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LGP2 - Simultaneous production of bleached cellulose fibers and polyxylosides alkyl through a biorefinery paper

Published on February 11, 2013
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January 11, 2013

Marion Sanglard defended her PhD thesis from the University of Grenoble entitled "Simultaneous production of bleached cellulose fibers and polyxylosides alkyl through a biorefinery paper".

Laboratory of Pulp and Paper Science and Graphic Arts  (LGP2)This thesis was prepared at the Laboratory of Pulp and Paper Science and Graphic Arts (LGP2) under the supervision of Christine Chirat, Associate Professor, and Professor Dominique Lachenal, from Grenoble INP-Pagora.

This project aims at converting a Kraft pulp mill into a biorefinery by removing hemicelluloses from Hardwood in order to convert them into surface-active agents, namely alkylpolyxylosides, while high quality bleached pulps must still be obtained.

Industrial Eucalyptus globulus woodchips were submitted to different autohydrolysis conditions so as to extract a substantial amount of hemicelluloses, composed mainly of xylose. The prehydrolysis liquors were purified with activated charcoal and concentrated. Then the extracted saccharides were successfully used to synthesise alkylpolyglycosides. These surfactants have a saccharide as their hydrophilic part, while their lipophilic part is a fatty alcohol. Moreover, the impact on the glycosylation reaction of the saccharides' concentration and of the other species found in the prehydrolysates was studied.

In parallel, the pretreated woodchips were much easier to delignify using Kraft cooking than the control ones. This allowed the use of soda-anthraquinone cooking at reduced alcali and temperature. The resulting pulps had lower lignin and hexenuronic acid content than the pulps from untreated wood, with higher DPv and brightness. The pulps from prehydrolysed wood reacted as well as the control pulps to oxygen delignification. All pulps were fully bleached to a 90% ISO brightness through an ODEPD sequence.

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Date of update February 11, 2013

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes