Contact
    Start Publications Interfacial tension in water/n-decane/naphthenic acid systems ...
    ←  Publication Finder
    Attension

    Interfacial tension in water/n-decane/naphthenic acid systems predicted by a combined COSMO-RS theory and pendant drop experimental study

    Year: 2020

    Journal: Mol. Phys., Volume 118, SEP 16

    Authors: Olesen, Kristian B.; Pedersen, Anne-Sofie Dahl; Nikolajsen, Lasse, V; Andersson, Martin P.; Solling, Theis, I; Sauer, Stephan P. A.; Mikkelsen, Kurt, V

    Organizations: Danish Chemical Society [2018-26]; Center of Exploitation of Solar Radiation, Department of Chemistry, University of Copenhagen

    Keywords: Interfacial tension; water; n-decane; naphthenic acid systems; COSMO-RS theory; pendant drop experiment

    The interfacial tension of systems containing water, n-decane, and model naphthenic acids were investigated using a predictive model based on COSMO-RS theory and experimental pendant drop measurements. Five naphthenic acid homologues that are considered to be representative of surfactants inherent to crude oil were dissolved in n-decane at equal concentrations. The interfacial tensions of the five systems at an acid concentration of 1.66 mol% relative to n-decane were experimentally determined to be 27-30 mN/m. The interfacial tensions of the five different acid-decane phases against water were also predicted using density functional theory (DFT) calculations and COSMO-RS theory. The accuracy of the predictions was very good as confirmed through pendant drop measurements of the interfacial tension. The mean-absolute-deviation between experimental and predicted values was 2.6 mN/m thus demonstrating the high predictive power of COSMO-RS theory for calculating the interfacial tension at oil-water interfaces in the presence of surface-active compounds.
    View publication