%0 Journal Article %T Destabilisation of Water-in-Crude Oil Emulsions by Silicone Copolymer Demulsifiers %+ Transformation Intégrée de la Matière Renouvelable (TIMR) %+ IFP Energies nouvelles (IFPEN) %A Daniel-David, D. %A Le Follotec, A. %A Pezron, I. %A Dalmazzone, C. %A Noïk, C. %A Barré, L. %A Komunjer, L. %< avec comité de lecture %@ 1294-4475 %J Oil & Gas Science and Technology - Revue d'IFP Energies nouvelles %I Institut Français du Pétrole (IFP) %V 63 %N 1 %P 165-173 %8 2008-01 %D 2008 %R 10.2516/ogst:2008002 %Z Physics [physics]Journal articles %X Asphaltene aggregates are known to form viscoelastic film preventing the coalescence of droplets inwater-in-oil emulsions formed during crude oil exploitation. Since phase separation is necessary for oilrefining process, demulsifying additives are used. It was found that formulations based on polysiloxanecopolymers promote separation of water from crude oil even at very low concentration (few tens of ppm).Two alternative scenarios of emulsion destabilisation can be envisaged: (i) dissolution of asphalteneaggregates or (ii) displacement of the asphaltene network by adsorption of the more surface activecopolymer into void sites at the oil/water interface. In order to reveal the mechanism of destabilisation,interactions between asphaltene aggregates and copolymer were explored. For that purpose varioustechniques have been employed: small angle X-ray scattering allowing the determination of the influenceof copolymer on the size of asphaltene aggregate; capacity of copolymer to displace asphalteneaggregates initially adsorbed on silica particles (which simulate water droplets); Atomic ForceMicroscopy (AFM) was used to observe the influence of copolymer on the interfacial structure of asphaltene films spread on water surface. %G English %2 https://ifp.hal.science/hal-02001990/document %2 https://ifp.hal.science/hal-02001990/file/ogst07065.pdf %L hal-02001990 %U https://ifp.hal.science/hal-02001990 %~ IFP %~ UNIV-COMPIEGNE %~ OGST %~ TIMR %~ ALLIANCE-SU