Wet oxidation of recalcitrant lignin water solutions: experimental and reaction kinetics |
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Authors: | Merit Kindsigo Marjaana Hautaniemi Juha Kallas |
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Institution: | (1) Department of Chemical Technology, Lappeenranta University of Technology, P.O. Box 20, 53851 Lappeenranta, Finland |
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Abstract: | The purpose of the research was to study the behavior of lignin degradation under different conditions (T 110–190°C, pO2 0.5–1.5 MPa, pH 5, 9 and 12) and to develop a predictive model. Temperature increase improved lignin removal from 75% at
110°C to 100% at 190°C (experimental). Increasing the pH enhanced the lignin removal efficiency from 30 to 97% (experimental).
The developed model predicted the lignin degradation and changes in COD, BOD and TOC. The model agreed well with the experimental
data (R
2 = 0.93 at pH 5 and 12). |
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Keywords: | |
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