The zeta potential and surface properties of asphaltenes obtained with different crude oil/n-heptane proportions☆

Parra-Barraza, Hilda; Hernández-Montiel, Daniel; Lizardi, Jaime; Hernández, Jesús; Urbina, R. Herrera; Váldez, Miguel A.

doi:10.1016/s0016-2361(03)00002-4

Cited by 120 publications

(104 citation statements)

References 21 publications

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“…Parameters such as the nature of the precipitating solvent, the amount of solvent used, the contact time between oil and solvent and the temperature influence the composition of the extracted asphaltenes [1,31,32]. We therefore also studied the behavior of a model oil containing C7 asphaltenes.…”

Section: Comparison Between C5 and C7 Asphaltenesmentioning

confidence: 99%

Influence of pH on Oil-Water Interfacial Tension and Mass Transfer for Asphaltenes Model Oils. Comparison with Crude Oil Behavior

Hutin

Argillier

Langévin

2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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-Asphaltenes are shown to be amphoteric, containing acidic and basic species that can ionize at low and high pH respectively when they come in contact with water. We have used a mass transfer model in order to determine the partition coefficients of asphaltenes between oil and water. We have compared the influence of type of asphaltenes on interfacial tension and on mass transfer between oil and water and analysed the influence of an added surfactant. We have also compared the behavior of asphaltenes dissolved in model solvents with that of diluted heavy crude oils. Although asphaltenes qualitatively reproduce the behavior of crude oil components at the oil-water interface, differences were observed, either in interfacial tensions at low pH, or in partition coefficients at high pH. These differences are due to other molecules present in crude oil, which are either more interfacially active or more soluble in water.Résumé -Influence du pH sur la tension interfaciale et les transferts de masse pour des huiles modèles d'asphaltènes. Comparaison avec le comportement du brut -Nous avons mis en évidence le comportement amphotère des asphaltènes, qui contiennent des espèces acides et basiques pouvant s'ioniser lorsqu'ils entrent en contact avec l'eau. Nous avons utilisé un modèle de transfert de masse afin de déterminer les coefficients de partage des asphaltènes entre l'huile et l'eau. Nous avons comparé l'influence du type d'asphaltènes sur la tension interfaciale et le transfert de masse entre l'eau et l'huile, et analysé l'influence d'un tensio-actif ajouté. Nous avons également comparé le comportement des asphaltènes dissous dans des solvants modèle avec celui d'un brut lourd dilué. Bien que les asphaltènes reproduisent qualitativement le comportement du brut dilué à l'interface huile-eau, des différences sont observées entre les tensions interfaciales à bas pH bas, et dans les coefficients de partage à pH élevé. Ces différences sont dues à d'autres molécules présentes dans le brut, qui sont soit plus interfacialement actives, soit plus solubles dans l'eau.

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Section: Comparison Between C5 and C7 Asphaltenesmentioning

confidence: 99%

Influence of pH on Oil-Water Interfacial Tension and Mass Transfer for Asphaltenes Model Oils. Comparison with Crude Oil Behavior

Hutin

Argillier

Langévin

2016

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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“…The positive surface charge arises upon protonation of basic nitrogen-containing functional groups such as pyridine. Parra-Barraza et al (2003) measured zeta potential of heptane-diluted crude oils and found that at acidic pH asphaltene goes below isoelectric point and becomes positively charged whereas at neutral and higher pH de-protonation occurs resulting negative surface charge. Since the crude oil under present investigation originated in a carbonate reservoir with basic pH environment, it can be assumed that the asphaltenes have exceeded isoelectric point and acquired negative charges.…”

Section: Electro-deposition Behaviour In Dynamic or Flowing Conditionmentioning

confidence: 99%

“…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%

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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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“…There are several ways to generate this effect in aqueous systems due to the counterionic charge effect. The dipolar property of water molecules (H δ+ -OH δ-), which is caused by the angle of 107 0 C between the proton and the hydroxyl ions (Weber, 1972), may be oriented at the interface, thus creating a potential difference (Parra-Barraza et al, 2003, Darekh et al, 2004and Doymus, 2007. Ions or excess electrons in one or both phases give rise to a non-uniform distribution of electric charges at the interface between the phases.…”

