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Phenomenological continuum theory of asphaltene-stabilized oil/water emulsions

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posted on 03.11.2017 by Gyula Toth, Juri Selvag, Bjorn Kvamme
In this paper we use a phenomenological continuum theory of the Ginzburg-Landau type to address emulsion formation in water/light hydrocarbon/asphaltene systems. Based on the results of recent molecular dynamics simulations, we first calibrate the model parameters and show, that the theory produces a reasonable equation of state. Next, the coalescence of oil droplets is studied by a convection-diffusion dynamics as a function of both the surface coverage and the viscosity contrast between the as- phaltene and the bulk liquids. We show, that, besides the traditional thermodynamic interpretation of emulsion formation, the timescale of drop coalescence can be con- trolled independently from the interfacial tension drop, which offers an alternative, solely kinetic driven mechanism of emulsion formation.

Funding

This work has been supported by the VISTA basic research programme project No. 6359 "Surfactants for water/CO2/hydrocarbon emulsions for combined CO2 storage and utilization" of the Norwegian Academy of Science and Letters and the Statoil.

History

School

  • Science

Department

  • Mathematical Sciences

Published in

Energy & Fuels

Volume

31

Issue

2

Pages

1218 - 1225

Citation

TOTH, G.I., SELVAG, J. and KVAMME, B., 2017. Phenomenological continuum theory of asphaltene-stabilized oil/water emulsions. Energy & Fuels, 31(2), pp. 1218-1225.

Publisher

© American Chemical Society (ACS)

Version

AM (Accepted Manuscript)

Publisher statement

This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Publication date

2017-01-27

Copyright date

2017

Notes

This document is the Accepted Manuscript version of a Published Work that appeared in final form in Energy & Fuels, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acs.energyfuels.6b02430.

ISSN

0887-0624

eISSN

1520-5029

Language

en

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