Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
6637262 | Fuel | 2014 | 7 Pages |
Abstract
Barley straw was pretreated with alkali (NaOH) at increasing NaOH/DM ratios (6-10%) and neutralized in a twin-screw extruder, obtaining a substrate ready for the incubation with enzymes. Two process configurations were evaluated: with and without filtration inside the extruder. The enzymatic digestibility of the pretreated substrates was evaluated and filtration was proved to be beneficial for the enzymatic hydrolysis. A maximum enzymatic hydrolysis yield of 71% was attained for the barley straw pretreated with 8Â g NaOH/100Â g dry barley straw and filtration inside the extruder. The ethanol production was evaluated on this substrate for increasing solid loadings, 2.5, 15 and 20% (w/v). A global process yield based on ethanol production, including hydrolysis and fermentation, was calculated over the pretreated material in experiments at 20% (w/v) solids, reaching 53% of the maximum theoretical. The concentration of ethanol reached up to 29Â g/l in these conditions.
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Chemical Engineering
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Authors
A. Duque, P. Manzanares, I. Ballesteros, M.J. Negro, J.M. Oliva, F. Saez, M. Ballesteros,