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You are here: Home > Technique > Processes > Scientific report of the LGP2 > Chemical processes > Introduction           Update: July 20, 2011
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Researchers of the LGP2
(May 2011)
 
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Laboratory of Pulp and Paper Science and Graphic Arts

II - Chemical Processes

II - 1 - Introduction

The manufacture of cellulosic fibres from lignocellulosics material is a complex and 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 (hemicelluloses, cellulose) is also partly hydrolysed by the alkaline medium. About 80 % of the hemicelluloses are lost. Cellulose depolymerisation occurs too, but can be limited at a level which does not impair the fibre properties.

The problems on which most of the research effort of the Chemical Processes department is focused are:

The more relevant topics under investigation in our team are the following:

The main partners in these studies are the French Environment and Energy Management Agency (ADEME), The French National Research Agency (ANR), le Centre Technique du Papier (CTP), the Institut Technologique Forêt Cellulose Bois-construction Ameublement (FCBA), Arkema, Air Liquide, EDF, Tembec, Degrémont, Wedeco. Cooperation with foreign companies and institutes is also very active in the frame work of European Projects.

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

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