Asphaltene-induced spontaneous emulsification: Effects of interfacial co-adsorption and viscoelasticity

Rodríguez-Hakim, Mariana, Anand, Satyam, Tajuelo, Javier, Yao, Zhen, Kannan, Aadithya y Fuller, Gerald G. . (2020) Asphaltene-induced spontaneous emulsification: Effects of interfacial co-adsorption and viscoelasticity. Journal of Rheology 64 (4): 799–816

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Título Asphaltene-induced spontaneous emulsification: Effects of interfacial co-adsorption and viscoelasticity
Autor(es) Rodríguez-Hakim, Mariana
Anand, Satyam
Tajuelo, Javier
Yao, Zhen
Kannan, Aadithya
Fuller, Gerald G.
Materia(s) Física
Abstract Asphaltenes are a class of high molecular weight aromatic compounds found in crude oil. They adsorb onto toluene-water interfaces and induce a spontaneous emulsification phenomenon, whereby stable water-in-oil emulsions form without the need of an external energy input. This work aims to control and understand the factors affecting spontaneous droplet formation in the presence of asphaltene adsorption. This is particularly useful for crude oil refining, where the presence of a stable emulsion hampers the efficiency of downstream processing operations. We explore the effect of the addition of copolymers designed as crude oil flow improvers as a means to control the extent of emulsion formation. We find that the polymers competitively adsorb onto the toluene-water interface and diminish spontaneous emulsification. We also conduct fluorescence microscopy experiments and measurements of the interfacial energy to determine the mechanism of spontaneous emulsification in asphaltene systems. We conclude that an emulsion forms via the diffusion of molecular water into the oil phase and subsequent binding with asphaltene aggregates, leading to the nucleation of micrometer-sized water droplets. We find that the polymer forms complexes with the dissolved asphaltenes, possibly hampering the ability of diffused water to bind to the asphaltenes and reducing the extent of spontaneous emulsification. Finally, we investigate the role of interfacial shear and dilatational viscoelasticity to better understand which fundamental interfacial properties are important in the emulsification of asphaltene-laden systems. We find that the rate of formation of an interfacial microstructural network is inversely correlated with the extent and rate of spontaneous emulsification.
Editor(es) American Institute of Physics
Fecha 2020-07-01
Formato application/pdf
Identificador bibliuned:DptoFF-FCIE-Articulos-Mrodriguez-0002
http://e-spacio.uned.es/fez/view/bibliuned:DptoFF-FCIE-Articulos-Mrodriguez-0002
DOI - identifier https://doi.org/10.1122/1.5145307
ISSN - identifier 0148-6055; eISSN: 1520-8516
Número de Volumen 64
Número de Issue 4
Página inicial 799
Página final 816
Publicado en la Revista Journal of Rheology 64 (4): 799–816
Idioma eng
Versión de la publicación publishedVersion
Tipo de recurso Article
Derechos de acceso y licencia http://creativecommons.org/licenses/by-nc-nd/4.0
info:eu-repo/semantics/openAccess
Tipo de acceso Acceso abierto
Notas adicionales The registered version of this article, first published in Journal of Rheology, 1 July 2020; 64 (4): 799–816, is available online at the publisher's website: American Institute of Physics, https://doi.org/10.1122/1.5145307
Notas adicionales La versión registrada de este artículo, publicado por primera vez en Journal of Rheology, 1 July 2020; 64 (4): 799–816, está disponible en línea en el sitio web del editor: American Institute of Physics, https://doi.org/10.1122/1.5145307

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Creado: Mon, 05 Feb 2024, 20:26:38 CET