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Mechanical Pulp Delignification Process

  • mechanical pulp delignification process

    mechanical pulp delignification process. The chemical reactions in Kraft pulping process pulp . Jun 30, 2015 · Kraft pulping process is the most used pulping process in the world. In this process lignin goes into the reactions with the cooking liquor chemicals and split into fragment. These fragments dissolved with the solution and wood .

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  • Pulp and Paper Manufacturing Process in the paper industry

    Refiner pulp and thermo-mechanical pulp are produced by chips. These chips are ground by passing them through rapidly rotating in both processes. In the second stage after refining, the pulp is screened, cleaned, and most of the process water is removed in preparation for paper making. Bleaching Process

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  • A Comparative Evaluation of Explosion Hazards in .

    Comparative Evaluation of Explosion Hazards in Chemical and Mechanical Pulp Bleaching Systems B Y P.W. H ART AND. A.W. R. UDIE . Abstract: Three pulp mills in North America using 50% hydrogen peroxide have suffered explosions of pumps, mixers, and tanks. In two instances, alkali-catalyzed decomposition of peroxide is implicated in the explosion.

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  • Mechanical Pulp Archives - BIM Kemi AB

    Wood fibre is a limited resource and our efficient programmes make sure you can produce your high quality mechanical pulp in a cost-effective and sustainable way throughout the whole process. Our pulp experts can help you maximise the utilisation of your raw material – the tree! Through their profound knowledge combined with our chemical solutions, they can add real value to your process and .

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  • Pulp Mill Wastewater: Characteristics and Treatment .

    3.1. Mechanical pulping. The oldest method of mechanical pulping is the groundwood process. In this process, round logs are forced against a rotating pulp stone (revolving at peripheral speeds of 1000–1200 m/min), under specified conditions of pressure and temperature.

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  • Valorization of Alkaline Peroxide Mechanical Pulp by Metal .

    Alkaline peroxide mechanical pulp can be fractionated into cellulose-rich solid fraction to produce sugar and LCNF. The metal ions exhibited excellent catalytic activity and obviously enhanced the degree of delignification, especially when using CuCl 2. The confocal images highlighted the lignin redistribution on the fiber walls, which affected .

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  • (PDF) The effect of delignification on the properties of .

    And the bleaching process was carried out for three more times besides the first treatment like the CRS delignification process, . poplar chemi-mechanical pulp was used as a raw material to .

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  • THERMO-MECHANICAL PULPING AS A PRETREATMENT .

    THERMO-MECHANICAL PULPING AS A PRETREATMENT FOR AGRICULTURAL BIOMASS FOR BIOCHEMICAL CONVERSION Ronalds Gonzalez,* Hasan Jameel, Hou-min Chang, Trevor Treasure, Adrian Pirraglia, and Daniel Saloni The use of thermo-mechanical pulping (TMP), an existing and well known technology in the pulp and paper industry, is proposed as a

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  • Pulp Bleaching Technology - Princeton University

    Pulp Bleaching Technology THE BLEACHING PROCESS Bleaching is the treatment of cellulosic fiber with chemicals to increase brightness (see box 4-A). Brightness may be achieved by either lignin removal (delignification) or lignin decolonization. Lignin remains a major constituent of pulp even after digestion by chemical pulping. For example, kraft

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  • Low consistency refiner - Valmet

    Low consistency refiner. The OptiFiner concept for mechanical pulping, recycled fiber and stock preparation applications focuses on processing to obtain desired fiber properties through accurate refiner gap control. . LC refining - Process and automation upgrades. Turbine housing

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  • Hydrogen peroxide bleaching | pulp paper mill

    Jul 04, 2016 · At first extraction stage we also used oxygen with it. A two-stage process has an advantage in providing a cleaner pulp. The chemistry is very similar to that involved in oxygen delignification. HOO – ion is the active agent of hydrogen peroxide bleaching. This ion is originated by the ionization process. It is a reversible reaction.

