Separation of branched hexane isomers on zeolite BETA

• Type: Article in International Scientific Journal
• Date: 2007

Authors

Patrick S. Bárcia (Author) Other; José A. C. Silva (Author) Other; Alírio E. Rodrigues (Author) FEUP

Journal

Title: Adsorption Science and Technology

Vol. 25 No. 3-4

Pages: 169-183

ISSN: 0263-6174

Publisher: Hindawi

Indexing

ISI Web of Knowledge - 5 Citations

ISI Web of Science

Scopus - 5 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

CORDIS: Technological sciences > Engineering > Chemical engineering

Other information

Authenticus ID: P-004-CAG

DOI: 10.1260/026361707782398173

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.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 15