Abstract

RUBIO-ARROYO, Manuel Fernando et al. Bio-ethanol Obtained by Fermentation Process with Continuous Feeding of Yeast. J. Mex. Chem. Soc [online]. 2011, vol.55, n.4, pp.242-245. ISSN 1870-249X.

In our ongoing search for renewable energy, a study on the fermentation of starch contained in sorghum and cassava was developed with the addition of commercial yeast for bio-ethanol production. The optimal reaction conditions for starch hydrolysis were determined to obtain the maximum amount of fermentable sugars. In addition, the optimal conditions of sugar concentration and fermentation time for bio-ethanol production were found. Under the applied reaction conditions, the efficiency of sorghum fermentation is higher than that of cassava fermentation. On the other hand, the effect of phosphate inorganic salts added to both fermentation processes increase ethanol production in the sorghum hydrolyzed solution. The conversion yield was higher than 84% at 72 h of fermentation (sorghum 84.10% and cassava 55.80%).

Keywords : Bio-ethanol; fermentation process; starch; yeast.

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