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Combined Severity Factor for Predicting Sugar Recovery in Acid-Catalyzed Pretreatment Followed by Enzymatic Hydrolysis

  • Charles E. Wyman
  • Bin Yang
Chapter

Abstract

The severity factor developed by Chornet and Overend combines the effects of temperature and time in a single function to allow translation of sugar and oligomer release results from operation at one combination of temperature and time to realize nearly the same release at a different combination of these two variables. This factor has proven very valuable in correlating results from pretreatment of a variety of cellulosic biomass materials with just hot water or steam. The severity factor concept was subsequently extended to facilitate trading off among temperature, time, and acid concentration for pretreatments that employ dilute acid to hydrolyze hemicellulose. The resulting combined severity factor can be derived from simple first-order kinetic models that have been shown to describe sugar release from dilute acid pretreatment. In addition to describing hemicellulose sugar yields, it has been shown that the combined severity factor can provide some insights into expected sugar release yields from subsequent enzymatic hydrolysis of the solids left after dilute acid pretreatment. Furthermore, a simple adjustment in one parameter of the combined severity factor makes it possible to translate from one combination of temperature, time, and acid concentration conditions that maximizes yields from acid-catalyzed breakdown of xylooligomers released in hydrothermal pretreatment of biomass to a different set of conditions for maximum sugar release.

Keywords

Switch Grass Corn Stover Cellulosic Biomass Dilute Acid Pretreatment Xylose Yield 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

We gratefully acknowledge support by the Office of Biological and Environmental Research in the DOE Office of Science through the BioEnergy Science Center (BESC). We also appreciate the support by the Ford Motor Company of the Chair in Environmental Engineering at the University of California Riverside (UCR) and the Bioproduct Sciences and Engineering Laboratory and Department of Biological Systems Engineering at Washington State University (WSU) that augments our ability to undertake such reviews.

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Copyright information

© Springer International Publishing AG 2017

Authors and Affiliations

  1. 1.Chemical and Environmental Engineering Department, Center for Environmental Research and TechnologyUniversity of California RiversideRiversideUSA
  2. 2.Bioproduct Sciences and Engineering Laboratory, Department of Biological Systems EngineeringWashington State UniversityRichlandUSA

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