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Colloids Interfaces 2018, 2(2), 13;

Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces

Department of Chemical Engineering, Centro Universitário FEI, Av. Humberto de Alencar Castelo Branco, 3972, São Paulo CEP 09850-901, Brazil
Author to whom correspondence should be addressed.
Received: 5 March 2018 / Revised: 19 March 2018 / Accepted: 21 March 2018 / Published: 23 March 2018
(This article belongs to the Special Issue Colloids and Interfaces in Oil Recovery)
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Crude oil asphaltenes contain a wide series of chemical species, which includes the most polar compounds and interfacially active agents from the petroleum. Asphaltenes have been considered to be implicated in foam and emulsion formation during the petroleum recovery and production process. In this work, the interfacial activity of organic solutions containing asphaltene and n-alcohols was investigated. Asphaltene extraction from a 28°API crude oil produced 2.5 wt % of n-pentane precipitated asphaltene (C5I). Dynamic surface and interfacial tensions of asphaltene solutions were assessed by the pendant drop method. Asphaltene films were evaluated at the air-water interface using a Langmuir trough. Results were expressed by means of the interfacial tension time-dependence. Interfacial tension measurements showed alcohols reduce the toluene/water interfacial tension of asphaltene solutions. The interfacial tension was reduced from 23 mN/m to 15.5 mN/m for a 2 g/L solution of asphaltene plus n-butanol. Higher asphaltene concentrations did not affect the toluene/air surface tension. The effects of n-alcohols on the asphaltene surface activity was dependent on the asphaltene aggregation state. n-Alcohols modify the asphaltene film elasticity and the film phase behavior. View Full-Text
Keywords: asphaltene; surface and interfacial tension; alcohols; monolayer; petroleum asphaltene; surface and interfacial tension; alcohols; monolayer; petroleum

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Martins, R.G.; Martins, L.S.; Santos, R.G. Effects of Short-Chain n-Alcohols on the Properties of Asphaltenes at Toluene/Air and Toluene/Water Interfaces. Colloids Interfaces 2018, 2, 13.

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