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                 New and effective supported catalysts for Kraft pulping.
Romain Perrier-Cornet, Frédérique Pichavant, Valérie Héroguez*
ENSCPB, LCPO, UMR5629, F-33407, Pessac, France


About 90% of chemical pulp (60% of market pulp) comes from Kraft pulping. This process
allows the degradation of lignin and hemicellulose that glue the cellulose fibers to each other
without seriously degrading the fibers. Nevertheless, selectivity of this process is not perfect
leading to low yield of fibers. One of the keys to improve yield pulping is to add
anthraquinone.
The current work, supported by wood industry, examines in detail the use of polymer beads
supporting immobilized anthraquinone for Kraft pulping. Such supported catalysts have to be
both stable during Kraft pulping and recyclable.       Various methods to produce polymer
particles usable for supported catalysts have been studied. These syntheses involve common
dispersed media polymerizations such as emulsion, dispersion or suspension. In this study we
took an interest in a less known dispersed media polymerization: the precipitation developed
by Stöver et al. This technique produces directly monodisperse crosslinked microspheres with
1-5µm diameter without any stabilizer or surfactant. This may be an advantage for pulping
application.
In this contribution we show how well-defined functionalized polymer beads carrying
anthraquinone entities at their periphery could be synthesized and advantageously used in
Kraft pulping of maritime pine.


Keywords: Pulping, maritime pine, anthraquinone, supported catalyst


Acknowledgment: This work was supported by Smurfit-Kappa, Dérivés Résiniques et
Terpéniques (DRT), Papéteries de Gascogne, Tembec and the “Ministère de l’Education
Nationale de l’Enseignement Supérieure et de la Recherche”.

				
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posted:4/2/2013
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