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Effect of Monovalent and Divalent Salts on the Interfacial Tension of n -Heptane against Aqueous Anionic Surfactant Solutions
Nilesh Kumar Jha, Stefan Iglauer,
Published in American Chemical Society
2018
Volume: 63
   
Issue: 7
Pages: 2341 - 2350
Abstract
A very low interfacial tension, γ, can be achieved between an oil phase and an aqueous solution containing anionic surfactant and salt at a very low concentration. This phenomenon can have potential applications in recovering residual oil from the reservoir through low salinity-low surfactant enhanced oil recovery flooding. Measurements of γ between n-heptane and aqueous solution of anionic surfactants in the concentration range of 0.141-2.167 mM and salts in the concentration range of 9.010-119.780 mM at 313.15 ± 0.1 K have been carried out. The experimental results show that the value of γ falls to a lowest value at a temperature above the Krafft point when the concentration of anionic surfactants [sodium dodecyl sulfate (SDS) and dioctyl sulfosuccinate sodium salt (AOT)] is increased up to a maximum surface excess concentration in an aqueous solution in the presence of monovalent [sodium chloride, (NaCl)] and divalent [calcium chloride, (CaCl2)] salts in the low concentration range. To understand and adequately capture the reduction of γ in such systems with n-heptane as an oil phase, a simplistic model is being proposed here. This model is an extension of the Petersen and Saykally model which was earlier developed to capture the Jones-Ray effect. © 2017 American Chemical Society.
About the journal
JournalData powered by TypesetJournal of Chemical and Engineering Data
PublisherData powered by TypesetAmerican Chemical Society
Open AccessNo
Concepts (20)
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    Biophysics
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    Calcium chloride
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    Enhanced recovery
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    Heptane
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    Oil well flooding
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    PETROLEUM RESERVOIR ENGINEERING
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    Reservoirs (water)
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    Sodium chloride
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    Sodium dodecyl sulfate
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    Solutions
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    SULFUR COMPOUNDS
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    Concentration ranges
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    DIOCTYL SULFOSUCCINATE SODIUM SALTS
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    ENHANCED OIL RECOVERY
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    KRAFFT POINTS
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    Low concentrations
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    MAXIMUM SURFACE EXCESS CONCENTRATION
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    Measurements of
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    SURFACTANT SOLUTION
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    Solution mining