Fundamental Understanding of Biomass Pretreatment Technologies: The Case of Ammonia Fiber Expansion (AFEX) Venkatesh Balan, Shishir Chundawat, Bryan Bals and Bruce Dale Biomass Conversion Research Laboratory, Department of Chemical Engineering and Material Science Michigan State University E. Lansing, MI 48824 http:\\www.everythingbiomass.org AICHE 2006, 17 th Nov 2006 San Francisco
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Fundamental Understanding of Biomass Pretreatment Technologies: The Case of Ammonia Fiber Expansion (AFEX) Venkatesh Balan, Shishir Chundawat, Bryan Bals.
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Fundamental Understanding of
Biomass Pretreatment Technologies:
The Case of Ammonia Fiber Expansion (AFEX)
Venkatesh Balan, Shishir Chundawat, Bryan Bals and Bruce Dale
Biomass Conversion Research Laboratory,Department of Chemical Engineering and Material Science
AFEX is a novel alkali based pretreatment, however, a fundamental understanding of the process is still lacking
ESCA, LSCM, SEM indicate lignin-hemicellulose degradation, solubilization and deposition on biomass surface
Liquid ammonia also cleaves hemicellulose to oligosaccharides, at specific cleavage sites possibly
Degradation products released during AFEX process: Short chain Organic Acids (acetic, lactic), Phenolic and Aromatic acids inhibit enzymes to a certain degree.
Future Studies: Wash Stream analysis for other biomasses, Effect of degradation components on microbes
References• Effect of particle size based separation of milled corn stover on
AFEX pretreatment and enzymatic digestibility (p n/a) Shishir P. S. Chundawat, Balan Venkatesh, Bruce E. Dale (In Press, J Biotech Bioeng)
• Understanding AFEX I: Inhibitory Effect of Ammonia Fiber Explosion (AFEX) Pretreatment of Corn Stover on Enzymatic
Hydrolysis. Shishir PS Chundawat, Balan Venkatesh, Bryan D Bals, Shou-Feng Chen, Christopher Becker, C Kevin Chambliss, G Peter van Walsum, Bruce E Dale (Manuscript Submitted)
• High-performance liquid chromatography method for simultaneous determination of aliphatic acid, aromatic acid and neutral degradation products in biomass pretreatment
hydrolysates. Chen SF, Mowery RA, Castleberry VA, van Walsum
GP, Chambliss CK. 2006. J Chromatogr A. 1104:54-61