Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production

Brazilian Journal of Chemical Engineering

F.g. Sales²  C. A. M. Abreu¹  J. A. F. R. Pereira¹ 

[1] ,Universidade Federal do Ceará Centro de Tecnologia Departamento de Engenharia QuímicaFortaleza CE ,Brazil

关键词: catalytic wet air-oxidation;    lignin;    vanillin;    syringaldehyde p-hydroxybenzaldehyde;    palladium catalyst;    three-phase fluidized-bed reactor;   

DOI  :  10.1590/S0104-66322004000200010

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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