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An efficient photochemical bleaching of kraft pulps using total halogen-free reducing reagents

Paper ID Volume ID Publish Year Pages File Format Full-Text
27767 44042 2008 7 PDF Available
Title
An efficient photochemical bleaching of kraft pulps using total halogen-free reducing reagents
Abstract

Total chlorine-free bleaching of kraft pulps was conducted by a reductive photochemical process at room temperature. Reducing reagents were screened, and bleaching conditions were optimized using excimer lasers. The laser used in the best bleaching condition was then substituted by conventional light sources to make the process more easily accessible. The most favorable condition for the bleaching of kraft pulps was irradiation with a low-pressure mercury lamp in the presence of aqueous sodium borohydride solution, which gave bleaching efficiency and the properties of pulps similar to those obtained by a conventional two-stage, elemental chlorine-free process. The photochemical background of the bleaching is discussed.

Keywords
Photochemical decomposition; Decolorization; Lignin; Kraft pulp; Total halogen-free reductive bleaching
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An efficient photochemical bleaching of kraft pulps using total halogen-free reducing reagents
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 193, Issues 2–3, 25 January 2008, Pages 122–128
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