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The effect of wood extractives on pulp properties of maritime pine kraft pulp

Authors: Baptista, Cecília; Belgacem, Mohamed Naceur; Duarte, Ana Paula;

The effect of wood extractives on pulp properties of maritime pine kraft pulp

Abstract

The effect of wood extractives on pulp properties, namely the colour of the unbleached pulp and its bleaching aptitude, was evaluated by carrying out kraft cookings after extractive removal of the Pinus pinaster wood. The colour of the pulps thus obtained was compared to a reference pulp prepared without any wood extraction. Two types of wood extraction were realised. The first one consisted on using different non-swelling and swelling solvents allying upon 8 different extractions, whereas the second one was an alkaline pre-treatment of the wood chips. For the first set of extractions, acetone and ethanol-toluene appeared to be the most efficient, since the pulps obtained from wood previously extracted by these solvents showed an increase in the reflectance factor by up to 7,5% and a decrease in the kappa number of about 4 points. For the second type of pre-treatment, the results obtained showed improvements of 10% in the reflectance factor of unbleached pulp and about 12% in the kappa number. The influence of the extractives on the pulp bleachability was studied by submitting the most promising samples to a DE bleaching sequence. These pulps showed increments in the reflectance factor more than 30% higher when compared with the reference.

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Portugal
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Keywords

Organic solvents, Alkaline extraction, Kraft pulp, Maritime pine, Kappa number, Reflectance factor, Bleachability

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
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