Mechanical Pulp Delignification Process

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GREEN CHEMISTRY TO ENHANCE PULP BLEACHING

•Applied at cooking Delignification and Bleaching stages •Can be used in grades (Wood Non wood Agriculture) and Recycled pulp mills •Enhances Yield Whiteness and Brightness •Saves costs due to reduced use of chemicals •Improves mechanical properties

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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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Basic Overview of Pulp and Paper Manufacturing Process

Paper production is basically a two-step process in which a fibrous raw material is first converted into pulp and then the pulp is converted into paper The harvested wood is first processed so that the fibres are separated from the unusable fraction of the wood the lignin Pulp

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Paper mill process piping and piping guide PULP MILL

PULP MILL Pulp - the aqueous stuff containing disintegrated cellulose fibre from which paper is made There are two main kinds of pulp mechanical and chemical Mechanical In practice there are two separate bleaching process steps oxygen delignification and final bleaching To measure the lignin content in pulp

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Pulp Bleaching Application for Magnesium Hydroxide

In mechanical pulp bleaching CellGuard OP has successfully replaced caustic soda and sodium silicate to yield significant cost savings for the mill Since Mg(OH)2 is considered a weak alkali compared to caustic there is less BOD and COD generated in the bleach effluent which translates to a higher pulp

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Achieving Efficient pulp washing

Belt washing is a counter flow process where pulp enters the washer area on a wire belt and washing takes place under a series of showers Clean water enters on the opposite end from the pulp and is sprayed on the pulp to displace the liquor in the pulp mat

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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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Correlations between fibre properties and paper properties

2 1 1 Mechanical pulping In the mechanical pulping the fibres are released from the wood logs or wood chips by grinding Depending on what mechanical pulp process that is used the pulp yield is from 90 to almost 100 % It is only some easily dissolved carbon hydrates and extractives that are lost The mechanically fibres

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Book review HANDBOOK OF PULP

Book review HANDBOOK OF PULP Herbert Sixta (Editor) vol 2 delignification is a non-selective process the carbohydrate reactions are included The role of metals in the protection/degradation of cellulose is also mechanical pulping (latency) occurs when fibers are

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Use of Fungi in Pulping wood an Overview of Biopulping

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 are used increasingly because they give much higher yields (80% to 90% based on the wood) than chemcial methods (40% to 50% yields)

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Pulp Bleaching Sequences

Apr 29 2015Globally there are several bleaching sequences are shown in different pulp mills to achieve the bleaching action Different chemicals are used in each stage usually with washing between two stages to removes products The preference of bleaching sequences depends on many things such as pulp categories environment issue operating cost product quality of final bleached pulp

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Peroxide Bleaching of Pulp

Peroxide is often used to reinforce extraction stages in elemental chlorine free (ECF) bleaching sequences Peroxide use is essential to reaching the target brightness in total chlorine free (TCF) bleaching sequences This course focuses on peroxide bleaching of chemical pulp but peroxide is also used extensively for mechanical pulp bleaching

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Topic 3 Mechanical Pulping ppt

Topic 3 – Mechanical Pulping James A Olson Pulp and Paper Centre Department of Mechanical Thermo mechanical pulping (TMP) Chemi thermo mechanical pulping (CTMP) Brightening 2 Mechanical Pulping Fibres mechanically removed from wood matrix Chemical Pulping Lignin holding fibres together is dissolved High intensity process creates

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3

3 2 3 2 1 - Mechanical pulping Various mechanical pulping processes are in use and they generally present comparable results Stone Groundwood Pulping (SGW) This is the oldest mechanical process where logs are forced into contact with a rotating grindstone in the presence of water

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MULTIFUNCTIONAL ALKALINE PULPING DELIGNIFICATION

In this study multifunctional alkaline pulping was suggested to produce different pulp grades at one mill site ranging from high-yield paper pulp to high-purity dissolving pulp In all process modifications sulfur was successfully replaced by anthraquinone Autohydrolysis and alkaline pre-extraction were applied to

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Pulp and Paper Mills

Mechanical pulp can be used without bleach-ing to make papers for applications in which low brightness is acceptable—primarily newsprint However for most for copy-ing and for some packaging grades the pulp has to be bleached For mechanical pulps most of the original lignin in the raw pulp is retained but is

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Properties of Pulp (Papermaking Pulp)

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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Pulp Archives

