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SO2 prehydrolysis for high yield ethanol production from biomass
Authors:Morris Wayman  Sarad R Parekh
Institution:(1) Department of Chemical Engineering and Applied Chemistry, University of Toronto, M5S 1A4 Toronto, Ontario, Canada
Abstract:The advantages of the use of SO2 in steam pretreatment are described. Two different large scale continuous reactors, the Stake and the Wenger, have been used for this purpose. Pine, aspen and corn stover were prehydrolysed by SO2 in these reactors and hydrolysed by enzymes. The solution of hexoses and pentoses so obtained were fermented byPichia stipitis R, yielding 372, 346 and 388 L ethanol/tonne for the 3 feedstocks, respectively. When a mixed culture ofP. stipitis R, which is an excellent pentose fermenter, andBrettanomyces clausenii which is an excellent cellobiose fermenter, was used in a simultaneous saccharification-fermentation made with SO2-prehydrolysed aspen, the yield rose to 384 L/tonne. These are higher yields than have been reported in the literature to date.
Keywords:Prehydrolysis  sulphur dioxide  ethanol  cellulase  lignocellulosics  fermentation  cellobiose  pentose
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