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You are here: Home > Technique > Processes > Scientific report of the LGP2 > Chemical processes > Introduction           : January 8th 2007
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Researchers of the LGP2 (EFPG, INPG, CNRS, CTP)
(November 2006)
Documents taken from the
"Scientific Report of the Laboratory of Pulp and Paper Science and Graphic Arts - UMR 5518
Grenoble - France
January 2002-November 2005"

II - Chemical processes

II - 1 - Introduction

The manufacture of cellulosic fibres from lignocellulosics material is a sophisticated chemical process. The objective is to remove lignin with chemicals which do not affect cellulose severely. The fact that these two components are intimately mixed inside the fibre walls makes this operation particularly difficult. A mixture of sodium hydroxide and sodium sulphide is generally, applied under drastic conditions (160 – 170°C). Lignin is then depolymerised by cleavage of interunit alkyl – aryl ether bonds. However, the carbohydrate fraction (hemicellulose, cellulose) is also partly hydrolysed by the alkaline medium.80 % of the hemicellulose are lost. Cellulose depolymerisation occurs too, but can be limited at a level which does not impair the fibre properties.

The two problems on which most of the research effort of the Chemical processes team is focussed are:

The topics under investigation in our team are the following:

The main partners in these studies are the French Agency for Environment and Energy (ADEME), CTP, ATOCHEM, AIR LIQUIDE and DEGREMONT.
Cooperation with foreign companies and institutes is also very active in the frame work of European Projects (FAIR and Quality of life).

The two main areas of research investigated these last three years are shortly presented below.

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