Pulp is all about the knowledge of fibre As a pulp producer you are facing many challenges – variable fibre supplies sources and qualities combined with the need to meet regulatory demands and quality improvements while reducing overall operating costs to mention just a few With BIM at your side you have access to our chemical expertise that can help you in analysing and optimising your

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Usage in the pulp and paper industry Europiren B V

Magnesium Hydroxide in the pulp and paper industry BleachMag protects cellulose and fibers in mechanical pulp peroxide bleaching and in delignification during chemical pulp bleaching BleachMag is a new and efficient reagent based on natural magnesium hydroxide Mg(OH)2

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Pulp and Paper Industry

Kraft pulp Chemical pulp that has been manufactured using sodium sulfate as the main cooking chemical Lignin This is the binding substance in natural fibers and is a complex organic polymer with an irregular structure Mechanical pulp Papermaking pulp made entirely by mechanical means from various raw materials i e by grinding wood against an abrasive or by processing wood

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Comparison of Chemical Pulping And Mechanical Pulping

In the papermaking industry the pulping process is an important technology When talking about it we have to start from pulp Generally pulp can be classified into two main types chemical pulp and mechanical pulp Surely still there are other types of pulp actually

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PULPING PROCESS__

PULP GRADES Chemical Pulp 1 Kraft and soda processes 2 Sulfite process Mechanical Pulping 1 SGW (Stone ground wood) 2 PGW (Pressure ground wood) 3 TMP (Thermo mechanical pulp) Chemi-mechanical pulping chemigroundwood cold soda CTMP(Chemi-thermo mechanical pulp) Semichemical pulping NSSC high yield sulfite high yield kraft

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Kappa number of pulp

Nov 25 2016The Kappa number of pulp is an indication of the lignin content or bleachability of pulp We use it to estimate the required amount of bleach chemicals to achieve targeted brightness If the kappa number value is higher then the required bleaching chemicals are also higher

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PULP BLEACHING CONTROL AND OPTIMIZATION

PULP BLEACHING CONTROL AND OPTIMIZATION Pulp used in the paper making process can be made whiter by several methods These meth-ods can be grouped in two categories bleaching Many mechanical pulp mills inject hydrosulflte at two locations in the process in order to control the

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KappaEye – PulpEye

Depending on the mill's process and pulp grades produced sample points can be anywhere in the fibre line from the digester blow line to the finished bleached or unbleached pulp Benefits Continuous Kappa number measurements of cooking delignification and bleaching processes reduce process deviations from target values

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Sulfate cooking

dominating and continuously improving pulping process Gran Annergren och Ulf Germgrd a commercially dominating and continuously improving pulping process WWW KAU SE Sulfate cooking – now a dominating wood but then in considerable competition with mechanical pulping The latter had however somewhat higher demands on the wood

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Chapter 8 Pulp and Paper

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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Development Of Pulp Bleaching Processing Technology

Hyposulphite is a typical reduction bleaching agent At the beginning of 1930s it was used for bleaching the mechanical pulp and then waste paper deinking pulp and some subtraction pulps New Development of The Pulp Bleaching Processing Technology (You may want to learn more about Waste Paper Pulp Production Line) Two-stage oxygen delignification

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Methane potentials of the Swedish pulp and paper industry

1 THE METHANE POTENTIAL OF THE SWEDISH PULP AND PAPER INDUSTRY – A SCREENING OF WASTEWATER EFFLUENTS Eva-Maria Ekstrand1† Madeleine Larsson1†* Xu-Bin Truong2 Lina Cardell2 Ylva Borgstrm3 Annika Bjrn1 Jrgen Ejlertsson1 2 Bo H Svensson1 Fredrik Nilsson3 Anna Karlsson2 1Dep of Thematic Studies Water and Environment Linkping University 581 83

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TECHNO

tation from black liquor [8] Mechanical pulping is by definition pulping with mini-mal delignification According to Bier-mann [5] mechanical pulping has yields between 85% and 97% Many mechani-cal pulp mills achieve pulp yields greater than 95% using state-of-the-art thermo-mechanical pulping (TMP) Biorefinery

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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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Mechanical pulp bleaching Europiren B V

This new method of mechanical pulp bleaching is based on natural magnesium hydroxide and aims to protect the cellulose fibres in mechanical pulp peroxide bleaching and in delignification during chemical pulp bleaching On the one hand this innovative technique lowers the costs of your pulp bleaching process on the other hand it is an

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