2 edition of bleaching of pulp found in the catalog.
bleaching of pulp
Technical Association of the Pulp and Paper Industry
1953 in New York .
Written in English
|Series||Its TAPPI monograph series -- no. 10|
|LC Classifications||TS1176 T4|
|The Physical Object|
|Number of Pages||364|
Metal ions, particularly manganese catalyze the decomposition of hydrogen peroxide, so some improvement in the efficiency of bleaching of pulp book bleaching can be achieved if the metal levels are controlled. As the beating proceeds, the revolving roll is gradually lowered until it is riding full weight on the fibres between it and the bedplate. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching. Lower pH solutions are more effective at removing transition metals, but also remove more of the beneficial metal ions, especially magnesium  Other bleaching agents A variety of more exotic bleaching agents have been used on chemical pulps. Conventional bleaching using elemental chlorine produces and releases into the environment large amounts of chlorinated organic compoundsincluding chlorinated dioxins.
The ban of chlorine from bleaching pulp has shifted bleaching to environmentally sound procedures. A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing. Industrial Chemistry Back cover copy In this two volume set, Dr. Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods. Conventional bleaching using elemental chlorine produces and releases into the environment large amounts of chlorinated organic compoundsincluding chlorinated dioxins.
List of Abbreviations. There are a number of related hybrid pulping methods that use a combination of chemical and thermal bleaching of pulp book to begin an abbreviated chemical pulping process, followed immediately by a mechanical treatment to separate the fibres. As one of several oxides of chlorine, it is a potent and useful oxidizing agent used in water treatment and in bleaching. Volume 1. Transition metal compounds, particularly those of ironmanganese and copperwhich have multiple oxidation states, facilitate many radical reactions and impact oxygen delignification. The brightness of paper and other materials is determined by special reflection meters containing photoelectric cells that measure the amount of light of selected wavelength reflected by the surface.
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Another pigment is titanium dioxide TiO2prepared from the minerals rutile and anatase.
This simple bleaching treatment, however, is not practical for kraft that is difficult to bleach, nor can it retain maximum pulp strength. Ozone reacts with the carbon carbon double bonds in lignin, including those within aromatic rings. Chlorine dioxide[ edit ] Chlorine dioxideBleaching of pulp book is an unstable gas with moderate solubility in water.
Paper chemicals designate a group of chemicals that are bleaching of pulp book for paper manufacturing, or modify the properties of paper. Freshly prepared pure magnesium oxide is considered to be on the brightness scale.
In the s ozone was touted as good reagent to allow pulp to be bleached without any chlorine-containing chemicals totally chlorine-free, TCF. The roll is capable of being set very accurately with respect to the bedplate, for the progressive adjustment of the roll position is the key to good beating.
The axially oriented blades are mounted on a conically shaped rotor that is surrounded by a stationary bladed element stator. Part I: Chemical Pulping. The bleaching of pulp book was invented by Theodor Kleinert in as an environmentally benign alternative to kraft pulping.
Pulp can be manufactured using mechanical, semi-chemical or fully chemical methods kraft and sulfite processes. As the beating proceeds, the revolving roll is gradually lowered until it is riding full weight on the fibres between it and the bedplate.
Lower pH solutions are more effective at removing transition metals, but also remove more of the beneficial metal ions, especially magnesium  Other bleaching agents[ edit ] A variety of more exotic bleaching agents have been used on chemical pulps.
Over twenty-five pulp mills worldwide have installed equipment to generate and use ozone. The presence of organic matter can make them less effective as disinfectants.
The competing chemical pulping process, the sulfate, or kraftprocess, was developed by Carl F. This bond is fairly weak and is often broken in chemical reactions of peroxides, giving rise to very reactive oxygen species, which are the active agents of the bleach.
The target of this book is to explain the potential and the limitations of different chemicals and to demonstrate the necessity of comprehensive solutions for an environmentally sound use of the raw material wood, of chemicals, and of water in the production of pulp with top quality and yield.
After formation and drying of the sheet, the resins change to an insoluble form, creating water-resistant bonds between fibres. Magnesium salts are added to oxygen delignification to help preserve the cellulose chains,  but mechanism of this protection has not been confirmed Hydrogen peroxide Using hydrogen peroxide to delignify chemical pulp requires more vigorous conditions than for brightening mechanical pulp.
The chemistry is very similar to that involved in oxygen delignification, in terms of the radical species involved and the products produced. An increased public awareness of environmental issues from the s and s, as evidenced by the formation of organizations like Greenpeaceinfluenced the pulping industry and governments to address the release of these materials into the environment.
It is a strong base. Emphasis is placed on applicable bleaching, in clear contrast to sophisticated, complicated or simply expensive pseudo modern bleaching. A typical pulper has a capacity of kilograms 2, pounds of fibre in 6 percent solution and requires horsepower to drive it.
Technology has made it easy to process these raw materials in an economic and lucrative way to meet the global demand.
Bleaching and washing The use of calcium and sodium hypochlorites to bleach paper stock dates from the beginning of the 19th century. The finished product may be either bleached or non-bleached, depending on the customer requirements.
The potential of different bleaching chemicals is exemplified in detail with a special focus on what to do and what to avoid.
Adequate amount of raw materials bleaching of pulp book processing paper and pulp is available. To increase the dry strength of paper, the materials most commonly used are starch, polyacrylamide resins, and natural gums such as locust bean gum and guar gum.
The so-called basic dyes have a high affinity for groundwood and unbleached pulps. Herbert Sixta, head of the cellulose and viscose research department at Lenzing AG in Austria, has brought together a team of authors to produce the first comprehensive handbook on the market.
It bleaching of pulp book an important role in commercial field as well as in academic field also.Biermann s Handbook of Pulp and Paper Book Summary: Biermann's Handbook of Pulp and Paper: Raw Material and Pulp Bleaching of pulp book, Third Edition is a comprehensive reference for industry and academia covering the entire gamut of pulping technology.
This book provides a thorough introduction to the entire technology of pulp manufacture; features chapters covering all aspects of pulping from wood. point brightness increase when bleaching a northern hardwood kraft pulp (species unspecified) with weight percent KHSO 5 (as "Oxone") on ovendry pulp at 10% consistency, pH 11, and 50°C for 3 h.
Bleaching conditions were probably not optimized, and it seemed likely that better results might be. Designed as a textbook and reference book, Pulp Bleaching: Principles and Practice explains what bleaching is, why pulp is bleached, and how bleaching is done.
The book also features discussions on several "hot topics" in pulp bleaching, including elemental chlorine free bleaching, totally chlorine free bleaching, enzyme assisted bleaching, and bleaching of recycled fiber.point brightness increase when bleaching a northern pdf kraft pulp (species unspecified) with weight percent KHSO 5 (as "Oxone") on ovendry pulp at 10% consistency, pH 11, and 50°C for 3 h.
Bleaching conditions were probably not optimized, and it seemed likely that better results might be .Mar 26, · What is bleaching download pdf pulp. Posted on March 26, by admin. The objective of pulp bleaching is to produce white pulp. Unbleached pulps are not suitable for manufacturing of high grade of white paper.
Since all the processing pulp brightness is very low, especially Kraft pulp. The sulfite pulping process produces comparatively bright chemical.Mar 17, · Alongside the traditional ebook of pulping processes, pulp used in industry and paper pulps, this book describes all pulping processes used for paper and board manufacturing as well as waste liquor treatment, pulp bleaching and environmental aspects, while also covering pulp properties and tjarrodbonta.com: Herbert Sixta.