Reaction Kinetics of the Hydrothermal Treatment of Lignin |
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Authors: | Bo Zhang Hua-Jiang Huang Shri Ramaswamy |
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Institution: | (1) BioTechnology Institute, University of Minnesota, 140 Gortner Labs, 1479 Gortner Avenue, St. Paul, MN 55108, USA;(2) Department of Bioproducts and Biosystems Engineering, University of Minnesota, Kaufert Lab, 2004 Folwell Avenue, St. Paul, MN 55108, USA |
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Abstract: | Lignins derived from abundant and renewable resources are nontoxic and extremely versatile in performance, qualities that
have made them increasingly important in many industrial applications. We have shown recently that liquefaction of lignin
extracted from aspen wood resulted in a 90% yield of liquid. In this paper, the hydrothermal treatment of five types of lignin
and biomass residues was studied: Kraft pine lignin provided by MeadWestvaco, Kraft pine lignin from Sigma-Aldrich, organosolv
lignin extracted from oat hull, the residues of mixed southern hardwoods, and switchgrass after hydrolysis. The yields were
found dependent on the composition or structure of the raw materials, which may result from different pretreatment processes.
We propose a kinetic model to describe the hydrothermal treatment of Kraft pine lignin and compare it with another model from
the literature. The kinetic parameters of the presented model were estimated, including the reaction constants, the pre-exponential
factor, and the activation energy of the Arrhenius equations. Results show that the presented model is well in agreement with
the experiments. |
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Keywords: | Hydrothermal treatment Degradation Kinetic model Kraft lignin Biomass residue |
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