Vol 33(2017) N 3 p. 47-56; DOI 10.21519/0234-2758-2017-33-3-47-56
E.A Skiba*, O.V. Baibakova, V.V. Budaeva, I.N. Pavlov, E.I. Makarova, G.F. Mironova, Yu.A. Kriukov, G.V. Sakovich

Bioethanol from Oat Hulls Pretreated by Alkaline Delignification. II. Scaling of Alcoholic Fermentation up to Pilot Process

The Institute for Problems in Chemical-and-Energy Technologies, Russ. Acad. Sci., Siberian Branch, 659322, Biysk Russia

Received - 31.08.2016; Accepted - 22.11.2016


The enzymatic hydrolysis in aqueous medium of the product of oat hulls alkaline delignification has been studied. For the initial loading of the oat-hull alkaline delignification product of 60 g/L, The yield of reducing sugars was observed to decline by 9% of substrate weight when an acetate buffer was substituted by an aqueous medium; the yield reduced by more 13.6% as a result of the sca-ling-up. Simultaneous enzymatic hydrolysis and alcoholic fermentation enables a 1.2-fold increase in the ethanol yield as compared to the separate hydrolysis and fermentation, the filtration stage of the enzymatic hydrolysate being omitted and the total time of the process being shortened by a factor of 1.5. Under pilot production conditions (a 63-L digester), the process of ethanol production from alkali-treated oat hulls was successfully scaled with the ratio 1:400 and ethanol yield of 12 dal/t raw material. The pilot-scale ethanol sample has extremely low percentage of methanol (0.005 % vol.).

alcoholic fermentation, bioethanol, enzymatic hydrolysis in aqueous medium, oat hulls, scaling by volume.