Application of a depolymerization model for predicting thermochemical hydrolysis of hemicellulose |
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Authors: | Todd Lloyd Charles E Wyman |
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Institution: | (1) Thayer School of Engineering, Dartmouth College, 8000 Cummings Hall, 03755 Hanover, NH |
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Abstract: | Literature data were collected and analyzed to guide selection of conditions for pretreatment by dilute acid and water-only
hemicellulose hydrolysis, and the severity parameter was used to relate performance of different studies on a consistent basis
and define attractive operating conditions. Experiments were then run to confirm performance with corn stover. Although substantially
better hemicellulose sugar yields are observed when acid is added, costs would be reduced and processing operations simplified
if less acid could be used while maintaining good yields, and understanding the relationship between operating conditions
and yields would be invaluable to realizing this goal. However, existing models seldom include the oligomeric intermediates
prevalent at lower acid levels, and the few studies that include such species do not account for the distribution of chain
lengths during reaction. Therefore, the polymeric nature of hemicellulose was integrated into a kinetic model often used to
describe the decomposition of synthetic polymers with the assumption that hemicellulose linkages are randomly broken during
hydrolysis. Predictions of monomer yields were generally consistent with our pretreatment data, data reported in the literature,
and predictions of other models, but the model tended to overpredict oligomer yields. These differences need to be resolved
by gathering additional data and improving the model. |
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Keywords: | Hemicellulose hydrolysis kinetic model dilute acid depolymerization |
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