Hybrid process for the conversion of lignocellulosic materials |
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Authors: | K C Patrick Lee Millicent Bulls John Holmes John W Barrier |
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Institution: | (1) Department of Biotechnology, Tennessee Valley Authority ERC, CEB 1C-M, AL 35662 Muscle Shoals |
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Abstract: | Because of the recalcitrant nature of lignocellulosic materials, it is important to pretreat the biomass in order to obtain
a suitable material for the bioconversion. In this study, two different types of pretreatments were performed. The first experiment
used a 2-gal Parr reactor operated at 140, 150,160, and 170‡C with sulfuric acid concentrations varying from 0.5 to 2%. A
second pretreatment was performed with a two-stage low-temperature process. The first-stage pretreatment was performed at
100 or 120‡C with sulfuric acid concentrations of 0.5, 2, and 5% followed by a secondstage pretreatment at 120‡C with 2% acid
concentration. The best residues for enzymatic hydrolysis and simultaneous saccharification and fermentations (SSF) came from
the higher temperature pretreatment with the Parr reactor. However, a large portion of the xylose fraction was degraded to
furfural and glucose was degraded to HMF. On the contrary, the two-stage low temperature pretreatment resulted in a very low
percentage of xylose degradation, and no glucose degradation. The residues from this two-stage pretreatment performed satisfactorily
toward the production of ethanol by SSFs. This study discusses the results obtained from these experiments. |
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Keywords: | Biomass lignocellulosic materials ethanol fermentation simultaneous saccharification and fermentation (SSF) Saccharomyces cerevisiae pretreatment enzymatic hydrolysis |
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