Optimisation of steam pretreatment of SO2-impregnated mixed softwoods for ethanol production

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Optimisation of steam pretreatment of SO2-impregnated mixed softwoods for ethanol production. / Stenberg, K; Tengborg, C; Galbe, Mats; Zacchi, Guido.

I: Journal of Chemical Technology and Biotechnology, Vol. 71, Nr. 4, 1998, s. 299-308.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

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TY - JOUR

T1 - Optimisation of steam pretreatment of SO2-impregnated mixed softwoods for ethanol production

AU - Stenberg, K

AU - Tengborg, C

AU - Galbe, Mats

AU - Zacchi, Guido

PY - 1998

Y1 - 1998

N2 - Pretreatment of mixed softwoods with SO2 impregnation and steam for production of ethanol has been investigated. The optimal conditions, both for sugar yield and ethanol yield, to assess the effect of inhibitors formed in the pretreatment, have been determined. The parameters investigated were: SO2 concentration (1-6% (w/w) dry matter), temperature (190-230 degrees C) and residence time (2-15 min). After pretreatment, the material was separated into a solid residue and a filtrate. The solid residue was enzymatically hydrolysed with 2% dry matter (w/w). To investigate fermentability, the hydrolysed filtrate was fermented using Saccharomyces cerevisiae. The effects of the different parameters are described by response-surface modelling. The highest experimental sugar yield of 42.1 g per 100 g dry matter was obtained at 210 degrees C and 5.5 min residence time. Although the fermentabilities were good for all filtrates with yields greater than 90% of the yield obtained in a pure glucose reference solution, the pretreatment has a clear influence on the ethanol production rate. (C) 1998 SCI.

AB - Pretreatment of mixed softwoods with SO2 impregnation and steam for production of ethanol has been investigated. The optimal conditions, both for sugar yield and ethanol yield, to assess the effect of inhibitors formed in the pretreatment, have been determined. The parameters investigated were: SO2 concentration (1-6% (w/w) dry matter), temperature (190-230 degrees C) and residence time (2-15 min). After pretreatment, the material was separated into a solid residue and a filtrate. The solid residue was enzymatically hydrolysed with 2% dry matter (w/w). To investigate fermentability, the hydrolysed filtrate was fermented using Saccharomyces cerevisiae. The effects of the different parameters are described by response-surface modelling. The highest experimental sugar yield of 42.1 g per 100 g dry matter was obtained at 210 degrees C and 5.5 min residence time. Although the fermentabilities were good for all filtrates with yields greater than 90% of the yield obtained in a pure glucose reference solution, the pretreatment has a clear influence on the ethanol production rate. (C) 1998 SCI.

KW - SO2

KW - steam pretreatment

KW - softwoods

KW - ethanol

KW - enzymatic hydrolysis

KW - fermentation

U2 - 10.1002/(SICI)1097-4660(199804)71:4<299::AID-JCTB858>3.0.CO;2-Z

DO - 10.1002/(SICI)1097-4660(199804)71:4<299::AID-JCTB858>3.0.CO;2-Z

M3 - Article

VL - 71

SP - 299

EP - 308

JO - Journal of Chemical Technology and Biotechnology

JF - Journal of Chemical Technology and Biotechnology

SN - 0268-2575

IS - 4

ER -