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https://hdl.handle.net/1822/1592
Título: | Increase of ethanol productivity in an airlift reactor with a modified draught tube |
Autor(es): | Vicente, A. A. Dluhý, M. Teixeira, J. A. |
Palavras-chave: | Ethanol productivity Airlift Fermentation Yeast flocs Static mixers Yeast floes |
Data: | Jun-1999 |
Editora: | Wiley-Blackwell |
Revista: | Canadian Journal of Chemical Engineering |
Citação: | Vicente, A.A., Dluhý, M. and Teixeira, J.A. (1999), Increase of ethanol productivity in an airlift reactor with a modified draught tube. Can. J. Chem. Eng., 77: 497-502. https://doi.org/10.1002/cjce.5450770309 |
Resumo(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. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/1592 |
DOI: | 10.1002/cjce.5450770309 |
ISSN: | 0008-4034 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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1999-22[1].pdf | 551,65 kB | Adobe PDF | Ver/Abrir |