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Type: Artigo de periódico
Title: Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production
Author: Sales, F.G.
Abreu, C. A. M.
Pereira, J. A. F. R.
Abstract: 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 g-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.
Subject: catalytic wet air-oxidation
syringaldehyde p-hydroxybenzaldehyde
palladium catalyst
three-phase fluidized-bed reactor
Editor: Brazilian Society of Chemical Engineering
Citation: Brazilian Journal of Chemical Engineering. Brazilian Society of Chemical Engineering, v. 21, n. 2, p. 211-218, 2004.
Rights: aberto
Identifier DOI: 10.1590/S0104-66322004000200010
Date Issue: 1-Jun-2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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