Heat transfer considerations in design of a batch tube reactor for biomass hydrolysis |
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Authors: | Jacobsen Sigrid E Wyman Charles E |
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Institution: | (1) Chemical and Biochemical Engineering, Thayer School of Engineering, Dartmouth College, NH 03755 Hanover |
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Abstract: | Biologic conversion of inexpensive and abundant sources of cellulosic biomass offers a low-cost route to production of fuels
and commodity chemicals that can provide unparalleled environmental, economic, and strategic benefits. However, low-cost,
high-yiel technologies are needed to recover sugars from the hemicellulose fraction of biomass and to prepare the remaining
cellulose fraction for subsequent hydrolysis. Uncatalyzed hemicellulose hydrolysis in flow-through systems offers a number
of important advantages for removal of hemicellulose sugars, and it is believed that oligomers could play an important role
in explaining why the performance of flow-through systems differs from uncatalyzed steam explosion approaches. Thus, an effort
is under way to study oligomer formation kinetics, and a small batch reactor is being applied to capture these important intermediates
in a closed system that facilitates material balance closure for varying reaction conditions. In this article, heat transfer
for batch tubes is analyzed to derive temperature profiles for different tube diameters and assess the impact on xylan conversion.
It was found that the tube diameter must be <0.5 in, for xylan hydrolysis to follow the kinetics expected for a uniform temperature
system at typical operating conditions. |
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Keywords: | Reactors heat transfer hydrolysis kinetics pretreatment |
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