Abstract
The effects of vacuum cycling time on simultaneous saccharification and fermentation (SSF) of cellulose to ethanol were investigated in a 30-l reactor using mixed enzyme and a thermotolerant yeast Candida acidothermophilum. Lower vacuum cycling times (15 min cycle -1) were found to be energetically more efficient than the ones with higher duration cycles (60 min cycle -1) for conversion of delignified rice straw cellulose to ethanol. A theory has been proposed to explain the enhancement of ethanol volatility in SSF.
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