping Nomenclature 47 5.2 Stone Groundwood Process 47 5.3 Refiner Mechanical Pulping Methods 53 5.4 Thermomechanical .

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  • Process for the delignification of unbleached chemical pulp

    Process for the delignification of unbleached chemical pulp

    Jul 31, 1984 · The invention relates to a process for the delignification of unbleached chemical pulp, comprising the following stages: (a) oxidation of the unbleached pulp with a peroxide, in an alkaline medium with a % ratio of peroxide/pulp with respect to the Kappa index of said pulp which may vary between 0.01 and 0.1 and a pH kept at between 9 and 12, the said oxidation stage being .

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  • KnowPulp - Principle of chemical pulping

    KnowPulp - Principle of chemical pulping

    Purpose of pulping. Purpose of cooking in chemical pulp production is to use chemicals and heat to remove fiber binding lignin so chips defibrate easily. Fibers containing cellulose are tried to keep as long, unbroken and strong as possible. Also wood extractives which can later cause foaming and precipitants in the process are tried to remove.

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  • US20090090478A1 - Selectivity improvement in oxygen .

    US20090090478A1 - Selectivity improvement in oxygen .

    A process to enhance delignification or bleaching in chemical or mechanical pulps comprising generation of singlet oxygen as a separate step and subsequent transport of singlet oxygen to pulp to effect bleaching or brightening of the pulp.

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  • Pulping & Bleaching | Pulp & Paper Canada

    Pulping & Bleaching | Pulp & Paper Canada

    Practically, pulp bleaching is a process that makes the final product whiter or brighter. Technically, bleaching a pulp decreases the visible light absorbance or increases the reflectance of a pulp, resulting in an increase of the measured ISO brightness value. The absorbance of visible light by .

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  • Magnesium Hydroxide for Pulp Bleaching Applications .

    Magnesium Hydroxide for Pulp Bleaching Applications .

    Pulp & Paper Martin Marietta Magnesia Specialties' CellGuard® magnesium hydroxide functions as a cellulose protector and an alkali in mechanical pulp peroxide bleach systems, as well as in the oxygen delignification and extraction stages of chemical pulp bleaching.

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  • CHEMI-MECHANICAL PULP FROM RAPESEED STRAW

    CHEMI-MECHANICAL PULP FROM RAPESEED STRAW

    chemical process. Also, the chemi-mechanical pulping process has the advantages of a mild chemical treatment and high pulping yield compared with the chemical pulping process. . manufacture chemi-mechanical pulp from rapeseed straw by the cold pulping process. Three . on the degree of pulp delignification. Thus, our

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  • THE INSTITUTE OF PAPER CHEMISTRY Appleton, Wisconsin .

    THE INSTITUTE OF PAPER CHEMISTRY Appleton, Wisconsin .

    chemical change, to provide whole individual fibers after delignification. Other processes such as those for making mechanical pulp or thermochemical pulp are less desirable because either too many fibers are broken and/or split or chemical changes such as excessive lignin condensation and carbohydrate hydrolysis occur.

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  • Increasing the efficiency of oxygen delignification for .

    Increasing the efficiency of oxygen delignification for .

    New process to produce delignified pulp based on mechanical pulp as raw material. A simplified and environmentally improved delignification process based on Deep Eutectic Solvents (DESs) for the .

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  • ozonia pulp & paper

    ozonia pulp & paper

    with the pulp. The ligno compounds that are produced in the cooking process are more easily removed with ozone, which reduces the cost of the process. Ozone is a very good candidate for bleaching pulps used in textiles. mechanical pulp Based on large-scale pilot tests, ozone use allows energy savings of more than 25%, while improving

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  • Modification of pine pulp during oxygen delignification by .

    Modification of pine pulp during oxygen delignification by .

    The natural composition of wood pulp fibers, isolated by a chemical or mechanical pulping process, offers a platform for ubiquitous biomaterial applications such as paper, board and composites. Wood and non-wood plant cells primarily consist of three polymeric components: lignin, .

