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Efficient production of ethanol by a fermentation system employing temperature profiling and recycle
Author(s) -
Kobayashi Masahide,
Ishida Kohji,
Shimizu Kazuyuki
Publication year - 1995
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.280630208
Subject(s) - ethanol , ethanol fuel , fermentation , yield (engineering) , ethanol fermentation , chemistry , pulp and paper industry , materials science , mathematics , process engineering , biochemistry , engineering , composite material
Abstract Based on a mathematical model for ethanol fermentation, the optimal pattern for changing culture temperature to maximize the final ethanol concentration was derived utilizing the maximum principle. The optimal temperature scheme started cultivation at 30°C (upper limit) descending later to 20°C (lower limit). The effects of culture temperature and ethanol concentration on growth and ethanol formation were studied by controlling the ethanol concentration at a specified level using recycle with a hollow fiber module. A novel method of operation was also investigated where temperature was initially kept at 30°C and ethanol concentration was controlled low simultaneously by the recycle system. The culture temperature was eventually lowered and the draw‐off rate through the hollow fiber stopped. This operation was shown to yield significant improvement for efficient ethanol production.