Process optimization for ethanol production from photoperiod-sensitive sorghum: Focus on cellulose conversion

► Photoperiod sensitive sorghum is a new feedstock for ethanol production. ► Response surface methodology was employed to optimize the process. ► About 0.21 g ethanol was obtained from 1 g PS sorghum. Photoperiod-sensitive sorghum, as a competitive biomass for ethanol production, was investigated to...

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Bibliographic Details
Published in:Industrial crops and products 2011-07, Vol.34 (1), p.1212-1218
Main Authors: Xu, Feng, Theerarattananoon, Karnnalin, Wu, Xiaorong, Pena, Leidy, Shi, Yong-Cheng, Staggenborg, Scott, Wang, Donghai
Format: Article
Language:English
Subjects:
acetates
biomass production
buffers
Cellulose
enzymatic hydrolysis
Ethanol
ethanol production
Fermentation
glucose
Photoperiod-sensitive sorghum
Response surface methodology
saccharification
Sorghum
sulfuric acid
Sulfuric acid pretreatment
temperature
yeasts
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Summary:► Photoperiod sensitive sorghum is a new feedstock for ethanol production. ► Response surface methodology was employed to optimize the process. ► About 0.21 g ethanol was obtained from 1 g PS sorghum. Photoperiod-sensitive sorghum, as a competitive biomass for ethanol production, was investigated to develop an integrated process for improving ethanol yield. Response surface methodology was employed to study the relationship between pretreatment variables (including temperature, sulfuric acid concentration, and reaction time) and cellulose recovery, as well as efficiency of enzymatic hydrolysis (EEH) in the solid part. Recovery yield decreased and EEH increased as the pretreatment temperature, acidic concentration, and reaction time increased. A model was successfully developed to predict total glucose yield with a maximum value of 82.2%. Conditions of co-fermentation were also optimized, and the optimal ethanol yield was obtained with constant-temperature simultaneous saccharification and fermentation at 38 °C. Acetate buffer at a concentration of 50 mM was found helpful for increasing efficiency of enzymatic hydrolysis, as well as ethanol yield. The maximum ethanol yield was 0.21 g ethanol per dry mass at the conditions of 38 °C, 0.05 g yeast/L, and 50 mM acetate buffer. A complete cellulose balance was provided for the whole process.
ISSN:0926-6690
1872-633X
DOI:10.1016/j.indcrop.2011.04.012