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  • Bleaching of wood pulp - Wikipedia

    Bleaching of wood pulp - Wikipedia

    Bleaching of wood pulp is the chemical processing of wood pulp to lighten its color and whiten the pulp. The primary product of wood pulp is paper, for which whiteness (similar to, but distinct from brightness) is an important characteristic.

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  • CHAPTER 4 Kraft Pulping and Characterization of Strength .

    CHAPTER 4 Kraft Pulping and Characterization of Strength .

    Kraft Pulping and Characterization of Strength Properties of Fungal Treated and Untreated Bamboo Pulps . The delignification process during kraft cooking is known to be divided into three dominating phases (Fig. 4.2) in the production of pulp for bleached grades. . with Ceriporiopsis subvermispora prior to refiner mechanical pulping shows .

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  • Oxygen delignification process | pulp paper mill

    Oxygen delignification process | pulp paper mill

    Oxygen Delignification is one of the most significant and well proven pulp bleaching process for ECF (elemental chlorine free) and TCF (total chlorine free) bleached pulp production. It is the first stage of the bleaching process; in this case oxygen and alkali are used to eliminate a portion of the residual lignin in the pulp after cooking.

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  • Research on the Prehydrolysis Technology of Poplar and .

    Research on the Prehydrolysis Technology of Poplar and .

    The aims of prehydrolysis are mainly removing pentose and decreasing viscosity in the preparation process of dissolving pulp. In this paper, the effect of prehydrolysis in the preparation process of poplar and bamboo dissolving pulp were investigated under different prehydrolysis conditions.

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  • A Comparative Evaluation of Explosion Hazards in Chemical .

    A Comparative Evaluation of Explosion Hazards in Chemical .

    mechanical pulp benefits the process in WZR Z. ays. Mechanical pulps are low drainage pulps and generally have had very little washing that could remove trace metals before peroxide bleaching. the pulp from 3% to over 20% consis-tency removes as much as 88% of the soluble metals, providing siignificant benefit in peroxide

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  • Cooking and fiber line for chemical pulping - valmet

    Cooking and fiber line for chemical pulping - valmet

    Today, there is an ever-increasing demand for environment-friendly pulp production. To provide solutions for mastering this challenge, Valmet has developed a family of intelligent chemical pulping processes.

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  • Selectivity improvement in oxygen delignification and .

    Selectivity improvement in oxygen delignification and .

    Apr 09, 2009 · A process to enhance delignification or bleaching in chemical or mechanical pulps comprising generation of singlet oxygen as a separate step and subsequent transport of singlet oxygen to pulp to effect bleaching or brightening of the pulp.

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  • TECHNO-ECONOMIC ANALYSIS OF BIOREFINERY PROCESS .

    TECHNO-ECONOMIC ANALYSIS OF BIOREFINERY PROCESS .

    approach. Even if pulp fractionation in a mechanical pulp mill seems uninteresting as a way of providing a feedstock for a sugar-platform process, it remains an interesting concept for other platforms such as the production of bio-materials because mechanical pulping keeps the lignin in .

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  • Extractive removal and selectivity improvement by various .

    Extractive removal and selectivity improvement by various .

    Mechanical pretreatment followed by oxygen delignification was not found, to some extent, to affect pulp DZSTS and tensile index losses. The effect of mechanical pretreated pulp on oxygen .

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  • THERMO-MECHANICAL PULPING AS A PRETREATMENT FOR .

    THERMO-MECHANICAL PULPING AS A PRETREATMENT FOR .

    Thermomechanical pulping (TMP), an existing and practiced technology in the pulp and paper industry, can be potentially used as pretreatment of lignocellulosic biomass for ethanol production. Chemical pretreatment such as oxygen delignification and alkaline hydrolysis can be combined with TMP to increase accessible surface area by

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