Open AccessSORPTION KINETICS OF AROMATICS IN Y ZEOLITE PELLETS USING THE GRAVIMETRIC METHOD
Author(s) -
Candice Torres de Melo Bezerra Cavalcante,
Verôonica E. Lima,
Irla G. Souza,
Odelsia Leonor Sánchez de Alsina
Publication year - 1997
Publication title -
brazilian journal of chemical engineering/brazilian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.313
H-Index - 52
eISSN - 1678-4383
pISSN - 0104-6632
DOI - 10.1590/s0104-66321997000300001
Subject(s) - sorption , toluene , chemistry , diffusion , gravimetric analysis , kinetics , zeolite , pellets , mass transfer , adsorption , chemical engineering , chromatography , analytical chemistry (journal) , thermodynamics , materials science , organic chemistry , catalysis , physics , quantum mechanics , composite material , engineering
The sorption kinetics of some aromatics (toluene, p-xylene, o-xylene and p-diethylbenzene) was studied experimentally with a high sensitivity microbalance (± 1µg) at temperatures between 150 and 210oC and concentrations in the adsorbed phase of a maximum of 1 mmol/g. In general, the sorption rates decreased in the following order: toluene > p-xylene > o-xylene > p-diethylbenzene. Two diffusion models were tested against the experimental results. One model considers the mass transfer inside the zeolitic micropores as the controlling diffusion step. The other model supposes that resistance to mass transfer in the macropores (formed during pelletization of the crystals with the amorphous ligand) is the limiting step. The results observed for both models are presented and analyze