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Bleaching – Innofibre

To get the card (in French) on Bleaching and lignocellulosic material delignification click here To know more about pilot plant bleaching contact Gaston Michaud at 819-376-5011 extension 4536 To know more about laboratory bleaching contact Sylvain Duquette at 819-376-5011 extension 4524 Get price

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Pollution Prevention For The Kraft Pulp And Paper Industry

The advantages of oxygen plus oxygen-extraction stage are described General discussion of oxygen delignification including advantages and disadvantages process pulp yield and effluent reduction The sequence of events leading to the development of a mi 11-scale oxygen/alkali delignification process at medium consistency is described Get price

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18 PEERS Program 051718

Pulp Production ‐ Marina Cohlho University of So Paulo Validation of a Modified Berty Reactor for Studying the Intrinsic Kinetics and Selectivity of Oxygen Delignification of Southern Pine Kraft Pulp ‐ Azadh Pahlevanza University of Maine Session 3 State of the IndustryGet price

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Environmental impact analysis of pulp and paper production

3 2 2 Mechanical pulping 3 3 Bleaching 3 4 Paper Production As a result from the 1990 onwards the use of elemental chlorine in the delignification process was substantially reduced and replaced with ECF (Elemental Chlorine Free) and TCF (Totally Chlorine Free) bleaching processes Environmental impact analysis of pulp and paper productionGet price

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Basic Overview of Pulp and Paper Manufacturing Process

Pulp and paper mills are highly complex and integrate many different process areas including wood preparation pulping chemical recovery bleaching and papermaking to convert wood to the final product Processing options and the type of wood processed are often determined by the final product Get price

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BIOPULPING

Mar 27 2013Development of the biopulping process has reached the pilot scale as far as the use of white-rot fungi for mechanical pulping and sulphite pulping is concerned and has already been tested on a commercial scale with the ascomycete Ophiostoma piliferum for kraft pulpingGet price

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Topochemistry of delignification and its effect on fiber

The catalysed organosolv process is a novel method of pulping that has many advantages over other chemical pulping processes One of the most important advantages is its 6-12 percentage point higher yield of pulp in comparison to other chemical pulping processes Get price

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Pulp Bleaching Today

This book describes the most effective application of chemicals in bleaching It starts with a brief overview of the history of bleaching and then focuses on recent developments The ban of chlorine from bleaching pulp has shifted bleaching to environmentally sound procedures Elementary Chlorine Free bleaching (ECF bleaching) and Totally Chlorine Free bleaching (TCF bleaching) are explained Get price

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1 CHAPTER 1 LITERATURE REVIEW FIBRE MOVEMENT IN

MECHANICAL PULP AND PROCESSES FOR IMPROVEMENT OF STABILITY ABSTRACT Wood is the main source of fibres used industrially to produce paper These fibres are subjected to different chemical or mechanical processes to produce pulp with specific characteristics Mechanical fibres are generally stiff and difficult to collapse Get price

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Control of Pollution in the Pulp and Paper Industry

2 1 2 Pulping Mechanical pulping The pulp is obtained by mechanical operations only Mills and disintegrators are used to convert the wooden chips to slurry The latter is good for a low quality paper or wallpaper Sometimes mechanical pulp is added to the bleached ones to give smoothness and opacity Mechanical pulping is used in 10 per cent of theGet price

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How We Make Kraft Pulp

The essential elements for making kraft pulp are wood fibre water chemicals and heat The Kraft Pulping Process We make kraft pulp by mixing wood fibres with a solution of caustic soda and sodium sulphide and cooking them inside a digester This separates the fibres from the lignin which is a natural glue-like substance that binds them together Get price

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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 Get price

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Topochemistry of delignification and its effect on fiber

The catalysed organosolv process is a novel method of pulping that has many advantages over other chemical pulping processes One of the most important advantages is its 6-12 percentage point higher yield of pulp in comparison to other chemical pulping processes Get price

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Pulp And Paper NESHAP Plain English Description

Existing Sources LVHC system • Pulp washing system • Oxygen delignification system • Decker systems that use any process water other than fresh water or paper machine white water or process water with a concentration of HAPs greater than 400 parts per million by weight (ppmw) • Knotter systems with HAP emissions equal to or greater Get price

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Pulp and Paper Chemistry and Technology Volume 2 Pulping

By grinding wood or wood chips the fibres in the wood are released and a mechanical pulp is obtained In the process some easily dissolved carbohydrates and extractives are lost but on the whole the pulp yield is little affected The pulp yield for mechanical pulp is about 90 to almost 100 % depending on what mechanical pulping method is used Get price

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Bleaching of wood pulp

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 Get price

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The Benefits of Invercote and Incada

The pulp characteristics are customised to suit the board mill The production of folding box board at the Workington mill involves combining inner plies of bleached refiner mechanical pulp made on site with outer plies of bleached chemical pulp The chemical pulp some of which is produced at Iggesund is brought in as dried sheets Get price

