Patent ID: 8968522
Filing Date: 2015-03-03
Classification: B01D,C07C,Y02P

Abstract:
1. A process comprising the steps: a) introducing a feed comprising: b) condensing the first vaporous overhead stream to produce an optional gas phase and recover a mixed condensate, wherein the mixed condensate comprises c) introducing at least a portion of the butanol phase to the first distillation column; d) introducing a first portion of the first bottoms stream into a second distillation column having at least a stripping section and optionally a rectifying section and operating the second distillation column to produce a second bottoms stream comprising the extractant and being substantially free of the at least one isomer of butanol, and a second vaporous overhead stream comprising the at least one isomer of butanol; and e) introducing at least a portion of the aqueous phase to a fermentation vessel; wherein the extractant preferentially partitions the at least one isomer of butanol over water and is separable from the at least one isomer of butanol by distillation.