Etude de l'impact de l'extraction des hémicelluloses du bois sur les procédés d'obtention de cellulose et d'éthanol dans le cadre d'une bioraffinerie lignocellulosique

Abstract : Biofuel revival could be a great opportunity for the chemical pulp industry to widen the range ofits products made from wood. This thesis deals with the integration of a softwood hemicelluloseextraction step prior to the Kraft pulping process in order to produce both cellulose fibres andbioethanol.In this study the experimental work covers the entirety of the process: from the extraction ofmore than half of the hemicelluloses from wood either by autohydrolysis or dilute acid hydrolysis tothe production of bleached cellulosic fibres as well as ethanol from fermentated wood hydrolyzates.Prehydrolyzed wood and their subsequent pulps stood out by their excellent delignification abilityduring Kraft cooking and oxygen bleaching. Quantitative analysis of the main constituants of thepulps showed why prehydrolysis leads to decreased Kraft pulp yields (extra lignin loss andhemicelluloses loss including xylans). A range of hypotheses to explain the good delignificationability of prehydrolyzed wood Kraft pulps during oxygen bleaching was narrowed to one by Kraftlignin analysis.The overall results of the hemicellulose extraction prior to Kraft pulping as it has been defined inthis study showed that from 100 kg of softwood, 27 to 36 kg of bleached cellulosic fibres and 6litres of ethanol could be produced. The bleached cellulosic fibres are of great interest for dissolvingpulp or cellulose nanocrystals production.
Complete list of metadatas

Cited literature [84 references]  Display  Hide  Download

https://tel.archives-ouvertes.fr/tel-01683106
Contributor : Abes Star <>
Submitted on : Friday, January 12, 2018 - 6:06:07 PM
Last modification on : Friday, October 12, 2018 - 5:08:01 PM
Long-term archiving on : Monday, May 7, 2018 - 11:00:49 AM

File

BOIRON_2012_archivage.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-01683106, version 1

Collections

STAR | LGP2 | UGA

Citation

Lucie Boiron. Etude de l'impact de l'extraction des hémicelluloses du bois sur les procédés d'obtention de cellulose et d'éthanol dans le cadre d'une bioraffinerie lignocellulosique. Génie des procédés. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENI107⟩. ⟨tel-01683106⟩

Share

Metrics

Record views

2428

Files downloads

1897