METHOD FOR PRODUCING BIOETHANOL BY ENZYMATIC TECHNIQUE USING CELLULOSIC BIOMASS AS RAW MATERIAL
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United States of America Patent
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Mar 11, 2021
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Dec 10, 2018
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Dec 19, 2017
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Abstract
A bioethanol production method using lignocellulosic biomass as a raw material, the method being adapted to increase the ethanol concentration of a fermentation liquid obtained in a fermentation step and reduce the distillation load without having to use specialized equipment in solubilizing the biomass by enzymatic hydrolysis of cellulose contained in the biomass. When a solid residue of the cellulosic biomass, from which hemicellulose has been removed, is mixed with an aqueous solution containing a cellulose-hydrolyzing enzyme in a reaction vessel, ethanol is added in an amount of 3 to 6% by mass. Bacterial proliferation is suppressed during hydrolysis of cellulose, and the ethanol concentration achieved in ethanol fermentation of a saccharified solution is increased, so that the distillation load is reduced. The ethanol added at the time of hydrolysis can be collected during distillation of the alcoholic fermentation liquid and reused.
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