Thermodynamic modeling of asphaltene phase behavior using PC-SAFT EoS with two different methods for asphaltene characterization
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1Department of Chemical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran
2Research Institute of Petroleum Industry, RIPI, Tehran 14857-33111, Iran
3Department of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran
Asphaltene precipitation and deposition have always been a major issue in the oil industry. In this research, asphaltene precipitation in a live oil has been modeled using PC-SAFT EoS. Two different methods for characterization of asphaltene are employed and compared. The first method of characterization has been applied for modeling of the oil in previous researches. According to this method, aromaticity of aromatics + resins, aromaticity of asphaltene, as well as molecular weight of asphaltene should be tuned. But in the second method, molecular weight of asphaltene is considered fixed, and the number of adjustable parameters is reduced to two. Asphaltene onset pressure is predicted using both methods. The results obtained from the first method show better agreement to the experimental data, and its AAD is 12% to 40% less than method #2.