Last edited by Shaktinos
Tuesday, October 13, 2020 | History

3 edition of Bleaching technology for chemical and mechanical pulps found in the catalog.

Bleaching technology for chemical and mechanical pulps

Bleaching technology for chemical and mechanical pulps

  • 304 Want to read
  • 19 Currently reading

Published by Miller Freeman in San Francisco, CA .
Written in English

    Subjects:
  • Wood-pulp -- Bleaching

  • Edition Notes

    Includes bibliographical references and index

    Statementedited by Ken L. Patrick
    SeriesPulp & paper focus book, Pulp & paper focus book
    ContributionsPatrick, Ken L
    The Physical Object
    Paginationvi, 168 p. :
    Number of Pages168
    ID Numbers
    Open LibraryOL14666247M
    ISBN 100879302461

      It saves chlorine leading to lower chemical costs and reduction in toxic effluents. xylanase pretreatments for kraft bleaching have been commercialized (Tolan and Guenette, ; Viikari et al., ). The xylanase pretreatments of kraft pulps has reduced AOX discharges by % depending on the furnish and the type of pulping.   Volume 2 focuses on creating an understanding of the chemical and technical processes involved in the production of pulp. The work treats. wood handling, i.e. barking, chipping, storage and screening processes, chemistry and technology during mechanical and chemical pulp production, including pulping and bleaching chemistry and technology,Reviews: 2.

    bleaching technology for manufacturing mechanical hardwood and, to some extent, softwood pulps has been further developed [3, 4]. In the alkaline peroxide mechanical pulping (APMP) process, the wood chips are impregnated in one or two steps with chelating agents and bleaching . Hyposulphite is a typical reduction bleaching agent. At the beginning of s, 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.

    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.   Bleaching chemical pulps. Chemical pulps, such as those from the kraft process or sulfite pulping, contain much less lignin than mechanical pulps, (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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Bleaching technology for chemical and mechanical pulps Download PDF EPUB FB2

Get this from a library. Bleaching technology for chemical and mechanical pulps. [Ken L Patrick;]. Each class of fiber requires a somewhat different bleaching treatment with recycled and mechanical fibers requiring somewhat similar bleaching methods.

Elemental chlorine free kraft type chemical pulps are the most common type of chemical pulp produced even though these pulps are relatively difficult to bleach. 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. Pulp fibers currently produced from the pulp and paper industry can be classified into three different kinds: chemical pulps, mechanical pulps, and deinked (recycled) pulps. The principle objective of bleaching any type of pulp is usually to increase the pulp brightness, which is defined as reflectance measured at a wavelength of nm.

Because lignin is removed in chemical pulp bleaching, the brightness of chemical pulps tends to be much more stable than mechanical pulps.

Brightening is also done for recycled fibers. MECHANICAL PULP BLEACHING Dr. THOMAS Q. HU FPInnovations – Pulp and Paper Division Wesbrook Mall, Vancouver, BC V6S 2L9 Tel.:   This technology can be combined with various types of kraft pulping processes and bleaching sequences.

The aims of the enzymatic treatment depend on the actual mill conditions, and may be related to environmental demands, reduction of chemical costs, or maintenance or even improvement of product quality. Bleaching Mechanical Pulps. Production of high brightness mechanical pulps requires consideration of the entire process including: selection of the wood source, in-process storage of the wood, the pulping process, and pulp bleaching, as well as the intended use of the product.

Light-colored woods without fungal discoloration or dark-colored. Teaching and course development in pulp and paper technology and wood chemistry. Leading research and development programs into: Energy savings in mechanical pulping processes, genetic control of fiber properties. New products from woody biomass, color and brightening of mechanical pulps and enzymatic treatment of paper machine process waters.

Globally, 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.

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.

In the first phase, the effect of different NaOH to H2O2 ratios on bleaching chemi-mechanical pulp (CMP) was investigated.

The pH of unbleached pulp was and its brightness and freeness were. This article provides highlights of current and emerging technologies for bleaching (chemi)mechanical and chemical pulps.

Bleaching of (chemi)mechanical pulps. Sodium hydrosulfite is the bleaching agent of choice for (chemi)mechanical pulps when a moderate (4. Volume 2 focuses on creating an understanding of the chemical and technical processes involved in the production of pulp.

The work treats. wood handling, i.e. barking, chipping, storage and screening processes, chemistry and technology during mechanical and chemical pulp production, including pulping and bleaching chemistry and technology.

Mechanical pulps retain most of the lignin, cellulose and hemicellulose present in the wood used to make the pulps. It would be impractical to remove this much lignin by bleaching, and undesirable since one of the big advantages of mechanical pulp is the high yield of pulp based on the wood used.

Previous Pulp Bleaching Books Current Pulp Bleaching Book Organization of the Current Book References Cited Chapter 2. Oxygen Delignification Andritz Bleaching Technology for Chemical and Mechanical Pulps Chemical pulp bleaching Background Chemical pulp bleaching sequences MC equipment in.

Mechanical Pulp Bleaching (Brightening) With Hydrogen Peroxide, Pulping Conference Proceedings. center) and FCBA (French Institute of Technology for forest-based and furniture sectors) for increasing the forces in plant chemistry.

The addressed Markets (chemical and mechanical pulps) Panels (MDF, insulation, particles, in chemical pulp bleaching book chapters reduction in formaldehyde emission in panels with biosourced adhesives 30 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, a).Mechanical pulping relies more so on mechanical actions to separate and develop wood fibers, rather than using chemical means.

Pulp is a lignocellulosic fibrous material prepared by chemically or mechanically separating cellulose fibers from wood, fiber crops, waste paper, or with water and other chemical or plant-based additives, pulp is the major raw material used in papermaking and.

Chemical and Mechanical Pulp Online Course Description: This individual module was developed by Coastal Alabama Community College under a grant by the National Science Foundation.

Learning Objectives: • Increase knowledge of the differences between chemical pulp and mechanical .(English) In: Nordic Pulp & Paper Research Journal, ISSNE-ISSNVol. 25, no 3, p. Article in journal (Refereed) Published Abstract [en] Hydrogen peroxide is a widely used bleaching chemical for mechanical pulps and is particularly useful when high .Abstract.

During sequential bleaching operations, pulp fiber properties are gradually changed due to mechanical and chemical treatments. In this study, the correlations between pulp or fiber properties such as kappa number, viscosity, total charge, fiber length, and zero-span tensile strength as well as Scott bond of elemental chlorine free (ECF) bleached softwood kraft pulps was investigated.