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LGP2 - New conditions of use of ozone for cellulosic pulp bleaching - Development of a green bleaching sequence

Published on April 14, 2014
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PhD Defense March 21, 2014

Frédéric Pouyet defended his University of Grenoble Ph.D. thesis entitled "New conditions of use of ozone for cellulosic pulp bleaching - Development of a green bleaching sequence".

Laboratoire Génie des Procédés Papetiers (LGP2)This thesis was prepared at the LGP2 laboratory under the supervision of Dominique Lachenal, Professor, et de Christine Chirat, Associate Professor, at Grenoble INP-Pagora.

In order to obtain white paper, the brown kraft pulp obtained from wood after a chemical treatment has to be bleached. Several chemical reagents can be used, including the efficient chlorinated agents. However, the use of those chlorinated agents leads to the generation of toxic compounds, among other issues. Other reagents such as ozone and peroxide can be used to partially or fully replace them, but the way they react with pulp components was not fully understood and they seemed to inevitably lead to a degradation of the end product.

The aim of this thesis was to design a greener bleaching sequence, giving high quality pulps without the use of chlorinated reagents.  This was achieved thanks to a better understanding of the chemical reactions involved in the bleaching of pulp, and more specifically through a better apprehension of the possible reactions of ozone.

In October 2012, the Eucalyptus Award from Brazilian Technical Association of producers of pulp and paper (ABTCP) awarded the conference presentation of the first results of his research.

See also
The Eucalyptus Award, a Brazilian distinction, awarded to a LGP2 PhD student

Press release
Ph.D. thesis of LGP2 (2014)

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Date of update April 14, 2014

Grenoble INP Institut d'ingénierie Univ. Grenoble Alpes