عنوان مقاله [English]
In this paper, static adsorption tests were performed using asphaltene extracted from a sample of crude oil from Iranian southern oil fields and different reservoir rock minerals. The amount of adsorbed asphaltene was calculated after determining the equilibrium concentration by UV/VIS method (328 nm). The adsorption isotherms of asphaltene on Kaolin, Calcite, Dolomite, and Quartz were analyzed and compared. Among the different minerals, the maximum adsorption was found for Kaolin. Modified Langmuir isotherm was used for comparing between the model and experimental data. Modified Langmuir coefficients were obtained from four linearized modified Langmuir equations by linear regression method. Kaolin, Calcite, and Quartz followed the Langmuir isotherm, indicating that there was the monolayer formation of adsorbed asphaltenes onto the surface; however, the adsorption behavior of Dolomite was different from the others and does not follow the Langmuir isotherm. It indicated the multilayers formation of asphaltenes onto the surface. Multilayer adsorption was justified using the modified Langmuir isotherm. There was good agreement between the model and the experimental data. The values of R2 at their optimum X for Kaolin, Calcite, Dolomite, and Quartz were 0.991, 0.994, 0.95, and 0.991 respectively.
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