Journal
BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING
Volume 21, Issue 2, Pages 211-218Publisher
BRAZILIAN SOC CHEMICAL ENG
DOI: 10.1590/S0104-66322004000200010
Keywords
catalytic wet air-oxidation; lignin; vanillin; syringaldehyde p-hydroxybenzaldehyde; palladium catalyst; three-phase fluidized-bed reactor
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In the present work a process of catalytic wet air oxidation of lignin obtained from sugar-cane bagasse is developed with the objective of producing vanillin, syringaldehyde and p-hydroxybenzaldehyde in a continuous regime. Palladium supported on gamma-alumina was used as the catalyst. The reactions in the lignin degradation and aldehyde production were described by a kinetic model as a system of complex parallel and series reactions, in which pseudo-first-order steps are found. For the purpose of producing aromatic aldehydes in continuous regime, a three-phase fluidized reactor was built, and it was operated using atmospheric air as the oxidizer. The best yield in aromatic aldehydes was of 12%. The experimental results were compatible with those values obtained by the pseudo-heterogeneous axial dispersion model (PHADM) applied to the liquid phase.
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