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Abstract
The rheological properties of acid hydrolyzed corn stover at high solids concentration (20–35 wt.%) were investigated using torque rheometry. These materials are yield stress fluids whose rheological properties can be well represented by the Bingham model. Yield stresses increase with increasing solids concentration and decrease with increasing hydrolysis reaction temperature, acid concentration, and rheometer temperature. Plastic viscosities increase with increasing solids concentration and tend to decrease with increasing reaction temperature and acid concentration. The solids concentration dependence of the yield stress is consistent with that reported for other fibrous systems. The changes in yield stress with reaction conditions are consistent with observed changes in particle size. This study illustrates that torque rheometry can be used effectively to measure rheological properties of concentrated biomass.
Keywords
Biomass,
corn stover,
rheology,
yield stress,
viscosity,
acid hydrolysis,
corn stover as fuel,
residues,
hydrolysis,
temperature,
chemical reactions,
biomass energy,
alcohol,
high solids concentration,
rheometry,
Bingham model,
particle sizes,
ethanol
Citation
Ehrhardt, M.R.; Monz, T.O.; Root, T.W.; Connelly, R.K.; Scott, T.C.; Klingenberg, D.J. 2010. Rheology of dilute acid hydrolyzed corn stover at high solids concentration. Applied Biochemistry and Biotechnology. 160(4): 1102-1115.
