Applied Biochemistry and Biotechnology

, Volume 70, Issue 1, pp 99–111

Continuous pH monitoring during pretreatment of yellow poplar wood sawdust by pressure cooking in water

  • Joseph Weil
  • Mark Brewer
  • Richard Hendrickson
  • Ayda Sarikaya
  • Michael R. Ladisch
Session 1: Feedstock Supply and Processing

DOI: 10.1007/BF02920127

Cite this article as:
Weil, J., Brewer, M., Hendrickson, R. et al. Appl Biochem Biotechnol (1998) 70: 99. doi:10.1007/BF02920127

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.

Index Entries

pH monitoring aqueous pretreatment pH control hydrolysis cellulose hydrothermal 

Copyright information

© Humana Press Inc. 1998

Authors and Affiliations

  • Joseph Weil
    • 1
  • Mark Brewer
    • 1
  • Richard Hendrickson
    • 1
  • Ayda Sarikaya
    • 1
  • Michael R. Ladisch
    • 1
  1. 1.Laboratory of Renewable Resources Engineering and Department of Agricultural and Biological EngineeringPurdue UniversityWest Lafayette

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