Partitioning of Ethoxylated Octylphenol Surfactants in Microemulsion−Oil−Water Systems:  Influence of Temperature and Relation between Partitioning Coefficient and Physicochemical Formulation

Salager, Jean-Louis; Márquez, Nelson; Graciaa, A.; Lachaise, J.

doi:10.1021/la9905517

Cited by 277 publications

(313 citation statements)

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“…The partitioning results of pure BAC surfactants, C 12 , C 14 , and C 16 , in water-oil partitioning are shown in Fig. 2a.…”

Section: Resultsmentioning

confidence: 99%

“…• C are 0.041 for C 12 , 0.598 for C 14 , and 8.802 for C 16 , respectively. The equilibrium concentration of pure surfactant in aqueous phase increases linearly with the initial concentration up to around the aqueous cmc, which is consistent with y = 5x10 6 previous reports.…”

Section: Resultsmentioning

confidence: 99%

“…The homologous cationic benzalkonium chlorides (BAC) surfactants, including benzyl dimethyl dodecyl ammonium chloride (C12 or C 12 ), benzyl dimethyl tetradecyl ammonium chloride (C14 or C 14 ), and benzyl dimethyl hexadecyl ammonium chloride (C16 or C 16 ), and polyoxyethylene n-cetyl ether (C n E n ) were supplied by Sigma-Aldrich Co. LLC with assay values higher than 99%. Primary alcohol ethoxylate (C 12 OE n ) was provided by Witco Corporation.…”

Section: Methodsmentioning

confidence: 99%

“…z E-mail: yakun.zhu@utah.edu; ykzhu1@hotmail.com hydrophobic-hydrophilic balance 13,14,16,17 and is critical for the evaluation of corrosion inhibition efficiency of surfactants. 4 For pure surfactant, the partitioning is usually characterized by the partitioning coefficient, which is defined as the ratio of monomeric surfactant concentration in oil to that in aqueous phase.…”

mentioning

confidence: 99%

“…The surfactant distribution model, which is a combination of a partitioning sub-model, a partitioning coefficient calculation method, and the developed cmc prediction sub-model based on previous work, 34,35 provides a potential tool to evaluate the partitioning of surfactant mixtures in water-oil environments. The developed water-oil surfactant distribution model is validated using experimental data of pure and mixed benzalkonium chloride (C 12 , C 14 , and C 16 ) surfactants in water (containing salt)-oil (toluene) environments. The effects of surfactant concentration, experimental temperature, and bulk mixed molar ratio of surfactants are investigated.…”

mentioning

confidence: 99%

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Experimental Investigation and Modeling of the Performance of Pure and Mixed Surfactant Inhibitors: Partitioning and Distribution in Water-Oil Environments

Zhu

Free

2015

J. Electrochem. Soc.

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A critical model of water-oil surfactant distribution has been developed and validated for the evaluation of mixed surfactant partitioning and distribution in water-oil environments. The surfactant distribution model, which is a combination of surfactant partitioning sub-model, partitioning coefficient calculation method, and a developed critical micelle concentration (cmc) prediction sub-model based on previous work, provides a very powerful tool to evaluate the partitioning of mixed surfactants in water-oil environments. Different methods to calculate partitioning coefficients are introduced, which includes transfer free energy method and group contribution method. The partitioning data from model prediction and from experiment agree very well. The mixed micelles start to form in water-oil environments only after the apparent cmc is reached during partitioning. The selective partitioning of one particular surfactant in mixed surfactants can be explained by its apparent cmc which is interpreted as one characteristic of the hydrophobicity/hydrophilicity of that surfactant in water-oil environments. It is believed that the partitioning and distribution of non-homologous mixed surfactants in oil-water environments are evaluated theoretically and experimentally for the first time. The effect of partitioning on corrosion inhibition of mixed surfactants was initially evaluated by modified Langmuir adsorption and by electrochemical measurements. The corrosion inhibition efficiency from model prediction and from experimental measurements is comparable. The use of surfactant inhibitors has received extensive attention in the oil and gas industry for corrosion inhibition of production and transportation pipes (metallic materials, such as steel and copper) in a way that surfactant molecules usually adsorb on steel surface and form a protective film which acts as a barrier to prevent corrosive media penetration and attack. [1][2][3][4] Compared to the production and use of pure surfactants, surfactant mixtures are well known due to the superior physicochemical properties and capabilities in efficient solubilization, adsorption, suspension, and transportation. [5][6][7][8] The solutions of surfactant mixtures can often be conveniently tuned to achieve desired properties by adjusting the mixed surfactant types and molar ratios. More surface-active and expensive surfactants are often mixed with less surface-active and cheaper surfactants to reduce cost.9,10 Natural mixtures of surfactants are sometimes used to avoid the investment in separation processes. However, further studies are required in order to optimize inhibition efficiency of surfactant mixtures and minimize environmental impact.Surfactant molecules have hydrophilic and hydrophobic sections, 7,11,12 which are critical to the adsorption on metal surface and associated corrosion inhibition.2-4 The hydrophilic functional group of surfactant molecules strongly prefers interaction with polar entities such as metals, which is helpful in corrosion inhibition. The hydroph...

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“…The partitioning results of pure BAC surfactants, C 12 , C 14 , and C 16 , in water-oil partitioning are shown in Fig. 2a.…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%