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Title
Improved oxygen delignification selectivity towards oil palm (Elaeis guineensis) EFB Soda-AQ pulp: Effect of photo pretreatment and AQ-aided H2O2 reinforcement
Authors
YIN HUI CHONG SOO HUEY NG and CHEU PENG LEH
Received
March 2, 2012
Published
Volume 47 Issue 3-4 March-April
Keywords
peroxide reinforced oxygen delignification, anthraquinone, oil palm EFB, pulp viscosity, photopretreatment
Abstract
The kappa number (Kn) reduction of oil palm empty fruit bunch (EFB) soda-anthraquinone (AQ) pulp by oxygen
delignification was limited to only 34% to avoid substantial cellulose degradation. Thus, a preliminary study of
photo-pretreatment was performed to improve the bleaching selectivity, and its effect was compared with the AQaided H2O2 reinforced O-stage (Op-stage). The results showed that both methods performed better selectivity than
the ordinary O-stage. It was suggested that the photo-treatment improved selectivity by diminishing carbonylinduced carbohydrate degradation. Conversely, the AQ-aided Op-stage delivered higher delignifying power with
minimum cellulose degradation. For pulps with the Kn above 6.0, the effectiveness of both methods was about the
same, but to achieve lower Kn (5.8 and below), the AQ aided Op pulps exhibited better selectivity.
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