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Is Steam Explosion a Promising Pretreatment for Acid Hydrolysis of Lignocellulosic Biomass?

Steinbach, David; Kruse, Andrea; Sauer, Jörg; Storz, Jonas

Abstract:
For the production of sugars and biobased platform chemicals from lignocellulosic biomass, the hydrolysis of cellulose and hemicelluloses to water-soluble sugars is a crucial step. As the complex structure of lignocellulosic biomass hinders an efficient hydrolysis via acid hydrolysis, a suitable pretreatment strategy is of special importance. The pretreatment steam explosion was intended to increase the accessibility of the cellulose fibers so that the subsequent acid hydrolysis of the cellulose to glucose would take place in a shorter time. Steam explosion pretreatment was performed with beech wood chips at varying severities with different reaction times (25–34 min) and maximum temperatures (186–223 °C). However, the subsequent acid hydrolysis step of steam-exploded residue was performed at constant settings at 180 °C with diluted sulfuric acid. The concentration profiles of the main water-soluble hydrolysis products were recorded. We showed in this study that the defibration of the macrofibrils in the lignocellulose structure during steam explosion does not lead to an increased rate of cellulose hydrolysis. So, steam explosion is not a suitable pretreatment for acid hydrolysis of hardwood lignocellulosic biomass.

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Verlagsausgabe §
DOI: 10.5445/IR/1000129665
Veröffentlicht am 12.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 2227-9717
KITopen-ID: 1000129665
Erschienen in Processes
Verlag MDPI
Band 8
Heft 12
Seiten Art.-Nr.: 1626
Vorab online veröffentlicht am 10.12.2020
Schlagwörter glucose; xylose; 2nd generation sugars; lignocellulose; hydrolyzate; biorefinery; furfural; hydroxymethylfurfural; bioeconomy
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