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Integrated process of clean fractionation and hydrothermal treatment for prairie cord grass

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  2010 Pittsburgh, Pennsylvania, June 20 - June 23, 2010  1008847.(doi:10.13031/2013.32003)
Authors:   Iwona Cybulska, Hanwu Lei, James Julson
Keywords:   Clean fractionation, hydrothermal pre-treatment, prairie cord grass, enzymatic hydrolysis

Abstract A clean fractionation/hydrothermal sequential process was developed to fractionate and pretreat prairie cord grass prior to ethanol fermentation. The main focus was to eliminate the usage of mineral catalysts and reduce the reaction time and lower the temperature. In order to achieve this goal a two-step process was applied. First clean fractionation was applied to extract lignin, then the remaining material was subjected to a hydrothermal treatment process to enhance cellulose digestibility. Clean fractionation solvent was used in different proportions of the constituents. Process efficiency was determined by lignin recovery, and the independent variables/factors were solvent composition, as well as time and temperature applied to each sequential process. Cellulose digestibility during enzymatic hydrolysis and glucose conversion rate were calculated. Optimal conditions yielded a 20% lignin recovery rate and 92% glucose conversion rate.

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