The effect of temperature on the interfacial tension between crude oil and ethoxylated nonylphenols |
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| Authors: | Amir Mosayebi Parissa Khadiv-Parsi |
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| Affiliation: | 1. Department of Chemical Engineering, Tafresh University, Tafresh, Iran;2. School of Chemical Engineering, College of Engineering, University of Tehran, Tehran, Iran |
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| Abstract: | In this study, the effect of temperature on interfacial tension between crude oil and ethoxylated nonylphenols, with ethoxy group numbers of 4 and 9, was investigated. The interfacial tension was measured using the rising drop technique. Above the critical micelle concentration, the interfacial tension passed through a minimum when the temperature increased. Below the critical micelle concentration, the interfacial tension and time needed to reach equilibrium interfacial tension was reduced when the temperature increased. For a mixture of a two-surfactant system, interfacial tension was not sensitive to the temperature because of formation of mixed micellar aggregates. |
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| Keywords: | Critial micelle concentration emulsion interface interfacial tension surfactant |
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