Continuous pH monitoring during pretreatment of yellow poplar wood sawdust by pressure cooking in water |
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Authors: | Weil Joseph Brewer Mark Hendrickson Richard Sarikaya Ayda Ladisch Michael R |
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Institution: | (1) Laboratory of Renewable Resources Engineering and Department of Agricultural and Biological Engineering, Purdue University, 47907 West Lafayette, IN |
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Abstract: | Yellow poplar wood sawdust consists of 41% cellulose and 19% hemicellulose. The goal of pressure cooking this material in
water is to hydrate the more chemically resistive regions of cellulose in order to enhance enzymatic conversion to glucose.
Pretreatment can generate organic acids through acid-catalyzed degradation of monosaccharides formed because of acids released
from the biomass material or the inherent acidity of the water at temperatures above 160°C. The resulting acids will further
promote the acid-catalyzed degradation of monomers that cause both a reduction in the yield and the formation of fermentation
inhibitors such as hydroxymethyl furfural and furfural. A continuous pH-monitoring system was developed to help characterize
the trends in pH during pretreatment and to assist in the development of a base (2.0 M KOH) addition profile to help keep
the pH within a specified range in order to reduce any catalytic degradation and the formation of any monosac-charide degradation
products during pretreatment. The results of this work are discussed. |
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Keywords: | Index Entries" target="_blank">Index Entries pH monitoring aqueous pretreatment pH control hydrolysis cellulose hydrothermal |
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