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Hydrothermal and Acid Pretreatments Improve Ethanol Production from Lignocellulosic Biomasses
KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology. Federal University of Viçosa, Brazil.
2017 (English)In: BioResources, ISSN 1930-2126, E-ISSN 1930-2126, Vol. 12, no 2, 3088-3107 p.Article in journal (Refereed) Published
Abstract [en]

Hydrothermal and acid pretreatments using different acid charges (1.5%, 3.0%, and 4.5% H2SO4) were proposed for eucalyptus, sugarcane bagasse, and sugarcane straw prior to their bioconversion into ethanol using the semi-simultaneous saccharification and fermentation (SSSF) process. The hydrothermal and acid pretreatments were efficient for hemicelluloses removal from eucalyptus (63 to 96%), bagasse (25 to 98%), and straw (23 to 95%) and to remove a substantial amount of lignin from eucalyptus (10 to 34%) and bagasse (10 to 27%). During pretreatments, pseudo-extractives and pseudo-lignin were generated from biomasses. The SSSF was performed in pretreated biomasses using 24 h presaccharification followed by an additional 10 h of simultaneous saccharification and fermentation (SSF). With hydrothermal pretreatment, the eucalyptus presented the highest ethanol production, but only low values for SSSF parameters were obtained, as follows: ethanol yield (0.017 g(ethanol)/g(biomass)), volumetric productivity of ethanol (0.16 g L-1 h(-1)), and ethanol concentration (1.6 g L-1). On the other hand, using acid pretreatment, the straw (pretreated using 4.5% H2SO4) presented the highest ethanol production among the biomasses, assessed based on ethanol yield (0.056 g(ethanol)/g(biomass)), volumetric productivity of ethanol (0.51 g L-1 h(-1)), and ethanol concentration (5.1 g L-1).

Place, publisher, year, edition, pages
NORTH CAROLINA STATE UNIV DEPT WOOD & PAPER SCI , 2017. Vol. 12, no 2, 3088-3107 p.
Keyword [en]
Acid pretreatment, Eucalyptus wood, Hydrothermal pretreatment, Semi-simultaneous saccharification and fermentation (SSSF), Sugarcane bagasse, Sugarcane straw
National Category
Paper, Pulp and Fiber Technology
Identifiers
URN: urn:nbn:se:kth:diva-210402DOI: 10.15376/biores.12.2.3088-3107ISI: 000402883700063Scopus ID: 2-s2.0-85018904996OAI: oai:DiVA.org:kth-210402DiVA: diva2:1119451
Note

QC 20170704

Available from: 2017-07-04 Created: 2017-07-04 Last updated: 2017-07-04Bibliographically approved

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de Carvalho, Danila Morais

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