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  • 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. These processes and chemistry are also applicable to the bleaching of non-wood pulps, such as those made from bamboo or kenaf

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  • Chapter 8. Pulp and Paper - Rural Tech

    Chapter 8. Pulp and Paper Pulp is the fibrous mass that results when a pulping process ruptures the bonds in the wood structure that hold the woody cells together. Pulping is done mechanically, thermomechanically, chemically, or with combinations of these treatments. Commercial processes are generally classified as mechanical, chemical, or semi-

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  • Delignification - an overview | ScienceDirect Topics

    Pulp is produced from wood by either chemical delignification, mechanical separation of the cells (fibers), or combinations of chemical and mechanical methods. Mechanical pulping methods give much higher yields (80–95% based on the wood) than the chemical methods (40–50% yields).

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  • Peroxide Bleaching - YouTube

    Jul 17, 2015 · This course focuses on peroxide bleaching of chemical pulp, but peroxide is also used extensively for mechanical pulp bleaching. Category . 71 videos Play all Kraft Pulp Process Felipe Torres F.

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  • Pulp & Paper - Magnesia Specialties

    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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  • ANDRITZ acquires KEMPULP

    International technology Group ANDRITZ has acquired the Swedish company KEMPULP, a specialist provider of process technologies for the chemical pulping industry. The company designs and markets technologies used in chemical pulping, including pulp washing, oxygen delignification .

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  • WO1994012721A1 - Process for delignification of .

    The present invention relates to a process for delignifying and bleaching lignocellulose-containing pulp, in which the pulp is delignified with a peracid or a salt thereof, treated with a complexing agent, and subsequently bleached with a chlorine-free bleaching agent. Suitably, delignification is carried out with the strongly oxidising peracetic acid, giving a considerable increase in .

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  • Oxygen delignification process | pulp paper mill

    Jul 28, 2015 · 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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  • Delignification of refiner mechanical pulps from Albizia .

    The results showed that 8% NaOH + Na 2 S gave high yields (around 60%) with strength properties almost equal to those of kraft pulp (yield 45%). The results were also better than those obtained in previous tests of delignification of refiner mechanical pulp using the soda process.

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  • 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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  • GRADES (TYPES) OF PULP - Paperonweb

    This page contains list of various types of pulp based on their pulping process, raw material used or type of bleaching etc. All plant material are basically consist of Cellulose Fiber, Hemicellulose and Lignin, which bind cellulose fibers together. Pulping is nothing but breaking/removing lignin to separate fibers.

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  • A method for integrated optimization of chlorine dioxide .

    Full Article. A Method for Integrated Optimization of Chlorine Dioxide Delignification of Bagasse Pulp. Yongjun Yin, Xueping Song, Chongxin Li, and Shuangxi Nie *. Chlorine dioxide bleaching is an important component of elemental chlorine-free bleaching.

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  • Mechanical pulp - ANDRITZ

    Excellent mechanical pulping solutions Superior pulp quality at reduced energy consumption ANDRITZ knows how to meet the challenge of enhancing fiber quality with economical use of resources and offers complete mechanical pulping systems comprising highly efficient equipment in every process step.

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  • Pulp Mill Wastewater: Characteristics and Treatment .

    3.1. Mechanical pulping. The oldest method of mechanical pulping is the groundwood process. In this process, round logs are forced against a rotating pulp stone (revolving at peripheral speeds of 1000–1200 m/min), under specified conditions of pressure and temperature.

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  • (PDF) Enhancing Yield Through High Kappa Pulping

    Enhancing Yield Through High Kappa Pulping. . chemical-alkaline peroxide mechanical pulping (PRC-APMP) process. Wood chip impregnation and pulp processing was conducted at a .

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  • WO2002088460A1 - Methods to enhance pulp bleaching and .

    A method to enhance brightness in Chemical and Mechanical pulps comprising adding an organic sulfide chelant is described and claimed. A method to enhance delignification in a Chemical pulp comprising adding an organic sulfide chelant is also described and claimed.

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  • Pulp & Paper - Magnesia Specialties

    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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  • Chapter 72 - Pulp and Paper Industry

    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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  • Pulp bleaching today (eBook, 2010) [WorldCat.org]

    Get this from a library! Pulp bleaching today. [Hans Ulrich Suess] -- Pulp bleaching has gone through dramatic changes in the last two decades. The process has moved from a discharge of toxic and poorly biodegradable effluent to a general acceptance of environmentally .

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