Dry-grind process for fuel ethanol by continuous fermentation and stripping

Conversion of a high-solids saccharified corn mash to ethanol by continuous fermentation and stripping was successfully demonstrated in a pilot plant consuming 25 kg of corn per day. A mathematical model based on previous pil ot plant results accurately predicts the specific growth rate obtained from these latest results. This model was incorporated into a simulation of a c omplete dry-grind corn-to-ethanol plant, and the cost of ethanol production was compared with that of a conventional process. The results indicate a s avings of $0.03 per gallon of ethanol produced by the stripping process. Th e savings with stripping result from the capacity to ferment a more concent rated corn mash so there is less water to remove downstream.