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process took place at the Great Lakes Forest Products Bleach Pulp Mill in Thunder Bay Ontario in the mid-1970s Later Norrstrom carried out a conceptual study of the closed cycle mill for the production of bleached chemical pulp (Parthasarathy and Krishnagoplan 2001) So the system closure in the pulp mill starts with quan-Get price


(PDF) Photodelignification of organosolv chemical pulp

a Universidade Federal de Uberlandia LFQM-DEQUI 38400-902 Uberlandia MG Brazil b UniversitdBordeaux 1 LPPM CNRS URA 348 F-33405 Talence France Received30 May 1995 accepted21 September1995 Abstract Efficient delignification of Eucalyptus grandis organosolv pulp was achieved The process which was chlorine and sulphur free removed 88% Get price



21-3-2003(liquor) Delignification occurs by lignin sulphonation and hydrolysis Buffering usually by the addition of sodium carbonate to the cooking liquor retards the delignification process When about half the lignin is dissolved delignification tends to slow down considerably The pulp is blown to a blow pit at this point and dewatered Get price


Factors limiting oxygen delignification of kraft pulp

Factors limiting oxygen delignification of kraft pulp Leonid G Akim Jorge Luiz Colodette and Dimitris S Argyropoulos Abstract Softwood kraft pulp was subjected to a laboratory one- and three-stage oxygen delignification process Get price


Simulation Of An Oxygen Delignification Reactor In The

Simulation Of An Oxygen Delignification Reactor In The Kraft Pulp Production Process 4th October 2018 • The process of delignification with oxygen is considered as the first part of the bleaching of the cellulosic pulp acting as a bridge between the cooking process and bleaching process Get price


delignification process

The merging parties' activities overlap only in four process islands namely in the field of digesters ('cooking' stage where wood is mixed with chemicals and heated with steam in order to dissolve the lignin) equipment for brown stock washing (washing and cleaning of chemical residues) for oxygen delignification (further delignification Get price


Process for the delignification of a chemical paper pulp

Process for the delignification of a chemical paper pulp by means of an organic peroxy acid according to which the raw pulp arising from the cooking operation is treated with an aqueous solution of this organic peroxy acid whose hydrogen peroxide content does not Get price


for Paper Pulp Applications

for Paper Pulp Applications ABB Automation Delignification is the process by which the majority of lignin is removed from paper pulp Oxygen is used to ensure a less damaging effect on the plant and surrounding environment than more aggressive chemical methods In the bleach plant the remaining lignin is removed by stronger chemicalGet price


Electrochemical Delignification of Wood Pulp Using

electrochemical delignification of wood pulp As currently envisioned a closed bleaching mill will consist of five unit operations electrochemical bleaching pulp washing concentration of wash water removal of non-process elements (NPEs) and wet air oxidation (WAO) of dissolved organic compounds During the bleaching step dilute POMGet price


The Pulp and Paper Making Processes

produce and reclaim chemical agents used in the pulping process collect process and bum lignin and waste wood to produce energy and remove and treat wastes from process water for release into the environment Steps in the Pulp and Papermaking Process Raw Material Preparation Wood received at a pulp mill may be in severalGet price


Delignification Process of Agro

9-8-2011Chemical processes may not be as selective as biological processes but may represent advantages related to required time scalability and process control Biological delignification can be conducted using either microorganisms which produce a set of enzymes that work synergically or purified enzymes Get price


Topochemisytry of delignification of E globulus wood

Topochemisytry of delignification of E globulus wood during the neutral sulfite semi chemical pulping process 1Pereira M 2Patt R 3Kordsachia O 4Rehbein M And 4Koch G 1 Laboratorio de Productos Forestales Departamento de ingeniera Qumica Universidad de Concepcin Get price


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 Get price


Oxygen Delignification Bleaching

Pulp from the Sulphate process is brown in colour as a result of the chemical treatment which dissolves the lignin The bleaching plant transforms the colour of the pulp by treating it in several stages with various chemicals including oxygen chlorine dioxide and peroxide Get price



ABSTRACT A process for the delignification of a chemical paper pulp process for the delignification of a chemical paper pulp by means of an organic peroxyacid which comprises treating the unbleached pulp originating from the cooking operation with an aqueous solution of the peroxyacid whose organic content of hydrogen peroxide does not exceed Get price



