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Effect of Monovalent and Divalent Salts on the Interfacial Tension of n-Heptane against Aqueous Anionic Surfactant Solutions
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2017-12-07 , DOI: 10.1021/acs.jced.7b00640 Nilesh Kumar Jha 1, 2 , Stefan Iglauer 2 , Jitendra S. Sangwai 1
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2017-12-07 , DOI: 10.1021/acs.jced.7b00640 Nilesh Kumar Jha 1, 2 , Stefan Iglauer 2 , Jitendra S. Sangwai 1
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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.
中文翻译：
一价盐和二价盐对正庚烷与阴离子表面活性剂水溶液的界面张力的影响
在油相和包含阴离子表面活性剂和盐的浓度非常低的水溶液之间，可以实现非常低的界面张力γ。这种现象在通过低盐度，低表面活性剂提高采收率驱油技术从储层中采收残余油方面可能具有潜在的应用价值。n之间的γ的测量在313.15±0.1 K下，已进行了浓度范围为0.141–2.167 mM的正庚烷和阴离子表面活性剂的水溶液以及浓度范围为9.010–119.780 mM的盐的阴离子表面活性剂的水溶液。实验结果表明，当阴离子表面活性剂[十二烷基硫酸钠（SDS）和磺基琥珀酸二辛酯（AOT）]的浓度增加到最大表面时，在高于Krafft点的温度下，γ值降至最低。在低浓度范围内的一价[氯化钠（NaCl）]和二价[氯化钙（CaCl 2）]盐的存在下，水溶液中浓度过高。要了解并充分捕捉在此类系统中γ的减少，其中n-庚烷作为油相，在此提出了一种简化模型。该模型是Petersen和Saykally模型的扩展，该模型是较早开发以捕获Jones-Ray效果的。
更新日期：2018-06-03
中文翻译：
一价盐和二价盐对正庚烷与阴离子表面活性剂水溶液的界面张力的影响
在油相和包含阴离子表面活性剂和盐的浓度非常低的水溶液之间，可以实现非常低的界面张力γ。这种现象在通过低盐度，低表面活性剂提高采收率驱油技术从储层中采收残余油方面可能具有潜在的应用价值。n之间的γ的测量在313.15±0.1 K下，已进行了浓度范围为0.141–2.167 mM的正庚烷和阴离子表面活性剂的水溶液以及浓度范围为9.010–119.780 mM的盐的阴离子表面活性剂的水溶液。实验结果表明，当阴离子表面活性剂[十二烷基硫酸钠（SDS）和磺基琥珀酸二辛酯（AOT）]的浓度增加到最大表面时，在高于Krafft点的温度下，γ值降至最低。在低浓度范围内的一价[氯化钠（NaCl）]和二价[氯化钙（CaCl 2）]盐的存在下，水溶液中浓度过高。要了解并充分捕捉在此类系统中γ的减少，其中n-庚烷作为油相，在此提出了一种简化模型。该模型是Petersen和Saykally模型的扩展，该模型是较早开发以捕获Jones-Ray效果的。
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