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Metal Ion Interactions with Crude Oil Components: Specificity of Ca2+ Binding to Naphthenic Acid at an Oil/Water Interface

Taylor, Spencer E and Chu, Hiu Tung (2018) Metal Ion Interactions with Crude Oil Components: Specificity of Ca2+ Binding to Naphthenic Acid at an Oil/Water Interface Colloids and Interfaces, 2 (3), 40.

Metal ion Interactions with crude oil components - Specificity of Ca2+ binding to naphthenic acid at an oil-water interface, Taylor and Chu, Coll Int, 2018.pdf - Version of Record
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On the basis of dynamic interfacial tension measurements, Ca2+ has been shown specifically to interact with naphthenic acid (NA) at the n-heptane/water interface, consistent with NA adsorption followed by interfacial complexation and formation of a more ordered interfacial film. Optimum concentrations of Ca2+ and NA have been found to yield lower, time-dependent interfacial tensions, not evident for Mg2+ and Sr2+ or for several alkali metal ions studied. The results reflect the specific hydration and coordination chemistry of Ca2+ seen in biology. Owing to the ubiquitous presence of Ca2+ in oilfield waters, this finding has potential relevance to the surface chemistry underlying crude oil recovery. For example, “locking” acidic components at water/oil interfaces may be important for crude oil emulsion stability, or in bonding bulk oil to mineral surfaces through an aqueous phase, potentially relevant for carbonate reservoirs. The relevance of the present results to low salinity waterflooding as an enhanced crude oil recovery technique is also discussed.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Chemistry
Authors :
Taylor, Spencer
Chu, Hiu Tung
Date : 18 September 2018
DOI : 10.3390/colloids2030040
Copyright Disclaimer : Copyright 2018 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (
Uncontrolled Keywords : dynamic interfacial tension; interfacial complexation; low salinity waterflooding; metal ion interactions; naphthenic acid; oil recovery
Depositing User : Melanie Hughes
Date Deposited : 30 Nov 2018 10:36
Last Modified : 30 Nov 2018 10:36

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