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Esterification of organosolv lignin under supercritical conditions

Cachet, Nadja and Camy, Séverine and Benjelloun-Mlayah, Bouchra and Condoret, Jean-Stéphane and Delmas, Michel Esterification of organosolv lignin under supercritical conditions. (2014) Industrial Crops and Products, 58. 287-297. ISSN 0926-6690

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Official URL: https://doi.org/10.1016/j.indcrop.2014.03.039


An organosolv lignin, extracted in organic acid media, named Biolignin™, was acetylated with acetic anhydride in supercritical carbon dioxide (scCO2). The effect of moisture and specific surface of lignin sample, temperature (50, 80, 100, 150 °C), reaction time and the use of a catalyst have been studied using analytical techniques such as FT-IR, quantitative 31P NMR and Differential Scanning Calorimetry (DSC). The reaction appeared to be more efficient when a dried organosolv lignin was used (97% Dry Matter) and with a specific surface of 0.645 m2/g. The highest degree of substitution of acetylated samples was obtained after 1 h of reaction at a temperature of 100 °C (180 bar) and in the presence of pyridine as a catalyst. When compared with conventionally acetylated lignin (using a solvent medium), it appeared that supercritical conditions allowed a higher yield of acetylation and a decrease of the glass transition temperature of the lignin.

Item Type:Article
HAL Id:hal-01886017
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > Compagnie Industrielle de la Matière Végétale - CIMV (FRANCE)
Laboratory name:
Deposited On:02 Oct 2018 12:58

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