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International Journal of Analytical Chemistry
Volume 2016 (2016), Article ID 4182164, 7 pages
http://dx.doi.org/10.1155/2016/4182164
Research Article

Study on Colloidal Model of Petroleum Residues through the Attraction Potential between Colloids

1College of Science, China University of Petroleum (East China), Qingdao, Shandong 266555, China
2State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao, Shandong 266555, China

Received 2 December 2015; Revised 2 March 2016; Accepted 3 March 2016

Academic Editor: Neil D. Danielson

Copyright © 2016 Long-li Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The samples of DaGang atmospheric residue (DG-AR), Middle East atmospheric residue (ME-AR), TaHe atmospheric residue (TH-AR), and their thermal reaction samples were chosen for study. All the samples were fractioned into six components separately, including saturates plus light aromatics, heavy aromatics, light resins, middle resins, heavy resins, and asphaltenes. The dielectric permittivity of the solutions of these components was measured, and the dielectric permittivity values of the components can be determined by extrapolation, which increased steadily from saturates plus light aromatics to asphaltenes. Moreover, the Hamaker constants of the components were calculated from their dielectric permittivity values. The Van der Waals attractive potential energy between colloids corresponding to various models could be calculated from the fractional composition and the Hamaker constants of every component. It was assumed that the cores of colloidal particles were formed by asphaltenes and heavy resins mainly; the other fractions acted as dispersion medium. For the three serials of thermal reaction samples, the Van der Waals attraction potential energy between colloids for this kind of model was calculated. For TH-AR thermal reaction samples, the Van der Waals attraction potential energy presented the maximum as thermal reaction is going on, which was near to the end of coke induction period.