Patent ID: 9637434
Date: 2017-05-02
CPC Classifications: C07C,C12P,Y02E

Claim:
1. A method for preparing ethanol comprising: a) fermentatively reacting C5 and/or C6 sugars in a fermentation solution, to yield a fermentation solution comprising volatile components, said volatile components comprising ethanol; b) converting said ethanol to a gas phase, to yield gas phase ethanol, wherein said converting to said gas phase is done in-situ, said converting comprising stripping with a carrier gas, said carrier gas comprising carbon dioxide formed during fermentation of said C5 and/or C6 sugars; c) removing the gas phase ethanol, the removal comprising passing the gas phase ethanol through a zeolite adsorber, wherein the zeolite adsorber has a SiO2/Al2O3 ratio from 200 to 1000; wherein gas phase ethanol is adsorbed to the zeolite adsorber to yield adsorbed ethanol; d) desorbing the adsorbed ethanol from the zeolite adsorber.