Properties of surfactant/oil/water emulsified systems in the neighborhood of the three-phase transition

Salager, Jean-Louis; Quintero, Lirio; Ramos, Ennodio; Andérez, J. M.

doi:10.1016/0021-9797(80)90447-6

Cited by 90 publications

(59 citation statements)

References 5 publications

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“…For a CO 2 -philic surfactant, where 1/HCB > 1, the surfactant partitions more towards the CO 2 phase and bends about water, forming a W/C emulsion, as shown in Fig. 1 [43,46]. When 1/HCB < 1, the surfactant prefers the aqueous phase and the interface is concave with respect to CO 2 , resulting in a C/W emulsion [27,47,48].…”

Section: Theorymentioning

confidence: 90%

Effect of branching on the interfacial properties of nonionic hydrocarbon surfactants at the air–water and carbon dioxide–water interfaces

Adkins

Chen

Nguyen

et al. 2010

Journal of Colloid and Interface Science

121

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Section: Theorymentioning

confidence: 90%

Effect of branching on the interfacial properties of nonionic hydrocarbon surfactants at the air–water and carbon dioxide–water interfaces

Adkins

Chen

Nguyen

et al. 2010

Journal of Colloid and Interface Science

121

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“…It has been known for over 40 years that emulsion stability is extremely low when the interactions of the interfacially adsorbed surfactant or surfactant mixture are exactly equal for oil and water [14][15][16][17][18][19] .…”

Section: Emulsion (In)stability : Formulation Main Influence and Secomentioning

confidence: 99%

Breaking of Water-in-Crude Oil Emulsions. 6. Estimating the Demulsifier Performance at Optimum Formulation from Both the Required Dose and the Attained Instability

et al. 2016

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Hydrophilic surfactant molecules with the proper formulation are able to break W/O emulsions stabilized by asphaltenes and other lipophilic amphiphiles as found in the effluent of petroleum wells. The demulsifier performance is here tested according to two critera. The first one, as in previous research, is the minimum dose of demulsifier used to attain the minimum stability at the so-called optimum formulation in a simplified bottle test. The second criterion is the value of this minimum stability at optimum formulation that has a direct relation with the separation time. Our findings show that in a family of ethoxylated surfactants, the best demulsifier is a hydrophilic one, though not too much. When the demulsifier is a mixture of two surfactants, it usually exhibits an intermediate behavior between the components. However, the mixture sometimes appears to be better than any of the components alone with some synergistic effect that improves the performance.

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“…(Johnston & Da Rocha, 2009) For a CO 2 -philic surfactant, for which 1/HCB > 1, the surfactant partitions more towards the CO 2 phase and causes the CO 2 -water interface to bend about water, forming a W/C microemulsion or macroemulsion, as shown in Figure 1. (Aveyard et al, 1990, Eastoe et al, 1994, Salager & Quintero, 1980) When 1/HCB < 1, the surfactant prefers the aqueous phase and the interface is concave with respect to CO 2 , resulting in a C/W macro-or microemulsion. , Dhanuka et al, 2006, Lee et al, 1999 The emulsion undergoes a phase inversion at the balanced state when HCB= 1, when the surfactant exhibits an equal affinity for both phases.…”

Section: As Defined In Equationmentioning

confidence: 99%

Switchable Amine Surfactants for Stable CO2/Brine Foams in High Temperature, High Salinity Reservoirs

Elhag

Chen

et al. 2014

SPE Improved Oil Recovery Symposium

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Ethoxylated amine surfactants of the form C 12-14 N(EO) x have been characterized for foam generation to improve the sweep efficiency for CO 2 enhanced oil recovery (EOR) up to 120 °C in the presence of high salinity brine of 22%TDS. These surfactants are switchable from the nonionic (unprotonated amine) state in dry CO 2 to cationic (protonated amine) in the presence of an aqueous phase with a pH below 6. Potentiometric titration of two surfactants with 2 or 15 EO groups was conducted at 90 °C to test the switchability of the surfactant from nonionic to cationic forms at different pH values.Ethoxylated amine with 2 EO groups showed more affinity for protonation when compared to 15 EO due to the hinderance effect of the larger molecule that covers the ionizable nitrogen head. For C 12-14 N(EO) 2 , viscous C/W foams were produced by injecting the surfactant either in the CO 2 phase or the brine phase, which indicates good surfactant transport to the interface in either case. The optimum foam quality was observed at 90% and 95% when the surfactant was injected from brine phase or CO 2 phase, respectively. C 12-14 N(EO) 2 was effective in lowering the interfacial tension between water and CO 2 at 120 °C and 22%TDS from ~ 40 mN/m to 5 mN/m with CMC value of 0.038 mM. This significant reduction in interfacial tension enhances foam generation and foam stability.

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Properties of surfactant/oil/water emulsified systems in the neighborhood of the three-phase transition

Cited by 90 publications

References 5 publications

Effect of branching on the interfacial properties of nonionic hydrocarbon surfactants at the air–water and carbon dioxide–water interfaces

Effect of branching on the interfacial properties of nonionic hydrocarbon surfactants at the air–water and carbon dioxide–water interfaces

Breaking of Water-in-Crude Oil Emulsions. 6. Estimating the Demulsifier Performance at Optimum Formulation from Both the Required Dose and the Attained Instability

Switchable Amine Surfactants for Stable CO2/Brine Foams in High Temperature, High Salinity Reservoirs

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