Influence of pH on Stability and Dynamic Properties of Asphaltenes and Other Amphiphilic Molecules at the Oil−Water Interface

Autor:	Sandrine Poteau, Frederic Pincet, Dominique Langevin, Jean-Francois Argillier, Eric Perez
Rok vydání:	2005
Předmět:	Amphiphilic molecule General Chemical Engineering Energy Engineering and Power Technology Toluene Surface tension chemistry.chemical_compound Fuel Technology chemistry Chemical engineering Components of crude oil Solubilization Organic chemistry Oil water Synthetic surfactant Asphaltene
Zdroj:	Energy & Fuels. 19:1337-1341
ISSN:	1520-5029 0887-0624
DOI:	10.1021/ef0497560
Popis:	Oil-in-water emulsions are currently being investigated to facilitate the transport of viscous heavy oils. The behavior of these emulsions is largely controlled by the interfaces between oil drops and water. The surface-active components of crude oil, such as asphaltenes and naphthenic acids, compete among themselves at these interfaces and also with possibly added synthetic surfactant emulsifier. Here, we present a study of dynamic interfacial tension of interfaces between water and a model oil (toluene) in which variable amounts of asphaltenes are solubilized. We show that pH has a strong influence on interfacial properties of asphaltenes at the oil/water interface. At high or low pH, asphaltenes functional groups become charged, enhancing its surface activity. The influence of lower-molecular-weight surface-active species, such as the natural naphthenic acids contained in maltenes (crude oil without asphaltenes), has been investigated, and an interaction between asphaltenes and maltenes that facilitate...
Databáze:	OpenAIRE
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