Shrinking-bed model for percolation process applied to dilute-acid pretreatment/hydrolysis of cellulosic biomass |
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Authors: | Chen Rongfu Wu Zhangwen Lee Y Y |
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Institution: | (1) Department of Chemical Engineering, Auburn University, 36849, AL |
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Abstract: | For many lignocellulosic substrates, hemicellulose is biphasic upon dilute-acid hydrolysis, which led to a modified percolation
process employing simulated two-stage reverse-flow. This process has been proven to attain substantially higher sugar yields
and concentrations over the conventional single-stage percolation process. The dilute-acid pretreatment of biomass solubilizes
the hemicellulose fraction in the solid biomass, leaving less solid biomass in the reactor and reducing the bed. Therefore,
a bed-shrinking mathematic kinetic model was developed to describe the two-stage reverse-flow reactor operated for hydrolyzing
biphasic substrates, including hemicellulose, in corn cob/stover mixture (CCSM). The simulation indicates that the shrinking-bed
operation increases the sugar yield by about 5%, compared to the nonshrinking bed operation in which 1 reactor volume of liquid
passes through the reactor (i.e.,t = 1.0). A simulated optimal run further reveals that the fast portion of hemicellulose is almost completely hydrolyzed in
the first stage, and the slow portion of hemicellulose is hydrolyzed in the second stage. Under optimal conditions, the bed
shrank 27% (a near-maximum value), and a sugar yield over 95% was attained. |
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Keywords: | Index Entries" target="_blank">Index Entries Dilute-acid pretreatment modeling shrinking bed percolation corn cobs/stover mixture |
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