Patent ID: 8399717
Filing Date: 2013-03-19
Classification: B01D,C07C,C12P,Y02E

Abstract:
1. A method for purifying an alcohol from a fermentation broth, comprising the following steps: a) clarifying the fermentation broth in order to obtain an aqueous solution containing the alcohol, b) adding a solvent to the aqueous solution to reach a proportion of solvent of at least 10% per weight, wherein the solvent has a boiling point which is higher than the boiling point of the alcohol to be purified, c) feeding the aqueous solution containing the solvent to a falling film evaporator, a wiped film evaporator, a thin film evaporator or a short path evaporator, for evaporation of the alcohol to be purified and drawing out of crystallized salts by the solvent, d) recovering the alcohol.