Importance of asphaltene aggregation in solution in determining the adsorption of this sample on mineral surfaces

Acevedo, Sócrates; Ranaudo, María Antonieta; García, Coromoto; Castillo, Jimmy; Fernández, Alberto; Caetano, Manuel; Goncalvez, Sonia

doi:10.1016/s0927-7757(99)00502-6

Cited by 109 publications

(165 citation statements)

References 15 publications

Supporting

Mentioning

150

Contrasting

Order By: Relevance

“…Very often adsorption of asphaltenes is described in terms of Langmuir isotherm [34,35,37], however our analysis shows that in most cases it is not possible [31]. For comparison we supply two Fig.…”

Section: Soil Fraction Codementioning

confidence: 99%

“…Because of their interfacial activity, asphaltenes are of special interest from a colloidal point of view . Asphaltenes can adsorb electrolyte ions from brine solution [28][29][30] and they may be adsorbed from organic solution on rock reservoir and soils [1,[31][32][33][34][35][36][37][38][39]. One should expect, that these adsorption processes are further complicated by the behaviour of asphaltenes in organic solutions.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Szymula

Marczewski

2002

Applied Surface Science

View full text Add to dashboard Cite

Adsorption of asphaltenes on soils is one of the important problems, though largely underestimated, in environment protection of Lublin region. Asphaltene adsorption properties affect the way the contamination spreads in soil. Analysis of this phenomenon may help in localisation and elimination of oil spills. The asphaltenes studied were obtained from local drills (Ś widnik near Lublin, Poland). In our previous paper, we investigated adsorption of asphaltenes from toluene on rock components (quartz, dolomite, calcite, kaolin as well as pure iron and titanium oxides). In order to simulate the natural oil spill conditions, we used toluene as solvent and typical soils from Lublin region as adsorbents (black earth, peat soil, lessive soil, brown soil, sandy podsolised soil, pararendzina soil). Main physicochemical properties of these soils were reported. Moreover, basic adsorption properties (nitrogen adsorption, adsorption of surfactants from water solutions, acidity, etc.) of several soil fraction were studied. We decided to use only certain mineral fractions with highest adsorption capacity, as other fractions have limited impact on total adsorption. Adsorption on soil fraction gives also some insight into relative importance of various soil components on summary soil properties. The results of adsorption measurements are described in terms of physical adsorption on heterogeneous solids. # 2002 Published by Elsevier Science B.V.

show abstract

Section: Soil Fraction Codementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Szymula

Marczewski

2002

Applied Surface Science

View full text Add to dashboard Cite

show abstract

“…Asphaltenes as an organic colloid can adsorb electrolyte ions from aqueous solutions [1][2][3]36]. However, they may themselves be adsorbed from the organic phase on rock reservoirs [5,[37][38][39][40][41]. These adsorption processes are further complicated by the behaviour of asphaltenes in organic solutions.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of asphaltenes from toluene on mineral surface

Marczewski

Szymula

2002

Colloids and Surfaces A: Physicochemical and Engineering Aspect

170

124

View full text Add to dashboard Cite

Undesirable adsorption of asphaltenes on rock minerals was studied. Asphaltenes are an important component of crude oil, being also natural surfactant stabilising water/crude oil emulsions. Owing to their chemical nature, asphaltenes are able to associate, form micelles and create a surface charge at the interface. Asphaltenes may be adsorbed on rock reservoir from the organic solvents in crude oil and as an organic colloid, they can adsorb electrolyte ions from aqueous solution. In order to simulate natural conditions we used asphaltenes from local drills, toluene as solvent and several typical oxides and carbonate rock components or minerals as adsorbents. Our study included natural Brazilian quartz, dolomite, calcite and kaolin, as well as pure oxides: Fe 2 O 3 and TiO 2 . The typical shape of asphaltene adsorption isotherms was obtained for all systems studied with the characteristic 'steps' which indicate changes in the state of asphaltene molecules in the solution and at the mineral surface. Those changes are related to the asphaltene association and further formation of hemimicelles and micelles.

show abstract

“…Such asphaltenes are the heaviest and most polar compounds of crude oil in which they tend to aggregate into fractal clusters of discotic nanoaggregates 01005-p. 16 JDN 21 (16) formed by an aromatic dense core and a highly aliphatic shell (17) that is described in the SANS course of this volume). Due to their surfactant properties, these clusters are able to adsorb solid-liquid interfaces (18), which may have important effects such as wettability alteration in petroleum reservoirs. During oil production, the pressure decrease near the wellbore can also induce the flocculation of the asphaltene fractions resulting in reduction of the porous volume by pore blockage and/or multilayer formation.…”

Section: Asphaltene Adsorption Mechanism Under Shear Flow Probed By Imentioning

confidence: 99%

Neutron reflectivity

Cousin

Menelle

2015

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The specular neutron reflectivity is a technique enabling the measurement of neutron scattering length density profile perpendicular to the plane of a surface or an interface, and thereby the profile of chemical composition. The characteristic sizes that are probed range from around 5 Å up 5000 Å. It is a scattering technique that averages information on the entire surface and it is therefore not possible to obtain information within the plane of the interface. The specific properties of neutrons (possibility of tuning the contrast by isotopic substitution, sensitivity to magnetism, negligible absorption, low energy of the incident neutrons) makes it particularly interesting in the fields of soft matter, biophysics and magnetic thin films. This course is a basic introduction to the technique and does not address the magnetic reflectivity. It is composed of three parts describing respectively its principle and its formalism, the experimental aspects of the method (spectrometers, samples) and two examples related to the materials for energy.Résumé. La réflectivité spéculaire des neutrons est une technique permettant de mesurer le profil de densité de longueur de diffusion de neutron, et ce faisant le profil de composition chimique, perpendiculairement à une surface ou une interface plane. Les tailles caractéristiques sondées sont de l'ordre de 5 Å à 5000 Å. C'est une technique de diffusion qui moyenne l'information sur l'ensemble de la surface et qui ne permet donc pas d'obtenir d'informations dans le plan de l'interface. Les propriétés spécifiques des neutrons (possibilité de moduler le contraste par substitution isotopique, sensibilité au magnétisme, absorption négligeable, faible énergie des neutrons incidents) la rendent particulièrement intéressante dans les domaines de l'étude de la matière molle, de la biophysique et des couches minces magnétiques. Ce cours est une simple introduction à la technique et ne traite pas la réflectivité magnétique. Il est composé de trois parties décrivant respectivement son principe et son formalisme, les aspects expérimentaux de la méthode (spectromètres, échantillons) et deux exemples en lien avec les matériaux pour l'énergie.

show abstract

Importance of asphaltene aggregation in solution in determining the adsorption of this sample on mineral surfaces

Cited by 109 publications

References 15 publications

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Adsorption of asphaltenes from toluene on mineral surface

Neutron reflectivity

Contact Info

Product

Resources

About