INVESTIGADORES
SEDRAN Ulises Anselmo
artículos
Título:
Assessment and Modeling of Adsorption Selectivities in the Transport of Mixtures of Hydrocarbons in FCC Catalysts
Autor/es:
ADOLFO ÁVILA; CLAUDIA M. BIDABEHERE; ULISES SEDRAN
Revista:
INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2007 vol. 46 p. 7927 - 7935
ISSN:
0888-5885
Resumen:
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Adsorption experiments
with up to 10 s contact time in a batch adsorber with a ternary mixture of
hexane, decane and toluene at 250ºC
and a binary mixture of hexane and 1-hexene at 160 ºC were used to assess
equilibrium and apparent adsorption selectivities and diffusion selectivities in an
equilibrium commercial FCC catalyst; and
confirm the predictions of a zeolite diffusion adsorption model based on the
Maxwell Stefan formulation in combination with an isotherm according to the
ideal adsorbed solution theory IAST. Hexane was the reference hydrocarbon, and
the decane and toluene apparent selectivities observed in the mixture were
higher than those of the individual cases. The predictions of the apparent
adsorption selectivities were close to the experimental values and higher than
those for diluted conditions. The stronger adsorption of decane and the
interactions between the various species within the zeolite particles
contributed positively to decane overall transport in comparison to the other
hydrocarbons in the mixture. Such interaction effects can be clearly visualized
in the simulation of the transient adsorbate concentration profiles inside the
zeolite particles. A similar behavior was observed in the case of the olefin in
the hexane/hexene mixture.