Dilute-acid pretreatment of corn stover using a high-solids percolation reactor |
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Authors: | Yongming Zhu Y Y Lee Richard T Elander |
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Institution: | (1) Department of Chemical Engineering, Auburn University, 36849, AL;(2) National Renewable Energy Laboratory, National Bioenergy Center, 80401 Golden, CO |
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Abstract: | Pretreatment of corn stover by dilute sulfuric acid was investigated using a laboratory percolation (flowthrough) reactor
operated under high-solids conditions. The effects of reaction conditions and operating parameters on the performance of the
percolation reactor were investigated seeking the optimal range in which acceptable levels of yield and sugar concentration
could be attained. It was demonstrated that 70–75% recovery of xylose and 6 to 7% (w/w) xylose concentration were attainable.
The high sugar concentration was obtained as a result of dense packing of dry corn stover and the low liquid throughput. Xylose
was mostly unreacted, rather than decomposed. The cellulose and the unreacted xylan of treated corn stover were both effectively
hydrolyzed by a “cellulase” enzyme preparation that also exhibits some activity on xylan. The xylose yield was affected significantly
by the flow rate under the same reaction time and conditions. This behavior appears to be related to sugar decomposition,
mass transfer resistance, and the fact that acid is neutralized by the buffering components of the biomass. |
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Keywords: | Corn stover dilute-acid hydrolysis hemicellulose percolation process pretreatment xylan |
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