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    • 6. 发明公开
    • PROCESS FOR THE PRODUCTION OF ALCOHOL
    • 用于生产酒精
    • EP2356261A1
    • 2011-08-17
    • EP09785188.5
    • 2009-10-02
    • Weyland ASCockbain, Julian
    • WEYDAHL, Karl, Ragnar
    • C13K1/02
    • C13K1/02
    • The invention provides a process for producing alcohol from a cellulosic material, said process comprising the steps of : (i) hydrolyzing said cellulosic material with an aqueous acid to produce a hydrolysate; (ii) extracting acid and water from said hydrolysate with a water-miscible organic extraction solvent to yield (a) a first aqueous acidic solution containing said extraction solvent and (b) a residue containing sugars,- (iii) subjecting said residue to an oligosaccharide cleavage reaction to yield an aqueous solution of fermentable sugars; (iv) fermenting said fermentable sugars and distilling alcohol from the resulting fermented mixture; (v) evaporating said extraction solvent from said first solution to yield (a) a second aqueous acid solution containing no more than 10 % wt., preferably no more than 5 % wt., of said extraction solvent and (b) gaseous extraction solvent; (vi) condensing said gaseous extraction solvent for recycling; and, optionally, (vii) concentrating said second aqueous acid solution for recycling; wherein said extraction solvent is liquid at the temperature and pressure of step (ii), has a boiling point of from 25 to 60 °C at a pressure in the range 1 to 8 bar, and is such that water-soluble oligosaccharides are precipitated from solution by its addition in step (ii).