Patent ID: 8815552
Filing Date: 2014-08-26
Classification: C12M,C12P,Y02E

Abstract:
1. A method for producing a fermentation product in a fermentation system from a biomass comprising the steps of: (i) pre-treating the biomass with an aqueous composition comprising an effective concentration of acid for reducing formation of inhibitors at a temperature of about 130° C. to about 170° C. for a period of time sufficient to produce a solids component and an aqueous component, which aqueous component comprises xylose and acetic acid; (ii) supplying the aqueous component to the fermentation system; (iii) providing yeast to the fermentation system in a concentration in the range from 5 to less than 150 grams of yeast on a dry basis per liter of the aqueous component, wherein the yeast can ferment the xylose into the fermentation product; (iv) maintaining the aqueous component and yeast in the fermentation system at a temperature of between about 26° C. and about 37° C. and at a pH of between about 4.5 and about 6.0 for a time of no less than 18 hours; and (v) recovering the fermentation product from the fermentation system; wherein the biomass comprises lignocellulosic material.