Bleaching of eucalypt pulps studied by carbon-13 N.M.R. spectroscopy

Cross polarization, magic-angle spinning, interrupted decoupling and paramagnetic doping techniques have been combined to provide the sensitivity needed for detection of chemical functional groups involved in pulp bleaching reactions. Cold soda pulp and stone groundwood pulp were bleached by calcium...

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Bibliographic Details
Published inJournal of wood chemistry and technology Vol. 11
Main Authors Dunn L.A, Newman R, Hemmingson J.A
Format Journal Article
LanguageEnglish
Published 01.03.1991
Subjects
alkali treatment
blanchissement
blanqueadura
bleaching
espectrometria
espectroscopia rmn
eucalyptus
hydrogen peroxide
nmr spectroscopy
pasta
pate cellulosique
peroxido de hidrogeno
peroxyde d' hydrogene
pulp
spectrometrie
spectrometry
spectroscopie rmn
traitement aux alcalis
tratamiento alcalino
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Summary:Cross polarization, magic-angle spinning, interrupted decoupling and paramagnetic doping techniques have been combined to provide the sensitivity needed for detection of chemical functional groups involved in pulp bleaching reactions. Cold soda pulp and stone groundwood pulp were bleached by calcium hypochlorite and hydrogen peroxide respectively. These treatments had little effect on ketonic structures and no effect on etherified aryl units, but hypochlorite degraded most lignin units not linked in beta-0-4 ethers. This work provides direct confirmation of published predictions based on bleaching of model compounds in solution.
Bibliography:K50
K
ISSN:0277-3813
1532-2319
DOI:10.1080/02773819108050263