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    INTERFACIAL ENERGY DURING THE EMULSIFICATION OF WATER-IN-HEAVY CRUDE OIL EMULSIONS

    Year: 2015

    Journal: BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING, Vol. 32, p 127-137, 20170208

    Authors: Karcher, V.; Perrechil, F. A.; Bannwart, A. C.

    Organizations: Univ Estadual Campinas, UNICAMP, Fac Mech Engn, Dept Petr Engn, BR-13083860 Campinas, SP, Brazil; Univ Estadual Campinas, UNICAMP, Ctr Petr Studies, BR-13083970 Campinas, SP, Brazil

    The aim of this study was to investigate the interfacial energy involved in the production of water-in-oil (W/O) emulsions composed of water and a Brazilian heavy crude oil. For such purpose an experimental set-up was developed to measure the different energy terms involved in the emulsification process. W/O emulsions containing different water volume fractions (0.1, 0.25 and 0.4) were prepared in a batch calorimeter by using a high-shear rotating homogenizer at two distinct rotation speeds (14000 and 22000 rpm). The results showed that the energy dissipated as heat represented around 80% of the energy transferred to the emulsion, while around 20% contributed to the internal energy. Only a very small fraction of the energy (0.02 - 0.06%) was stored in the water-oil interface. The results demonstrated that the high energy dissipation contributes to the kinetic stability of the W/O emulsions.