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Investigations of crude-oil emulsions at the micro-to-nano scales

•The determination of the presence of naturally occurring surfactants in the crude-oil.•Droplet size determination if emulsified water at nanoscale in the crude-oil.•Imaging of naturally surfactant made bilayer around the emulsified water in the crude-oil.•Determination of fraction of emulsified wat...

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Published in:Fuel (Guildford) 2022-04, Vol.313, p.122692, Article 122692
Main Authors: Ravaux, Florent, Medina, Sandra, Behzad, Ali R., Zafar, Humaira, George, Abraham, Morin, Stephane, Ghaffour, Noreddine, Anjum, Dalaver H.
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cited_by cdi_FETCH-LOGICAL-c372t-c2f944c066b045670dd86bd4199a46c8f42d6979734b72cafd48cb92ab30b03
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container_title Fuel (Guildford)
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creator Ravaux, Florent
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Behzad, Ali R.
Zafar, Humaira
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Ghaffour, Noreddine
Anjum, Dalaver H.
description •The determination of the presence of naturally occurring surfactants in the crude-oil.•Droplet size determination if emulsified water at nanoscale in the crude-oil.•Imaging of naturally surfactant made bilayer around the emulsified water in the crude-oil.•Determination of fraction of emulsified water at nanoscale in the crude-oil. The removal of the micro droplets of emulsified water from crude oil causes high cost and energy. In this paper we show that cryo electron microscopy (cryo-EM) imaging of micro and nano emulsions prepared from United Arab Emirate based crude oil provides critical information on their stability. Specifically, the cryoSEM imaging analysis applied to emulsion of murban-2019, and upper zakum-2019 crude-oils allowed determining naturally occurring surfactants in these crude-oils. Moreover, the applied method also turned out to be an efficient way to qualitatively investigate the effect of synthetic surfactant on the stability of the emulsions. The high resolution cryoTEM imaging analysis of emulsions from upper zakum-2019 sample enabled visualizing “bilayer” of naturally occurring surfactants, presumably the asphaltene. The cryoTEM analysis further allowed estimating the volume-fraction of emulsified water in the crude-oil at nanoscales and turned out to be about 1% for the upper zakum-2019 samples.
doi_str_mv 10.1016/j.fuel.2021.122692
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1873-7153
language eng
recordid cdi_proquest_journals_2640098663
source Elsevier
subjects Asphaltenes
Bilayers
Crude oil
Crude oil emulsions
cryoSEM
cryoTEM
Electron microscopy
Emulsions
Image resolution
Oil refining technologies
Stability analysis
Surfactants
title Investigations of crude-oil emulsions at the micro-to-nano scales
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