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2017 | OriginalPaper | Chapter

13. Adaptation of Severity Factor Model According to the Operating Parameter Variations Which Occur During Steam Explosion Process

Authors : Nicolas Jacquet, Aurore Richel

Published in: Hydrothermal Processing in Biorefineries

Publisher: Springer International Publishing

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Abstract

The severity factor model developed by Chornet and Overend in 1987 has become the standard method to estimate the intensity of steam explosion pretreatment of biomass feedstocks. Continuous records of operating conditions applied during steam explosion show that significant variations occur during the process and have an impact on the treatment severity. The two main parameters that vary significantly during the process are temperature (linked to the pressure) and pH. Temperature variation is especially significant at the beginning of the process when pressure increases to its target value. pH variation is observed throughout the process. pH variation occurs due to the evolution of organic acids during vapocracking.”

This chapter discusses a variation of the severity factor determination, adapted to treat complex dynamics which are not taken into account by the severity factor model currently in use. The first part of the chapter presents the steam explosion technology and its effect on lignocellulosic biomass and describes a typical process installation. The second part is focused on the adaptation of the severity factor model to temperature and pH variation. Finally, a general equation for severity is developed based on the true evolution of temperature and pH during steam explosion.”

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previous chapter Steam Explosion as a Hydrothermal Pretreatment in the Biorefinery Concept

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Title: Adaptation of Severity Factor Model According to the Operating Parameter Variations Which Occur During Steam Explosion Process
Authors: Nicolas Jacquet
Aurore Richel
Publisher: Springer International Publishing
Book: Hydrothermal Processing in Biorefineries
Print ISBN: 978-3-319-56456-2

Electronic ISBN: 978-3-319-56457-9

Copyright Year: 2017
DOI: https://doi.org/10.1007/978-3-319-56457-9_13