mechanical pulp delignification process

Deep Eutectic Solvent Delignification to Low-energy ...

Deep Eutectic Solvent Delignification to Low-energy Mechanical Pulp to Produce Papermaking Fibers. A novel process based on low-energy mechanical pulp and deep eutectic solvents (DESs) was evaluated with the goal of producing fibers suitable for papermaking. Ideally, these fibers could be produced at much lower costs, especially when applied to ...

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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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Bleaching of wood pulp - Wikipedia

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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Mechanical pulping - Wikipedia

Mechanical pulping is the process in which wood is separated or defibrated mechanically into pulp for the paper industry.. The mechanical pulping processes use wood in the form of logs or chips that are mechanically processes, by grinding stones (from logs) or in refiners (from chips), to separate the fibers.

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Fact sheet Pulp bleaching - storaenso.com

Pulp bleaching. is t he process where wood pulp fibres are chemically treated before paper-making to remove lignin and resins. Pulp bleaching results in white and clean paper products. Totally chlorine free (TCF) bleaching technique uses oxygen delignification in combination with hydrogen peroxide or ozone as the mainbleaching agents.

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(PDF) Enhancing enzyme-mediated hydrolysis of mechanical ...

The influence of deacetylation and delignification were further enhanced when NaOH was supplemented with 3% Na2SO3, resulting in deacetylation, 34% delignification …

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mechanical pulp delignification process - MC World

mechanical pulp delignification process. Contrast of Mechanical Pulping And Chemi. On mechanical pulping process the wood fibers are separated from each other by mechanical energy applied to the wood matrix causing the bonds between the fibers to break gradually and fiber bundles single fibers and fiber fragments to be released It is the mixture of fibers and fiber fragments that gives ...

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Mechanical properties of pulp delignified by deep eutectic ...

The tear index was lower for the treated pulp because delignification caused a decrease in the degree of polymerization that impacted the mechanical properties of pulp. The stiffness of beaten pulp after DES2 (128 mN), DES3 (126 mN), and DES4 (123 mN) treatment is very similar to initial kraft pulp …

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Pretreatment strategies for delignification of sugarcane ...

The process developed by Pellinen et al. (1989) to delignify the kraft pulp and chemithermo-mechanical pulp (CTMP) using Phanerochaete chrysosporium presented delignification times of around two weeks, the kappa number being reduced from 33 to less than 10 for the kraft pulp and the lignin content decreasing from 26.5 to 21.3% for the CTMP.

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Process for reducing anthraquinone requirements in pulping ...

US5871614A - An improved process for delignification of lignocellulosic raw material, such as wood chips, for the production of cellulose pulps for use in the manufacture of paper or paperboard and an improved pulping aid composition for use in said process are disclosed wherein the wood chips are treated in a closed reaction vessel with an alkaline pulping liquor with an amount of a cyclic ...

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Mechanical Pulp Delignification Process

mechanical pulp delignification process. Delignification of refiner mechanical pulps from Albizia. The pulp was then treated by the sulfate process The results were also better than those obtained in previous tests of delignification of refiner mechanical pulp.

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Fungal delignification and biomechanical pulping of wood ...

Biopulping, defined as the treatment of wood chips with lignin-degrading fungi prior to pulping, saves substantial amount of electrical energy during mechanical pulping, results in stronger paper, and lowers the environmental impact of pulping. Optical properties are diminished; however, brightness can be restored readily with peroxide bleaching.

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The Pulp and Paper Making Processes

Bleaching of mechanical pulp is much different than that for chemical pulp. Mechanical pulping leaves the lignin and the cellulose intact, whereas the purpose of chemical pulping is to chemically sepa-rate the lignin from the cellulose fibers and remove it from the pulp. A major advantage of mechanical pulping is the high yields of pulp that can be

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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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Properties of Pulp (Papermaking Pulp)

As we move from full mechanical to full chemical pulping process, strength of pulp and bleachability improves. Strength improves due to less degradation of fibers and bleachability as more lignin is removed in chemical than mechanical pulping processes. Yield: Pulp yield is mainly govern by the pulping process. Mechanical pulping processes ...

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Deep eutectic solvent delignification to low-energy ...

