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Separation of branched hexane isomers on zeolite BETA

Título
Separation of branched hexane isomers on zeolite BETA
Tipo
Artigo em Revista Científica Internacional
Ano
2007
Autores
Patrick S. Bárcia
(Autor)
Outra
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José A. C. Silva
(Autor)
Outra
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Alírio E. Rodrigues
(Autor)
FEUP
Revista
Vol. 25 3-4
Páginas: 169-183
ISSN: 0263-6174
Editora: Hindawi
Indexação
Classificação Científica
FOS: Ciências da engenharia e tecnologias > Engenharia química
CORDIS: Ciências Tecnológicas > Engenharia > Engenharia química
Outras Informações
ID Authenticus: P-004-CAG
Resumo (PT): An experimental study of the single, binary, ternary and quaternary fixed bed adsorption of hexane isomers onto zeolite BETA was performed covering the temperature range between 423 K and 523 K and partial pressures up to 0.3 bar. Adsorption equilibrium isotherms were collected from breakthrough experiments. Based on an analysis of sorption events at the molecular level, a Tri-Site Langmuir model (TSL) was developed to interpret the equilibrium data with good accuracy. At the partial pressures studied, it was found that the degree of branching was related to the affinity; the sorption hierarchy was most favourable towards the linear isomer and least favourable towards the di-branched ones. A mathematical model based on a linear driving force (LDF) was developed and used to test the experimental data. It was found that the model predicted the behaviour of the fixed bed experiments with good accuracy. Zeolite BETA demonstrated significant selectivity between branched C6 isomers (especially at low coverage), thereby suggesting a means of solving this difficult separation problem.
Abstract (EN): An experimental study of the single, binary, ternary and quaternary fixed bed adsorption of hexane isomers onto zeolite BETA was performed covering the temperature range between 423 K and 523 K and partial pressures up to 0.3 bar. Adsorption equilibrium isotherms were collected from breakthrough experiments. Based on an analysis of sorption events at the molecular level, a Tri-Site Langmuir model (TSL) was developed to interpret the equilibrium data with good accuracy. At the partial pressures studied, it was found that the degree of branching was related to the affinity; the sorption hierarchy was most favourable towards the linear isomer and least favourable towards the di-branched ones. A mathematical model based on a linear driving force (LDF) was developed and used to test the experimental data. It was found that the model predicted the behaviour of the fixed bed experiments with good accuracy. Zeolite BETA demonstrated significant selectivity between branched C-6 isomers (especially at low coverage), thereby suggesting a means of solving this difficult separation problem.
Idioma: Inglês
Tipo (Avaliação Docente): Científica
Nº de páginas: 15
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