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confidence: 99%

Turbidity Removal Efficiency of Clay and a Synthetic af-PACl Polymer of Magnesium Hydroxide in AMD Treatment

Ntwampe¹

2015

ijSciences

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Abstract:In this study five 200 mL acid mine drainage (AMD) samples were treated with 5g clay (bentonite) alone or mixed with 0.1 M Al 3+ in AlCl3 and 0.1 M Mg 2+ in Mg(OH)2 polymer. The AMD samples were poured into five 500 mL glass beakers and dosed with 5 g/L of clay in a jar test, (250 rpm for 2 minutes and reduced to 100 rpm for 10 minutes) and the samples were allowed to settle for 1 hour after which the pH, conductivity, turbidity, dissolved oxygen (DO) and oxidation reduction potential (ORP) were measured. In the next step, 200 mL of the supernatant was poured into five 500 mL glass beakers and dosed with a af-PACl (acid-free polyaluminiumchloride) polymer of 0.1 M Al 3+ in AlCl3, mixed with 0.1 M Mg 2+ in Mg(OH)2, and treated in a similar manner in a jar test, settled for 1 hour, after which similar measurements were conducted, depicted as experiment (A). Another similar set of experiments was conducted, where the AMD sample was dosed with a polymer of 5 g of clay, 0.1 M Al 3+ in AlCl3 and 0.1 M Mg(OH)2 in a jar test. Similar measurements were conducted after 1 hour of settling, depicted as experiment (B). The results showed that the addition of the clay to the AMD sample as a reagent (A) or a polymeric component (B) does not affect the turbidity removal, but the rate of hydrolysis (pH changing pattern) and ORP are affected. The experimental results showed that there is a correlation between the ORP and the pH, and also showed that oxidation takes place during the destabilization-hydrolysis process. The results also showed that the conductivity plays a role during the destabilization-hydrolysis process, i.e. correlation between changing rate of the conductivity and the turbidity.Keywords: mixing, disperse, turbidity, multivalent, pH, turbidity IntroductionConventional wastewater treatment using inorganic coagulants is a common practice because aluminium, one of the reagents utilized in the process is in abundance and has also exhibited desirable effectiveness in the wastewater treatment. On the other hand, the use of polymeric flocculants over inorganic polyelectrolytes, such as poly-aluminium complexes, gives significant advantages when the water has a high concentration of suspended solids; the concentration of the polymeric flocculent is lower, the resulting sludge is more compact and there is less coagulant left in the water after treatment (Stoll, 2013). However polymeric flocculants are not always used in a rational way for optimal flocculation due to the natural fluctuations and heterogeneity of the water composition (e.g., pH, ionic composition), suspended particle concentration and corresponding physicochemical properties (e.g., sizes, shapes, surface charges). The main objective in the present study is to investigate the impact of the polymer which contains clay and Mg(OH)2 with FeCl3 on the destabilization-hydrolysis process for an AMD sample. An improved understanding of the interaction mechanisms between flocculants and the suspended material is also often necessary. Since most of the flocc...

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The zeta potential and surface properties of asphaltenes obtained with different crude oil/n-heptane proportions☆

Cited by 120 publications

References 21 publications

Influence of pH on Oil-Water Interfacial Tension and Mass Transfer for Asphaltenes Model Oils. Comparison with Crude Oil Behavior

Influence of pH on Oil-Water Interfacial Tension and Mass Transfer for Asphaltenes Model Oils. Comparison with Crude Oil Behavior

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

Turbidity Removal Efficiency of Clay and a Synthetic af-PACl Polymer of Magnesium Hydroxide in AMD Treatment

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