title: Production of cellulosic ethanol from sugarcane bagasse by steam explosion: Effect of extractives content, acid catalysis and different fermentation technologies.
abstract: The production of cellulosic ethanol was carried out using samples of native (NCB) and ethanol-extracted (EECB) sugarcane bagasse. Autohydrolysis (AH) exhibited the best glucose recovery from both samples, compared to the use of both H3PO4 and H2SO4 catalysis at the same pretreatment time and temperature. All water-insoluble steam-exploded materials (SEB-WI) resulted in high glucose yields by enzymatic hydrolysis. SHF (separate hydrolysis and fermentation) gave ethanol yields higher than those obtained by SSF (simultaneous hydrolysis and fermentation) and pSSF (pre-hydrolysis followed by SSF). For instance, AH gave 25, 18 and 16 g L(-1) of ethanol by SHF, SSF and pSSF, respectively. However, when the total processing time was taken into account, pSSF provided the best overall ethanol volumetric productivity of 0.58 g L(-1) h(-1). Also, the removal of ethanol-extractable materials from cane bagasse had no influence on the cellulosic ethanol production of SEB-WI, regardless of the fermentation strategy used for conversion.
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, Curitiba, PR, Brazil.
authors.forename: P V
authors.initials: PV
authors.lastname: Neves
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, Curitiba, PR, Brazil; Sugarcane Technology Center (CTC), Piracicaba, SP, Brazil.
authors.forename: A P
authors.initials: AP
authors.lastname: Pitarelo
authors.affiliation: Research Center in Applied Chemistry (CEPESQ), Department of Chemistry, Federal University of Paraná, Curitiba, PR, Brazil. Electronic address: luiz.ramos@ufpr.br.
authors.forename: L P
authors.initials: LP
authors.lastname: Ramos
mesh_terms: D001709:Biotechnology / Q000379:methods*; D002384:Catalysis; D002482:Cellulose / Q000737:chemistry*; D000431:Ethanol / Q000737:chemistry / Q000302:isolation & purification*; D005285:Fermentation; D005947:Glucose / Q000737:chemistry; D006868:Hydrolysis; D012441:Saccharomyces cerevisiae / Q000378:metabolism; D031786:Saccharum / Q000737:chemistry*; D013227:Steam; D014867:Water
chemical_list: D013227:Steam; D014867:Water; D000431:Ethanol; D002482:Cellulose; C027433:bagasse; D005947:Glucose
keywords: Acid catalysis; Cellulosic ethanol production; Ethanol extractives; Steam explosion; Sugarcane bagasse