Adsorptive removal of organic chloride from model jet fuel by Na-LSX zeolite: Kinetic, equilibrium and thermodynamic studies

摘要

The commercial Na-loaded low-silica X zeolite (Na-LSX) was used as adsorbent for the removal of organic chloride compound (5-chloro-2-methylaniline) from model jet fuel. The Na-LSX adsorbent was characterized by XRD, BET, FT-IR, SEM-EDS, and XRF, respectively. A series of experiments were carried out to investigate the adsorption performance of organic chloride onto Na-LSX zeolite by batch adsorption experiments. In the batch experiments, some key operational parameters, such as temperature, adsorption time, initial concentration of organic chloride in model jet sample as well as the dosage of adsorbent were investigated. Equilibrium isotherms were analyzed by using Langmuir, Freundlich, Temkin and Dubinin-Radushkevich (D-R) adsorption models. The pseudo-first-order, the pseudo second-order and intra-particle diffusion models were used to fit the kinetics data. The results revealed that Langmuir isotherm provided a better fit to the experimental data than other isotherms. And it was also found that the adsorption kinetics followed the pseudo second-order kinetic equation well. The thermodynamic analysis results indicated that the adsorption process was an endothermic, feasible and spontaneous process under the specified conditions. Above mentioned investigation results implied that the Na-LSX zeolite would be an effective adsorbent for adsorption removal of organic chloride from distillate of crude oil. (C) 2016 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.