The Formation of Middle‐Phase Microemulsions of Polar Oils

Nishimi, Taisei

doi:10.1002/masy.200851006

Cited by 9 publications

(4 citation statements)

References 17 publications

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“…Winsor III microemulsions are characterized by the coexistence of oil and water phases at a quasi-molecular scale, in nanodomains of typically 5 to 50 nm (Salager et al, 2001). In this case, oil and water phases mix themselves spontaneously without any external energy supply (Nishimi, 2008). Thus, the obtained homogeneous and transparent system is thermodynamically stable.…”

Section: Formulation Methodsmentioning

confidence: 90%

Extended surfactants and their tailored applications for vegetable oils extraction: An overview

Gagnon

Mhemdi

Delbecq

et al. 2021

OCL

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The vegetable oil extraction process from seeds and nuts depends on mechanical and solvent (usually n-hexane) extractions. Despite the efficiency of n-hexane, its use is nowadays questioned due to health, environmental, and technological issues. As an alternative to hexane extraction, several greener solvents and extraction techniques have been developed and tested during the last decades. Among these alternatives, the Surfactant-Aqueous Extraction Process (SAEP) appears as a promising method. Initially developed for the petroleum sector, this method was then tested and optimized for vegetable oil extraction. Successful implementations at the laboratory scale led to slightly more than 90% oil yield, mainly by using so-called “extended surfactants”. Compare to conventional surfactants, these surfactants can efficiently solubilize a large amount of vegetable oil in water, despite the structural diversity and the bulkiness of vegetable oil molecules. The present review is devoted to extended surfactant applications to SAEP. This review summarizes and discusses the main findings related to the extended surfactant structures and properties, as well as the main experimental results on the SAEP, and the advantages and the current limitations towards a scaling-up of this promising process.

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Section: Formulation Methodsmentioning

confidence: 90%

Extended surfactants and their tailored applications for vegetable oils extraction: An overview

Gagnon

Mhemdi

Delbecq

et al. 2021

OCL

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“…The addition of more surfactant ([0.5 wt%) to the system, causes the drastic increase of the IFT. This sudden upsurge in the IFT of the system is explained by the formation of a microemulsion Winsor Type II or reverse micelle (water in oil microemulsion) [40]. As the surfactant concentration increases, there is a rapid inversion of the distribution of the hydrophobic and hydrophilic portions of the surfactant between oil and water, which results in the formation of a water in oil emulsion [41].…”

Section: Interfacial Tension Measurementsmentioning

confidence: 99%

Complexation of Surfactant/β‐Cyclodextrin to Inhibit Surfactant Adsorption onto Sand, Kaolin, and Shale for Applications in Enhanced Oil Recovery Processes. Part III: Oil Displacement Evaluation

Kittisrisawai

Romero‐Zerón

2015

J Surfact & Detergents

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This proof of concept research evaluates the performance of a surfactant/b-cyclodextrin (b-CD) inclusion complex during chemical flooding for enhanced oil recovery. It was hypothesized that the encapsulated surfactant propagates well through the porous media. Sodium dodecyl sulfate (SDS) was used to study the surfactant/b-CD complexations. Phase behavior analysis was carried out to prepare the most favorable chemical slug formulation. A series of core flooding tests were conducted to determine the efficiency of the SDS/b-CD inclusion complex in displacing residual oil. Surfactant flooding was conducted as tertiary oil recovery mode (after mature water flooding) by injecting 0.3 pore volume (PV) of the optimum surfactant slug that was chased by 0.3 PV of a polymer slug; followed by continuous water flooding until oil production stopped. The experimental results indicate that the encapsulated surfactant propagates well through the sandpack system and consistently produces higher incremental oil recoveries that range from 40 to 82 % over the incremental oil recovery achieved by conventional surfactant flooding. KeywordsSurfactant delivery system Á Surfactant carrier system Á Surfactant/b-cyclodextrin complexation Á Surfactant/b-cyclodextrin inclusion complexes Á Surfactant adsorption Á Surfactant adsorption inhibition Á Surfactant flooding Á Enhanced oil recovery Á Surfactant encapsulation in b-cyclodextrin List of symbols k Permeability in md (millidarcy) S or Residual oil saturation in fraction t Time uFlux in cm/h V sm Surfactant volume in the microemulsion phase V wm Water volume in the microemulsion phase V om Oil volume in the microemulsion phase r mw Interfacial tension (IFT) between the microemulsion/water phases r mo Interfacial tension (IFT) between the microemulsion/oil phases / Porosity

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“…The phase behavior of water/oil/surfactant systems and the basic principles of low-energy emulsification was reported by Nishimi [39].…”

Section: Introduction 1 2 State Of the Artmentioning

confidence: 91%

Assessment of a surfactant- polymer formulation for conditions in a Colombian field

Hernández

Moreno

2019

CT&F Cienc. Tecnol. Futuro

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The surfactant-polymer (SP) process is one of the Chemical Enhanced Oil Recovery (CEOR) methods used in the industry. It has been continuously studied; however, it is still a challenge for the petroleum industry due to the difficulty to design the solution to be injected and forecast process performance. This paper is intended to contribute to the design of fluids used in an SP process based on some previously known properties and conditions. Hence, reservoir and fluid properties of a Colombian Field were used as reference parameters to select the polymer and surfactant. Then, the effects of salts, temperature, and surfactant on tailor-made polymer solutions were determined through a rheological study. Ostwald-de Waele and Carreau-Yasuda models adjusted the measured viscosity data against shear rate, while Arrhenius equation fitted viscosity values at 7,8 s-1 against temperature. The surfactant performance was analyzed using phase behavior tests, and the Chun Huh equations determined the interfacial tension (IFT) values. The Bancroft’s rule was used as a qualitative verification tool of the kind of micro- emulsion formed. From rheology, we concluded that the viscous modulus is predominant for all polymer solutions, and the fluid thickness is reduced due to the presence of divalent cations and raise on temperature, salts or surfactant concentration. On the other hand, the observed phase behavior corresponded to a transition Winsor II to I without finding any Winsor III micro-emulsion. Therefore, some criteria were proposed to select the optimal conditions. For the desired conditions, the reduction of IFT reached values ranging in magnitudes of 10-3 to 10-4 [mN/m]. These values are usually associated with an improved oil recovery factor.

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The Formation of Middle‐Phase Microemulsions of Polar Oils

Cited by 9 publications

References 17 publications

Extended surfactants and their tailored applications for vegetable oils extraction: An overview

Extended surfactants and their tailored applications for vegetable oils extraction: An overview

Complexation of Surfactant/β‐Cyclodextrin to Inhibit Surfactant Adsorption onto Sand, Kaolin, and Shale for Applications in Enhanced Oil Recovery Processes. Part III: Oil Displacement Evaluation

Assessment of a surfactant- polymer formulation for conditions in a Colombian field

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