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Rheology of Dilute Acid Hydrolyzed Corn Stover at High Solids Concentration

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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.

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Acknowledgments

This project was supported in part by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2006-35504-17401.

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Authors and Affiliations

  1. Department of Chemical and Biological Engineering, University of Wisconsin, Madison, WI, 53706, USA

    M. R. Ehrhardt, T. O. Monz, T. W. Root & D. J. Klingenberg

  2. Rheology Research Center, University of Wisconsin, Madison, WI, 53706, USA

    M. R. Ehrhardt, T. O. Monz, T. W. Root & D. J. Klingenberg

  3. Department of Biological Systems Engineering, University of Wisconsin, Madison, WI, 53706, USA

    R. K. Connelly

  4. Department of Food Science, University of Wisconsin, Madison, WI, 53706, USA

    R. K. Connelly

  5. US Forest Service Forest Products Laboratory, Madison, WI, 53706, USA

    C. T. Scott

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  1. M. R. Ehrhardt
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  2. T. O. Monz
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  3. T. W. Root
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  6. D. J. Klingenberg
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Correspondence to D. J. Klingenberg.

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Ehrhardt, M.R., Monz, T.O., Root, T.W. et al. Rheology of Dilute Acid Hydrolyzed Corn Stover at High Solids Concentration. Appl Biochem Biotechnol 160, 1102–1115 (2010). https://doi.org/10.1007/s12010-009-8606-z

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  • DOI: https://doi.org/10.1007/s12010-009-8606-z

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