OXYGEN DELIGNIFICATION PROCESS CHEMISTRY FOR ACACIA Approved by Dr Arthur J Ragauskas Advisor 1 School of Chemistry Biochemistry Georgia Institute of Technology Dr Jeffery S Hsieh Advisor 2 School of Chemical Biochemical Engineering Georgia Institute of Technology Dr Jeff Empie School of Chemical Biomolecular EngineeringGet price


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-Get price


Chemical pulp fiber line

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 Get price


Oxygen delignification

Oxygen delignification can be carried out in different ways Valmet's way is to optimize the conditions in the OxyTrac system in order to remove more lignin than ever before Our OxyTrac delignification process removes up to 65-70% of the remaining lignin after cooking This result remains unchallenged Get price



Determination of Strength Properties of Norway Spruce After Sulphate cooking Process and Oxygen Delignification 55 pages Saimaa University of Applied Sciences Imatra Unit of Technology Degree Programme in Paper Technology In the chemical pulp part Get price


Oxygen Delignification Kinetics and Selectivity Improvement

(in Chemical Engineering) May 2003 Pulp strength loss during oxygen delignification is caused by cellulose chain OXYGEN DELIGNIFICATION PROCESS 2 2 OXYGEN SPECIES CHEMISTRY Selectivity results on Irving pulp after oxygen delignification for 60 min with chelation acid washing and basic additives Get price


Heap Delignification Process

This solution can be adopted in the pulp and paper industry It is also widely applicable to industries that need a lot of cellulose materials and it offers an economical solution to meet their needs The used solution from delignification process can be recycled in the irrigation again after performing quality control and optimisation Get price


The influence of delignification methods on the overall

Chemical pulp is produced by chemical delignification of wood and non-wood plants After kraft pulping the remaining lignin is removed by oxygen delignification and bleaching to produce higher purity cellulose The chemically purest cellulose is obtained by special cooking methods such as extended sulphite and kraft prehydrolysis Get price


Process for the delignification of unbleached chemical

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 Get price


Effect of the particle size of magnesium hydroxide on the

Abstract Magnesium salt is a known cellulose protector during the oxygen delignification process and it has been widely used in commercial practice The use of magnesium hydroxide as an alkali and cellulose protector in chemical pulp bleaching Pulp Pap Can 104(11) 28–32 Google Scholar Get price


Delignification Is It Silently Destroying Your Timber Home?

In some circumstances delignification is desirable It's utilised in manufacturing such as the chemical process for making wood pulp and paper However when you're talking about a process that dissolves the lignin in the timber in the roof over your head it's a disaster waiting to happen Get price



Journal of Chemical Technology and Metallurgy 54 5 2019 986 WHEAT STRAW SOLVOLYSIS DELIGNIFICATION Iryna Trembus 1 Vita Halysh 1 2 ABSTRACT In this study wheat straw was investigated in order to evaluate it as raw material for pulp production with theGet price


Kraft process

Kraft pulp is darker than other wood pulps but it can be bleached to make very white pulp Fully bleached kraft pulp is used to make high quality paper where strength whiteness and resistance to yellowing are important The kraft process can use a wider range of fiber sources than most other pulping processes Get price


What Are the Different Methods of Delignification?

17-9-2019Oxygen delignification is an oxidation process that relies on oxygen activation to remove the lignin from washed wood pulp On its own the oxygen process is not quite as effective as Kraft pulping removing only about 55% of the lignin It is however often used as a supplementary tandem process to the more traditional Kraft method Get price


Pulp and Paper

Oxygen delignification Used on more than 150 sites worldwide this process allows you to increase the quality of your pulp reduce production costs decrease your bleaching chemical requirements for elements like chlorine dioxide as well as reduce biochemical oxygen demand (BOD) and chemical oxygen demand (COD) Get price


The Pulp and Papaer Industry

mechanical part chemical process that produces a strong pulp It has several disadvantages in terms of complexity and se t up costs as well as having a low pulp yield and producing unpleasant-smelling sulfur compounds but it is still internationally the most widely used pulp and paper process The manufacturing process is outlined below Get price

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