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Efficient total halogen-free photochemical bleaching of kraft pulps using alkaline hydrogen peroxide

Paper ID Volume ID Publish Year Pages File Format Full-Text
29013 44112 2008 8 PDF Available
Title
Efficient total halogen-free photochemical bleaching of kraft pulps using alkaline hydrogen peroxide
Abstract

Total halogen-free bleaching of kraft pulps was conducted by an oxidative photochemical process at room temperature using alkaline hydrogen peroxide. Selection of an appropriate wavelength of light was crucial for effective bleaching and avoiding degradation of cellulose. The wavelength of the light has to be selected so that the light is absorbed only by the colored compounds in the pulps and not by the bleaching reagents or the pulp itself. When a long-wavelength black-light fluorescent lamp was used in combination with aqueous hydrogen peroxide solution at pH 11, the bleaching efficiency for hardwood and softwood kraft pulps reached the same level as that obtained by conventional two-stage elemental chlorine-free processes.

Keywords
Kraft pulp; Photochemical bleaching; Total halogen-free process; Oxidative process; Alkaline hydrogen peroxide
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Efficient total halogen-free photochemical bleaching of kraft pulps using alkaline hydrogen peroxide
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 200, Issues 2–3, 15 December 2008, Pages 388–395
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us