Journal
BIOPROCESS AND BIOSYSTEMS ENGINEERING
Volume 37, Issue 9, Pages 1907-1915Publisher
SPRINGER
DOI: 10.1007/s00449-014-1165-x
Keywords
Lignocellulosic bioethanol; Pretreatment; Rice straw; Saccharification and fermentation; Response surface methodology
Funding
- Rural Development Administration of Korea [PJ009298]
- Rural Development Administration (RDA), Republic of Korea [PJ009298012014] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A CO2-added ammonia explosion pretreatment was performed for bioethanol production from rice straw. The pretreatment conditions, such as ammonia concentration, CO2 loading level, residence time, and temperature were optimized using response surface methodology. The response for optimization was defined as the glucose conversion rate. The optimized pretreatment conditions resulting in maximal glucose yield (93.6 %) were determined as 14.3 % of ammonia concentration, 2.2 MPa of CO2 loading level, 165.1 A degrees C of temperature, and 69.8 min of residence time. Scanning electron microscopy analysis showed that pretreatment of rice straw strongly increased the surface area and pore size, thus increasing enzymatic accessibility for enzymatic saccharification. Finally, an ethanol yield of 97 % was achieved via simultaneous saccharification and fermentation. Thus, the present study suggests that CO2-added ammonia pretreatment is an appropriate process for bioethanol production from rice straw.
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