bleaching of wood pulp wikipedia the free
How Pulp Bleaching Works Mixer Direct Blog
How Pulp Bleaching Works Today To understand how pulp bleaching works, we should first note its place in the overall pulp and paper making process. Pulp bleaching is meant to remove lignin, a natural element that causes paper to brown, from the wood pulp, thus brightening it.
ELEMENTAL CHLORINEFREE BLEACHING OF SODA .
lack of wood. With respect to the lower bleaching efficiency of pulps from annual plants because of anatomical and chemical characteristics,19 as well as the relatively high ash content, 20 totally chlorinefree bleaching procedures do not confer an adequate brightness level to this type of pulp. 21 Therefore, elementary chlorinefree bleaching
Bleaching of wood pulp Wikidata
Bleaching of wood pulp (Q) From Wikidata. Jump to navigation Jump to search. No description defined. edit. Language Label Description Also known as; English: Bleaching of wood pulp. No description defined. Statements . Sitelinks. Wikipedia (5 entries) edit. enwiki Bleaching of wood pulp; frwiki Blanchiment (papier) hrwiki Bijeljenje ...
Application of peroxymonosulfuric acid as a modification ...
In this study, the application of peroxymonosulfuric acid (H2SO5: Psa) to TCF bleaching was proposed as a modification of the bleaching process of hardwood prehydrolysiskraft pulp.
bleaching wood | Bleaching of wood pulp Wikipedia
Bleaching of wood pulp is the chemical processing of wood pulp to lighten its color and whiten the pulp. The primary product of wood pulp is paper, for which whiteness (similar to, but distinct from brightness) is an important characteristic.
Minimizing Viscosity Loss during Totally ChlorineFree ...
(2013). "Viscosity loss: TFC bleaching," BioResources 8(1), 238249. 238 Minimizing Viscosity Loss during Totally ChlorineFree Bleaching of Hardwood Kraft Pulp Frédéric Pouyet,* Dominique Lachenal, Satyajit Das, and Christine Chirat By applying increasing amounts of ozone (Z stage bleaching.
BLEACHING OF SOFTWOOD KRAFT PULP WITH OXYGEN .
Oxygen and peroxide are widely used today in pulp bleaching, in elementally chlorine free (ECF) and totally chlorine free (TCF) sequences. Over the last decades, oxygen delignification has been the most important way of lignin removal before the subsequent pulp bleaching.
MODELING CHLORINE DIOXIDE BLEACHING OF CHEMICAL .
Chlorine dioxide (ClO2) is the primary bleaching agent applied in modern chemical pulp bleaching processes. Elemental ChlorineFree (ECF) pulp, produced using chlorine dioxide as the primary bleaching agent, had a nearly 85% world market share in 2005 (Anon. 2006). This number is likely to have increased during the past five years.
Wood pulp Revolvy
Elemental chlorine free (ECF) is a technique that uses chlorine dioxide for the bleaching of wood pulp . It does not use elemental chlorine gas during the bleaching process and prevents the formation of dioxins and dioxinlike compounds, carcinogens .
Bleach
Chlorine dioxide is used for the bleaching of wood pulp, fats and oils, cellulose, flour, textiles, beeswax, skin and in a number of other industries. In the food industry, some organic peroxides (benzoyl peroxide, etc.) and other agents ( bromates) are used as flour bleaching and maturing agents.
Blankigado de lignopulpo Wikipedia's Bleaching of wood ...
"Kraft pulp bleaching using dimethyldioxirane: stability of the oxidants". Can. J. Chem. 74 (2): 232237. doi:/v96026. Retrieved . ^ Springer, (December 1997). "Delignification of Wood and Kraft Pulp with Peroxymonophosphoric Acid". Journal of Pulp and Paper Science. 23 (12): 582584.
Paper Simple English Wikipedia, the free encyclopedia
Modern paper is a thin material of (mostly) wood fibres pressed together. People write on paper, and books are made of paper. Paper can absorb liquids such as water, so people can clean things with paper.. The pulp and paper industry comprises companies that use wood as raw material and produce pulp, paper, board and other cellulosebased products.
Process for bleaching mechanical wood pulp with sodium ...
Jul 14, 1992· bleaching said pulp in said bleaching tower with more of said alkaline bleach liquor, wherein the total amount of sodium hydrosulfite added is not more than about 2% by weight of sodium hydrosulfite, based on the total weight of pulp and wood chips is added, and whereby the bleaching produces a brightness gain of at least about 10 to 13 ISO points in the refiners.
Application of peroxymonosulfuric acid as a ... SpringerLink
Abstract. The totally chlorinefree (TCF) bleaching process avoids the generation of organochlorine substances. In this study, the application of peroxymonosulfuric acid (H 2 SO 5: P sa) to TCF bleaching was proposed as a modification of the bleaching process of hardwood prehydrolysiskraft pulp. Acacia mearnsii pulps were treated by oxygen bleaching, followed by P sa treatment, ozone ...
Lecture 26: Preparation of wood pulp by sulfate (kraft ...
Lecture 26: Preparation of wood pulp by sulfate (kraft) process What is pulp? Pulp is a commercial fibrous material obtained from bamboo, wood, bagasse (waste material) etc. by mechanical and chemical means. Pulping means disintegration of bulky fibrous material to small fibres.
New technologies for the fractionation of wood to produce ...
A program of targeted fundamental and applied research is in progress to develop new technology for the separation of cellulosic fibers from wood, and for bleaching them. The program is based on use of regenerable oxidant developed at FPL. These technologies promise significant reduction of the environmental impact of pulp and paper mills.
BLEACHING OF WOOD PULP WITH DITHIONITE SOLUTION STABILIZED ...
Apr 04, 1972· The series of experiments given in Table 1 apply to the bleaching of wood pulp having a consistency of 2 percent at 60° C., a pH value of and a period of 1 hour with a concentration of bleaching agent of to percent with reference to the dry solids.
