Abstract
In the solvent deasphalting process, it is necessary to study the interaction between metal porphyrins and asphaltene for improving demetallization efficiency (vanadyl or nickel). Therefore, the main aim of this study is to investigate the adsorption kinetics and thermodynamics of nickel etioporphyrins onto Canadian oil sands bitumen vacuum tower bottom (VTB) asphaltene, and to compare the results with that of vanadyl etioporphyrins onto VTB asphaltene in pentane. Asphaltene was characterized by transmission electron microscopy (TEM), N2 adsorption, and X-ray diffraction technique (XRD). The results showed that vanadyl/nickel porphyrins were adsorbed onto the VTB asphaltene. The adsorption rate varied as the dosage of asphaltene, the concentration of vanadyl/nickel porphyrins, and the adsorption temperature changed. By comparison of the pseudo-first-order adsorption kinetics model of the two adsorption processes, the adsorption rate for nickel octaethylporphyrin (Ni-OEP) was faster than that for vanadyl o...
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