Full Article. Deep Eutectic Solvent Delignification to Low-energy Mechanical Pulp to Produce Papermaking Fibers. Juha Fiskari, a,b, * Rita Ferritsius, a,c Sinke H. Osong, a Anders Persson, b Tomas Höglund, b Peter Immerzeel, a and Magnus Norgren a A novel process based on low-energy mechanical pulp and deep eutectic solvents (DESs) was evaluated with the goal of producing fibers …

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(PDF) Deep Eutectic Solvent Delignification to Low-energy ...

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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Mechanical Pulping - PrintWiki

The above method of producing groundwood pulp is the oldest pulping process. New mechanical pulping methods are reducing the disadvantages without compromising the advantages of mechanical pulping. Refiner mechanical pulping sandwiches wood chips between two revolving disks. Heat due to friction softens the lignin and allows greater separation ...

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THERMO-MECHANICAL PULPING AS A PRETREATMENT FOR ...

Chemical pretreatment such as oxygen delignification ... Process flow of thermo-mechanical pulping pretreatment Soaking, Thermomechanical Pulping and Yield All three biomass types were soaked in water (at room temperature) the night before at a liquid-to-biomass ratio of 10. After 12 hours soaking, the biomass was centri-

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Pulp and Paper Making Process - Assignment Point

Non-sulphur alkaline pulping covers delignification procedures such as, two-stage soda-oxygen process, single-stage oxygen process, and the alkaline-AQ-peroxide process. The two-stage soda-oxygen pulping process involves a high-yield soda cook, followed by a mechanical defibration and a concluding oxygen bleaching in alkaline medium.

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Delignification of refiner mechanical pulps from Albizia ...

Delignification of refiner mechanical pulps from Albizia lebbek and Eucalyptus hybrid by sulphate process. Abstract Barked wood of Albizia lebbek and Eucalyptus hybrid [ E. tereticornis ] was chipped and refiner mechanical pulp prepared by passing chips soaked overnight in water through a 30-cm laboratory disc refiner (the Sprout Waldron disc ...

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Mechanical Pulping and Chemi-mechanical Pulping Comparison

In the mechanical pulping process, the wood fibers are separated from each other by mechanical energy applied to the wood matrix causing the bonds between the fibers to break gradually and fiber bundles, single fibers and fiber fragments to be released.It is the mixture of fibers and fiber fragments that gives mechanical pulp the favorable properties.

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Comparison of Chemical Pulping and Mechanical Pulping

The pulping process is an important link in the papermaking industry. To learn why it is important, we have to start from the pulp. Pulp can be classified mainly into two types by the pulping methods: chemical pulp and mechanical pulp. The chemical pulp is produced through the chemical pulping process, while the mechanical pulp is produced through mechanical pulping.

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Mechanical Pulping - an overview | ScienceDirect Topics

Mechanical pulping is the original form of pulping. It has been largely replaced by chemical pulping, is still used for lower grade papers such as newsprint, and is the only process used for recycled paper (Casey, 1983a).Mechanical pulping relies more so on mechanical actions to separate and develop wood fibers, rather than using chemical means.

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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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Process for bleaching and delignification of ...

1. A process for bleaching and delignification of lignocellulosic pulp with a source of peroxomonosulfuric acid and subsequently with another agent, characterized in that an alkaline acting material is added during the treatment with peroxomonosulfuric acid and/or its salts in order to control the acidity until a final pH of 3 to 5 is obtained, and subsequently subjecting said pulp to an ...

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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.

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Pulp Bleaching Technology - Princeton University

pulp is produced by the kraft process (about 88 percent of the pulp bleached in 1987 was kraft pulp). Very little mechanical pulp has been bleached in the past, however, this is currently changing. Mechani-cal pulp bleaching is growing at more than twice the rate of chemical pulp bleaching worldwide and it is

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Pulping and Papermaking of Non-Wood Fibers | IntechOpen

Jul 21, 2017· In general, the main raw materials of pulp and papermaking industry can be classified into three categories: wood, non-wood, and non-plant (mainly wastepaper), of which non-wood fiber material is an important fiber source in the areas where forest resources are scarce. Nowadays, in the total pulp consumption of the world, the proportions of wood pulp, wastepaper pulp, and non-wood pulp are 63 ...

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