FIELD: chemistry.
SUBSTANCE: method of fermenting low-molecular weight sugar to ethanol involves mixing low-molecular weight sugar, one or more fermenting microorganisms and modified biomass, fermenting the low-molecular weight sugar in conditions that are suitable for converting sugar to ethanol. The modified biomass has bulk density of less than about 0.5 g/cm3 and contains cellulose fibres that have been substantially irradiated and contain carboxylic acid groups. The fermenting microorganism includes yeast selected from a group consisting of S. cerevisiae and P. Stipitis or Zymomonas mobilis bacteria.
EFFECT: invention enables to obtain ethanol with output of at least 140%.
17 cl, 40 dwg, 78 tbl, 32 ex
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