The utilization of sweet potato vines as carbon sources for fermenting bio-butanol
Journal
Journal of the Taiwan Institute of Chemical Engineers
Journal Volume
79
Journal Issue
S1
Pages
7-13
Date Issued
2017-10
Author(s)
Abstract
In this study, domestic sweet potato vines were selected as the lignocellulosic material for producing monosaccharides where monosaccharides as produced were used for biobutanol production by Clostridium acetobutylicum. First, the compositional analysis showed that dried sweet potato vines consisted of 17.7 +/- 1.5 wt. % cellulose, 4.0 +/- 1.4 wt. % hemicellulose, 17.2 +/- 1.0 wt. % lignin, 1.5 +/- 0.3 wt. % ash, and 8.5 +/- 0.5 wt. % moisture. The combination of acid-pretreatment and enzymatic hydrolysis provided a good total glucose and xylose yields of 0.74 gig-glucose(total) and 0.99 gig-xylose(total). However, 0.25 g/gg-glucose(total) and 0.68 g/g-xylose(total) were released during the acid pretreatment and therefore results in a low sugar concentration in the enzymatic hydrolysis liquid. On the other hand, the combination of alkali pretreatment and enzymatic hydrolysis provided total glucose and xylose yields of 0.64 g/g-glucose(total) and 0.63 g/g-xylose(total) and most of released sugars were found in the enzymatic hydrolysate. The enzymatic hydrolysate of the alkali-pretreated sweet potato vines (1.5 wt. % NaOH, 12 wt. % sample loading, and a reaction time of 20 min) was used as feedstock for acetone-butanol-ethanol (ABE) fermentation and 6.4 +/- 0.2 of butanol was obtained in 72 h with the butanol yield of 0.18 g/g-sugar(total). In summary, the efficiency of converting dried sweet potato vines to bio-butanol was 23%.
Subjects
Ipomoea batatas Lam
Sweet potato vines
Clostridium acetobutylicum
Acetone-butanol-ethanol (ABE) fermentation
Lignocellulosic butanol
Semi-simultaneous saccharification fermentation (sSSF)
Publisher
Elsevier
Type
journal article