| abstract |
The present invention provides: a method for preparing high purity butanol with high selectivity and high productivity comprising (1) a step wherein a microorganism is used to ferment biomass, (2) a step wherein n-butanoic acid is separated from the fermented liquid obtained from (1), (3) a step wherein the n-butanoic acid separated in (2) is subjected to direct reduction in gas phase on a ruthenium hydrogenation catalyst or on a copper nano complex catalyst with hydrogen, and (4) a step wherein butanol is purified by distillation of butanol obtained by hydrogenation; and a hydrogenation catalyst for realizing the above. |