Abstract
The steam explosion was carried out in the absence (autohydrolysis) and presence of phosphoric acid to evaluate the effects of temperature (180 and 210 °C), acid concentration (0 and 19 mg g-1, dry basis) and pretreatment time (5 and 10 min) on the structure and reactivity of sugarcane bagasse. Glucan recovery was used as the main response factor for pretreatment optimization through a central composite design. Autohydrolysis at 210 °C for 10 min had a good pretreatment performance but phosphoric acid catalysis (19 mg g-1) resulted in better yields under considerably milder conditions (180 °C, 5 min). Hydrolysis of both substrates for 96 h using 8 wt.% total solids and 30 mg g-1 Cellic® CTec2 (Novozymes) provided total glucose yields of 75% in average. The production of cellulosic ethanol was assessed by both separate and simultaneous hydrolysis and fermentation using Saccharomyces cerevisiae. Freeze-drying of pretreatment water solubles reduced the concentration of furfural, hydroxymethylfurfural and acetic acid by more than 80% and this eliminated their inhibitory effect on yeast fermentation.
Highlights
Ethanol is one of the most important renewable liquid biofuels and its use in large scale contributes directly to the reduction of the environmental impact of fossil fuels, in the transportation sector
Regardless of the conditions used for pretreatment, both anhydroglucose and lignin contents increased in STB-WW compared to native bagasse
These results are mainly attributed to the acid hydrolysis of hemicellulose components
Summary
Ethanol is one of the most important renewable liquid biofuels and its use in large scale contributes directly to the reduction of the environmental impact of fossil fuels, in the transportation sector. First generation production technologies are able to convert sucrose or starch hydrolysates into fuel ethanol while second generation technologies are based on the use of lignocellulosic materials for the same purpose. This latter production process is much more complicated because it involves different unit operations including raw material preparation, pretreatment, washing to remove inhibitors, enzymatic hydrolysis, hexose and/or pentose fermentation, ethanol recovery and effluent treatment.[1,2,3]. An ideal pretreatment method must be economically viable and environmentally friendly
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