The chemistry of acid catalyzed delignification of sugarcane bagasse in the ionic liquid trihexyl tetradecyl phosphonium chloride


Autoria(s): Keskar, S. S.; Edye, L. A.; Doherty, W. O. S.; Bartley, J. P.
Data(s)

2012

Resumo

This article reports on the cleavage of lignin ß-aryl ether bonds in sugarcane bagasse by the ionic liquid (IL) trihexyl tetradecyl phosphonium chloride [P66614] Cl, in the presence of catalytic amounts of mineral acid fca. 0.4%). The deligniflcation process of bagasse was studied over a range of temperatures (120°C to 150°C) by monitoring the production of ß-ketones (indicative of cleavage of ß-aryl ethers) using FTIR spectroscopy and by compositional analysis of the undissolved fractions. Maximum deligniflcation was obtained at 150°C, with 52% of lignin removed from the original lignin content of bagasse. No deligniflcation was observed in the absence of acid, which suggests that the reaction is acid catalyzed with the IL solubilizing the lignin fragments. The rate of deligniflcation was significantly higher at 150°C, suggesting that crossing the glass transition temperature of lignin effects greater freedom of rotation about the propanoid carbon-carbon bonds and leads to increased cleavage of ß-aryl ethers. An attempt has been made to propose a probable mechanism of deligniflcation of bagasse with the phosphonuim IL. © Taylor & Francis Group, LLC.

Identificador

http://eprints.qut.edu.au/51505/

Publicador

Taylor & Francis Group, LLC

Relação

DOI:10.1080/02773813.2011.573120

Keskar, S. S., Edye, L. A., Doherty, W. O. S., & Bartley, J. P. (2012) The chemistry of acid catalyzed delignification of sugarcane bagasse in the ionic liquid trihexyl tetradecyl phosphonium chloride. Journal of Wood Chemistry and Technology, 32(1), pp. 71-81.

Direitos

Copyright 2012 Taylor & Francis

Fonte

School of Chemistry, Physics & Mechanical Engineering; Science & Engineering Faculty

Palavras-Chave #Bagasse #Deligniflcation #FTIR #Ionic liquids (ils) #Tetraalkyl phosphonium salts
Tipo

Journal Article