Effects of high-pressure homogenization on physicochemical properties and storage stability of switchgrass bio-oil |
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Authors: | Ronghai He X. Philip Ye Federico Harte Burton English |
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Affiliation: | 1. Department of Biosystems Engineering and Soil Science, The University of Tennessee, 2506 E. J. Chapman Dr, Knoxville, TN 37996-4514, United States;2. Department of Food Science and Technology, The University of Tennessee, 2605 River Drive, Knoxville, TN 37996-4591, United States;3. Department of Agricultural Economics, The University of Tennessee, 2621 Morgan Circle, Knoxville, TN 37996-4518, United States |
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Abstract: | A high-pressure homogenization (HPH) technique was used to improve the physicochemical properties and storage stability of switchgrass bio-oil. The viscosity, ethanol-insoluble fraction, and mass average molecular weight (Mw) of the bio-oil decreased significantly, and particle size became smaller after HPH processing; however, no significant changes were detected in heating value, water content, density, pH value, or ash content. The bio-oil's chemical composition changed after HPH: amounts of some compounds (furfural, levoglucosan, diethoxymethyl acetate, and lignin-derived compounds) increased, while others (acetic acid and 1,2-ethanediol) decreased. The homogenization processing remarkably improved switchgrass bio-oil stability: the viscosity of bio-oil homogenized at 100 MPa increased by only 13.9% after storage at 40 °C for 60 days, whereas that of unhomogenized oil increased 56% after the same storage period. The operating cost was very modest at only $0.0102/L for bio-oil HPH processing at 100 MPa. |
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Keywords: | Bio-oil High-pressure homogenization Physicochemical properties Stability |
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