The Acetone–butanol–ethanol process: https://en.wikipedia.org/wiki/Acetone%E2%80%93butanol%E2%80%93ethanol_fermentation https://en.wikipedia.org/wiki/Acetone%E

The Acetone–butanol–ethanol process: https://en.wikipedia.org/wiki/Acetone%E2%80%93butanol%E2%80%93ethanol_fermentation https://en.wikipedia.org/wiki/Acetone%E2%80%93butanol%E2%80%... Obsoleted by cheaper petrochemical processes, but there's renewed interest now that environmental considerations are getting more attention, so maybe it will return to commercial use some day.