Electrokinetic and adsorption properties of asphaltenes

Kokal, Sunil; Tang, Thompson; Schramm, Laurier L.; Sayegh, S.G.

doi:10.1016/0927-7757(94)03007-3

Cited by 121 publications

(94 citation statements)

References 16 publications

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“…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%

“…Nitrogen and oxygen atoms can also be present in aromatic structures analogous to pyridine, pyrazine, pyrrole, carbozole, indole or benzoic acid. Sulphur atoms are essentially present in thiophene and organic sulphur [5][6][7]. However, the composition of asphaltenes depends upon the origin of crude oil and the method of extraction [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of asphaltenes from toluene on mineral surface

Marczewski

Szymula

2002

Colloids and Surfaces A: Physicochemical and Engineering Aspect

172

124

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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.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Adsorption of asphaltenes from toluene on mineral surface

Marczewski

Szymula

2002

Colloids and Surfaces A: Physicochemical and Engineering Aspect

172

124

View full text Add to dashboard Cite

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“…Owing to various functional groups, i.e. carboxylic, hydroxyl, ether, ester, aldehyde, ketone, amine and amide, asphaltenes are able to create a surface charge at the interface [1][2][3]. Because of their interfacial activity, asphaltenes are of special interest from a colloidal point of view .…”

Section: Introductionmentioning

confidence: 99%

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Szymula

Marczewski

2002

Applied Surface Science

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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.

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“…Electrokinetic, electrophoretic and adsorption properties of asphaltenes are studied through potentiometric and electrokinetic measurements in great details on various crude oils which firmly established its charge-bearing properties and streaming potential (Kokal et al 1995;Leon et al 2000;Gonzalez et al 2003;Parra-Barraza et al 2003). Asphaltenes in aqueous solutions are found to possess surface charge as a result of protonation and dissociation reactions of functional groups enabling electrophoretic mobility (Janusz and Jablonski 2000).…”

Section: Introductionmentioning

confidence: 99%

Dynamic asphaltene deposition control in pipe flow through the application of DC potential

Hashmi

Ghosh

2014

J Petrol Explor Prod Technol

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Asphaltene-resin moieties in crude oil are found to carry residual surface electric charge, which is characteristics to their colloidal structure, asphaltene-resin ratio and system pH. This research investigated the possibilities of controlling asphaltene deposition in oil well by applying static electrical potential taking advantage of their residual surface charge. Laboratory experiments were conducted at static and also in dynamic condition constructing a dual flow loop set-up, equipped with precision pumping, pressure recording and regulated DC power supply. Neat and heptane-diluted crude oil having inherent asphaltene deposition tendencies is used to investigate the influence of DC electrical potential on asphaltene deposition tendencies. Real time deposition trend is interpreted through differential pressure build-up across the flow loops and also through quantitative estimation of deposited mass. The results were encouraging, showing up to 180 % reduction in asphaltene deposition in the cathode loop and about 140 % increase on the anode loop at an optimised potential of 60 V DC. Further, it was observed that higher the n-heptane dilution, higher is the effect of static potential in terms of arresting deposition. Based on these optimistic results, further studies and upscaling are planned (considering the changes of pressure, temperature and fluid composition in an oil well) and looking at the possibilities of controlling asphaltene deposition, by converting the well into a cathode, along with a nearby sacrificing anode well, applying optimum electrical potential.

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Electrokinetic and adsorption properties of asphaltenes

Cited by 121 publications

References 16 publications

Adsorption of asphaltenes from toluene on mineral surface

Adsorption of asphaltenes from toluene on mineral surface

Adsorption of asphaltenes from toluene on typical soils of Lublin region

Dynamic asphaltene deposition control in pipe flow through the application of DC potential

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