Comment Re:Distillation? (Score 1) 320
Sure, that's absolutely correct, the distillation would work. It would, however, take much more energy. Instead of boiling off ~20% (by volume) of ethanol which boils at 78C, you'll need to boil off 80% of the water which boils at 100C. And then boil off the isobutanol (to separate it from the yeast and other crud). Most yeasts will conk out well before 20% ethanol, they basically die in their own excrement. I doubt that this fermentation to isobutanol would go to 20%, probably less.