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Conversion of bleached Kraft pulp into dissolving pulp and microfibrillated cellulose

Published on June 2, 2022
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PhD Defense May 19, 2022

Andrea Estefania Vera Loor, PhD student at LGP2, defended her thesis: "Novel use of hydrogen peroxide to convert bleached Kraft pulp into dissolving pulp and microfibrillated cellulose".

This doctoral thesis was prepared at the Université Grenoble Alpes under the direction of Nathalie Marlin, HDR Lecturer, and the co-supervision of Professor Gérard Mortha (Grenoble INP-Pagora/ LGP2).

Andrea Estefania Vera Loor has presented her research results entitled Novel use of hydrogen peroxide to convert bleached Kraft pulp into dissolving pulp and microfibrillated cellulose.

The present study investigated the conversion of bleached Kraft pulp into dissolving pulp and microfibrillated cellulose using three oxidative treatments:
(1) the activation of hydrogen peroxide by copper species for the production of hydroxyl radicals;
(2) the combination of caustic extraction with hydrogen peroxide to remove hemicelluloses and to oxidize cellulose; and
(3) the oxidation by sodium periodate followed by hydrogen peroxide oxidation to enrich the pulp with carboxyl groups.

Dissolving pulps properties were hardly reached, but the treatments (1) and (3) enabled to produce interesting microfibrillated cellulose with reduced energy consumption.

Moreover, to evaluate the dissolution behavior, a derivatization method using cellulose tricarbanilation was developed. This simple method, based on particle size measurement by DLS, allows to discriminate cellulosic samples.
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Date of update June 2, 2022

Université Grenoble Alpes