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TitleIncrease of ethanol productivity in an airlift reactor with a modified draught tube
Author(s)Vicente, A. A.
Dluhý, M.
Teixeira, J. A.
KeywordsEthanol productivity
Yeast flocs
Static mixers
Yeast floes
Issue dateJun-1999
JournalCanadian Journal of Chemical Engineering
Citation"Canadian Journal of Chemical Engineering". ISSN 0008-4034. 77 (1999) 497-502.
Abstract(s)Static mixers were introduced in the draught tube of a three-phase, concentric tube type airlift bioreactor, resulting in a 30% increase in ethanol productivity during glucose fermentation with a highly flocculent strain of Saccharomyces cerevisiae. Increased productivity was obtained as a consequence of the floc size reduction provoked by the new design of the draught tube and of the smaller applied aeration rates, allowing a higher dilution rate to be used. Steady state data at different dilution rates were measured for both systems and the results were compared in terms of specific consumption / production rates and ethanol productivity. An approach based on heterogeneous catalysis principles was used in order to consider the presence of porous yeast flocs. Total glucose conversion was achieved at a dilution rate of 0.34 hˉ¹. The smaller floc size contributed to the higher observed reaction rates by reducing diffusional limitations inside the flocs. The respiratory quotient had a constant value (around 23) at all dilution rates, meaning that the metabolic state of the cells in the flocs remained constant, having a strong fermentative metabolism.
AccessOpen access
Appears in Collections:CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series

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