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



Document title: Catalytic wet-air oxidation of lignin in a three-phase reactor with aromatic aldehyde production
Journal: Brazilian journal of chemical engineering
Database: PERIÓDICA
System number: 000308929
ISSN: 0104-6632
Authors: 1
2
3
Institutions: 1Universidade Federal do Ceara, Centro de Tecnologia, Fortaleza, Ceara. Brasil
2Universidade Federal de Pernambuco, Centro de Tecnologia, Recife, Pernambuco. Brasil
3Universidade Estadual de Campinas, Faculdade de Engenharia Quimica, Campinas, Sao Paulo. Brasil
Year:
Season: Jun
Volumen: 21
Number: 2
Pages: 211-218
Country: Brasil
Language: Inglés
Document type: Artículo
Approach: Experimental, aplicado
English 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
Disciplines: Química
Keyword: Ingeniería química,
Catálisis,
Oxidación por aire húmedo,
Lignina,
Vainillina,
Siringaldehído,
p-hidroxibenzaldehído,
Catalizadores,
Paladio,
Reactor de lecho fluidizado
Keyword: Chemistry,
Chemical engineering,
Catalysis,
Wet air oxidation,
Lignin,
Vanillin,
Syringaldehyde,
p-hydroxybenzaldehyde,
Catalysts,
Palladium,
Fluidized bed reactor
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