Int. J. of Oil, Gas and Coal Technology   »   2017 Vol.14, No.3



Title: The evolution of heavy crude oil's asphaltene particle size distribution by elevating temperature


Authors: Somayeh Kananpanah; Mahmoud Bayat; Mohammad Ali Mousavian


other 1-Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran 2-Research Institute of Petroleum Industry (RIPI), Post Office Box 14665-137, Tehran
Research Institute of Petroleum Industry (RIPI), Tehran, Iran
Department of Chemical Engineering, Faculty of Engineering, University of Tehran, Tehran, Iran


Abstract: Temperature variation during crude production, transportation, and processing gives heavy organic deposition problems. Asphaltene particle size evolution from two Iranian heavy crudes (I and II) in thermal de-asphaltene in the absence of n-alkane by temperature variations from 60°C to 160°C was investigated by dynamic light scattering. Onset and optimum asphaltene dissociation temperatures were specified as characteristic parameters for thermal de-asphaltene. Onset temperatures for crudes and are 100°C and 80°C, respectively. Maximum asphaltene particle size and best filtration rate occurred at 150°C and 120°C for crudes I and II, respectively, suggesting asphaltene optimum isolation temperature. Particle aggregation size decreased from 60°C to onset temperature, increased from onset to optimum temperature and decreased by passing optimum temperature. Size decrease over optimum temperature confirmed partial reversibility of asphaltene dissociation mechanism. Results suggest operating temperature in thermal de-asphaltene approaches between onset and optimum temperatures with maximum yield at optimum temperature, which is crude dependent. [Received: August, 3, 2015; Accepted: November 25, 2015]


Keywords: heavy crude oil; thermal de-asphaltene; temperature variation; aggregation size; dynamic light scattering; DLS; Fourier transform infrared; FTIR; particle size distribution; filtration rate; isolation temperature; asphaltene particle size.


DOI: 10.1504/IJOGCT.2017.10002916


Int. J. of Oil, Gas and Coal Technology, 2017 Vol.14, No.3, pp.232 - 246


Available online: 01 Feb 2017



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