Colloidal stabilization of clays by asphaltenes in hydrocarbon media

Effect of surface acidity and basicity of aluminas on asphaltene adsorption and oxidation

“…Heavy polar hydrocarbons, such as asphaltenes, are the main hindrances in production and processing of heavy oils due to their complexity and unidentifiable chemical structure [1][2][3][4][5]. They usually are defined as the fraction of heavy oil that is insoluble in low molecular weight paraffin such as n-heptane while soluble in light aromatic hydrocarbons such as toluene [6].…”

Adsorption-desorption of n–C7 asphaltenes over micro- and nanoparticles of silica and its impact on wettability alteration

“…Several experimental studies on asphaltene adsorption on solid surfaces have been reported in the literature (Adams, 2014;González and Moreira, 1991;Marczewski and Szymula, 2002;Marlow, Sresty, Hughes, & Mahajan, 1987;Pernyeszi and Dékány, 2001;Pernyeszi, Patzko, Berkesi, & Dékány, 1998Szymula and Marczewski, 2002) to understand the influence of the asphaltene chemical structure and composition (Dudášová, Flåten, Sjöblom, & Øye, 2009;Dudášová, Simon, Hemmingsen, & Sjöblom, 2008), the solvent or precipitant used (Dubey and Waxman, 1991;Nassar, 2010), the surface chemistry (Dudášová et al, 2009;Franco, Montoya, Nassar, Pereira-Almao, & Cortés, 2013b. Nassar, 2010Nassar, Hassan, & Pereira-Almao, 2011a.…”

Chemical derivatization of Athabasca oil sand asphaltene for analysis of hydroxyl and carboxyl groups via nuclear magnetic resonance spectroscopy

“…Although minerals and clays have hydrophilic properties, they can be partitioned into oleophilic media, such as toluene, owing to the adsorption of bitumen and organic molecules on ultra®ne particles, some ,200 mm in size [22,61]. Stabilization of the resultant sols and microemulsions can be actuated via net negative charges on the dispersed phase by substitution of Al 31 or Si 41 with lower valency isomorphous metal ions.…”

“…A consequence of the hydro-and oleophilic character of the oil sands is that a variety of colloids can exist in situ and in the extracted fractions [60,61]. Although minerals and clays have hydrophilic properties, they can be partitioned into oleophilic media, such as toluene, owing to the adsorption of bitumen and organic molecules on ultra®ne particles, some ,200 mm in size [22,61].…”