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Influence of catalytic aquathermolysis on ζ potential of heavy oil asphaltenes
YI Yu feng1, LI Shu yuan1, DING Fu chen1,2
(1.College of Chemical Engineering in China University of Petroleum, Beijing 102249, China;2.School of Chemical Engineering in Beijing Institute of PetroChemical Technology, Beijing 102617, China)
Abstract:
Asphaltenes were separated from Liaohe heavy oil. Catalytic aquathermolysis of asphaltenes was investigated using iron naphthenate as catalysts at different temperature. Before and after aquathermolysis, the properties of the asphaltenes were compared by means of elemental analysis, VPO averaged relative molecular mass, 1H and 13C—NMR. Changes of diameter of colloidal granule and ζ potential of the asphaltenes were measured by the apparatus of nano granule and ζ potential tester. The results show that after the reaction, the mole ratio of H and C in asphaltenes decreases, and the relative molecular mass of the asphaltenes increases. From the results of averaged structural parameters, it is found that the aromaticy of the asphaltenes is augmented. ζ potential of the asphaltenes is negative, whose absolute value increases with the reaction degree increasing. The colloidal granule diameter of the asphaltenes decreases after slight aquathermolysis, but it increases with the reaction temperature rising.
Key words:  catalytic cracking  heavy oil  asphaltenes  iron naphthenate  diameter of colloidal granule  ζ potential