SO2 prehydrolysis for high yield ethanol production from biomass |
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Authors: | Morris Wayman Sarad R Parekh |
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Institution: | (1) Department of Chemical Engineering and Applied Chemistry, University of Toronto, M5S 1A4 Toronto, Ontario, Canada |
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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. |
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Keywords: | Prehydrolysis sulphur dioxide ethanol cellulase lignocellulosics fermentation cellobiose pentose |
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