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Pulp Archives

Pulp Washing Kempulp continues to be the industry leader for Pulp Washing technology and customer satisfaction Learn More Kempulp is a world leader in oxygen delignification having supplied over one hundred forty medium consistency oxygen delignification installations worldwide Learn More Our Oxygen Delignification Products Get price

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Washing

temperature pH and consistency of the pulp for the following process stage The process The most important mechanisms of washing are dilution dewatering displacement diffusion and flotation though flotation is not usually used in washing due to the difficulties to administer foam Also mechanical forces with these func-tions help pulp washing Get price

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Washing

temperature pH and consistency of the pulp for the following process stage The process The most important mechanisms of washing are dilution dewatering displacement diffusion and flotation though flotation is not usually used in washing due to the difficulties to administer foam Also mechanical forces with these func-tions help pulp washing Get price

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EnviroNews Archives

To date the two most promising delignification technologies for high lignin content pulps consist of using oxygen delignification or modifying the pulping process The use of fungus prior to pulping offers an attractive opportunity for mechanical wood pulp facilities This technology could save an estimated 30% of the energy consumed in Get price

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Pulp and paper applications

In the process of manufacturing mechanical pulps i e stone wood ground pulp (SWG) thermo mechanical pulp (TMP) chemi thermo mechanical pulp (CTMP) and alkaline peroxide mechanical pulp (APMP) hydrogen peroxide plays a key role in the development of the optical properties Hydrogen peroxide remains the principal bleaching agent of mechanical pulps Get price

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Pulp and Paper Chemistry and Technology Volume 2 Pulping

By grinding wood or wood chips the fibres in the wood are released and a mechanical pulp is obtained In the process some easily dissolved carbohydrates and extractives are lost but on the whole the pulp yield is little affected The pulp yield for mechanical pulp is about 90 to almost 100 % depending on what mechanical pulping method is used Get price

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BIOPULPING

Mar 27 2013Development of the biopulping process has reached the pilot scale as far as the use of white-rot fungi for mechanical pulping and sulphite pulping is concerned and has already been tested on a commercial scale with the ascomycete Ophiostoma piliferum for kraft pulpingGet price

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Washing

temperature pH and consistency of the pulp for the following process stage The process The most important mechanisms of washing are dilution dewatering displacement diffusion and flotation though flotation is not usually used in washing due to the difficulties to administer foam Also mechanical forces with these func-tions help pulp washing Get price

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Mechanical pulp bleaching The objective of mechanical pulp bleaching is to improve the brightness and purity of the pulp Because virtually all the wood material is left in the pulp in mechanical pulp production the pulp is bleached with a method that removes as little lignin as possible from it Get price

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Mechanical pulping at a crossroads

Mechanical pulping at a crossroads It seems we are at a crossroads – a turning point – in the development of mechanical pulping While mechanical pulp has many benefits (yield and optical qualities being at the top) the competitiveness of mechanical fibers declines as energy costs rise Get price

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Handbook of pulp (Book 2006) [WorldCat]

-- IV Analytical Characterization of Pulps / Erich Gruber -- 1 Fundamentals of Quality Control Procedures -- 1 1 The Role of QC -- 1 2 Basics of QC-statistics -- 1 3 Sampling -- 1 4 Conditions for Testing and/or Conditioning -- 1 5 Disintegration -- 2 Determination of Low Molecular-Weight Components -- 2 1 Moisture -- 2 2 Inorganic Components -- 2 3 Extractives -- 2 4 Chlorine Compounds -- 3 Get price

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1 CHAPTER 1 LITERATURE REVIEW FIBRE MOVEMENT IN

MECHANICAL PULP AND PROCESSES FOR IMPROVEMENT OF STABILITY ABSTRACT Wood is the main source of fibres used industrially to produce paper These fibres are subjected to different chemical or mechanical processes to produce pulp with specific characteristics Mechanical fibres are generally stiff and difficult to collapse Get price

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Mechanical pulping at a crossroads

Mechanical pulping at a crossroads It seems we are at a crossroads – a turning point – in the development of mechanical pulping While mechanical pulp has many benefits (yield and optical qualities being at the top) the competitiveness of mechanical fibers declines as energy costs rise Get price

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Oxygen Delignification of High

The most important conclusion from carried out studies was finding that fibrous semi product produced in the process of oxygen delignification of pine kappa number 68 pulp with or without the use of peroxy compounds show higher yield (by approx 2 5% on wood) compared with pulps produced by means of conventional method Get price

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bleaching of wood pulp dfinition de bleaching of wood

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 Get price

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Pulp Mills

Pulp mills are large industrial facilities that convert timber wood chips or other wood products into wood pulp that is then used to produce paper cardboard or other products The manufacturing process uses a substantial amount of water and can produce large quantities of wastewater Get price

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Mechanisms of thermomechanical pulp refining

Thermomechanical pulp (TMP) is mainly used for mechanical printing papers such as newsprints as well as uncoated and coated magazine papers The invention and development of thermomechanical pulping process in the 1970's rapidly changed the structure of the world's pulp and paper industry Previously Get price

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