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First prize winner at Research Showcase in Asian Institute of Technology in School of Environment, Resources and Development
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Fig. 2. Mechanism of carbonium ion scavenging
ENHANCEMENT OF DELIGNIFICATION BY AROMATIC SCAVENGERS
Yakindra Prasad Timilsena1*, Nicolas Brosse2 & Sudip Kumar Rakshit3
1Asian Institute of Technology, Pathumthani 12120,Thailand (*for correspondence: [email protected])2Université de Lorraine, Laboratoire d’Etude et de Recherche sur le MAteriau Bois, Faculté des Sciences et Technologies, Bld des Aiguillettes, BP 70236, 54506 Vandoeuvre-lès-Nancy cedex, France3Lakehead University, Thunder Bay, Ontario Canada P7B 5E1
• Compare the effect of different aromatics on delignification ability of miscanthus.
• Aromatic compounds demonstrated significant enhancement in delignification ability of
miscanthus during two step pretreatment process.• Assessment of additional aromatics for their effect on delignification of more lignocellulosic feedstocks is
suggested for future work.
Five different kinds of aromatic compounds (naphthol, o-cresol, p-cresol, hydroquinone and dihydroxy-anthraquinone) were assessed for their effect on enhancement of organosolv delignification ability of miscanthus. The biomass was treated with each of the aromatic before autohydrolysis and the yield of ethanol organosolv lignin (EOL) and the Klason lignin content of the pulp after 2-step pretreatment were compared with the control and among the treatment. All the aromatics demonstrated a significant reduction in Klason lignin content of the pulp and increased EOL recovery as compared to the control- naphthol, p-cresol and dihydroxyanthraquinone having the equivalent effect.
Abstract
AIT RESEARCH SHOWCASE, May 2012
Objective
Methodology
Conclusion and Future Work
• Ethanol organosolv lignin (EOL) yield was significantly increased (13.3% in control whereas 23.4% in p-cresol treatment).• Klason lignin content of the resultant pulp after 2-step pretreatment was reduced significantly (14.9% in
control whereas 3.8% in p-cresol treatment).• ANOVA at 95% confidence level revealed significant
difference in control and treatments, however, the effect of p-cresol, naphthol and dihydroxyanthraquinone was equivalent• Path 2 in Fig. 2 shows the mechanism of scavenging the carbonium ions which resulted in enhanced delignification.
Results and discussion
10 g ODW Miscanthus
Mixed with 0.4 g aromatics and soaked in 100 mL acetone overnight
Acetone evaporation by air drying
Autohydrolysis (1500C, 8h, S/L=1:9)
OS delignification (1700C, 1h, SA=0.5%, S/L=1:8)
Filtration Liquid phase
PulpKL
EOL
Fig. 1. Effect of aromatics on delignification
Control Naphthol o-Cresol p-Cresol Hydroquinone DHAq0
5
10
15
20
25
13.3 20.8 16.8 23.4 17.8 2214.9 5.9 7.3 3.8 8.3 4.8
EOL yield (% )
KL (%)
Treatments
Yiel
d (%
)
The author is highly obliged to Prof. Sudip K. Rakshit and Prof. Nicolas Brosse for their invaluable advice during this study. Financial support from SDCC/AIT-France Network is highly appreciated.
SDCC / AIT – France Network
Path 0
