Eucalyptus globulus kraft process modifications: Effect on pulping and bleaching performance and papermaking properties of bleached pulps
authors Santiago, AS; Pascoal, C
nationality International
journal JOURNAL OF CHEMICAL TECHNOLOGY AND BIOTECHNOLOGY
author keywords Eucalyptus globulus; kraft pulping; anthraquinone; effective alkali splitting; ECF bleaching; papermaking properties
keywords YIELD; DELIGNIFICATION; BLEACHABILITY; WOOD; ANTHRAQUINONE; LABILL; LIGNIN
abstract BACKGROUND: Increasing the yield of the wood pulping process allows the reduction of specific wood costs. Process modifications with a great impact on pulp yield are the profiling of chemical charges and addition of anthraquinone (AQ). The aim of the present work is to investigate the influence of effective alkali (EA) profiling and addition of anthraquinone on E. globulus kraft pulping performance. The impact of such process modifications on the ECF bleaching process and on the papermaking properties of the resulting bleached pulps is also evaluated. RESULTS: An EA profiling cook may lead to a pulp yield gain, which is more significant as the total EA charge used in the kraft cook increases. AQ addition to kraft pulping leads to a significant yield increase. The ClO2 charge required to fully bleach the pulps is lower for EA profiling and higher for kraft + AQ unbleached pulps. Bleached AQ pulp presents a high beatability due to high pulp xylan retention. CONCLUSION: A low total EA charge is the key parameter for high polysaccharide retention on pulp. AQ addition constitutes a feasible strategy to increase pulp yield. Bleaching performance and papermaking properties of pulps produced with the three different methods may be affected by the kraft pulping modifications. (C) 2008 Society of Chemical Industry.
publisher JOHN WILEY & SONS LTD
issn 0268-2575
year published 2008
volume 83
issue 9
beginning page 1298
ending page 1305
digital object identifier (doi) 10.1002/jctb.1947
web of science category Biotechnology & Applied Microbiology; Chemistry, Multidisciplinary; Engineering, Environmental; Engineering, Chemical
subject category Biotechnology & Applied Microbiology; Chemistry; Engineering
unique article identifier WOS:000258632700016
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journal analysis (jcr 2019):
journal impact factor 2.75
5 year journal impact factor 2.857
category normalized journal impact factor percentile 53.374
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