Interfacial tension is an important thermophysical property for the operations involving multi fluid-phases such as liquid-liquid extraction. This work aims at presenting a rapid experimental method and initial interfacial tension data of 10 organic compounds and water binary systems. The organic compounds include n-butyl acetate, cyclohexanol, cyclohexanone, diethyl ether, ethyl acetate, methyl ethyl ketone, methylcyclohexane, 1-octanol, and toluene. The effect of temperature on the initial interfacial tension has also been studied. These systems are chosen to cover a wide range of interfacial tension (1-51 mN/m). Comparisons between the data sets from this work and those from the literature, whenever available, show generally very good agreement. This work also presents new data of initial interfacial tension for several ternary systems with 4 organic compounds and water with varying quantities of propionic acid (0 to 0.25 mass fraction) at ambient conditions; the organic compounds include n-butyl acetate, cyclohexanone, 1-octanol, and toluene. The results show that the impact of propionic acid concentration as solute in water is large, especially at the higher solute concentrations. The initial and final (mutually saturated phases) interfacial tensions are found in agreement for different immiscible binary systems studied in this work. The method presented may be used as a rapid way of finding interfacial tensions.

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The experimental data of six different types of Pt-containing alumina catalysts are used to study the detailed and rigorous kinetics of the methylcyclohexane dehydrogenation reaction. A large number of kinetic rate equations were formulated using the power law kinetics and the Langmuir-Hinshelwood-Hougen-Watson (LHHW) kinetics, which were tested against the experimental data. For each catalyst, the elementary reaction step "the loss of first molecular hydrogen" in the LHHW single-site surface reaction mechanism was observed to be the rate-determining step. The form of the kinetic rate model developed in the study is believed to be applicable to any Pt-loaded alumina catalyst. K E Y W O R D Sdehydrogenation, Langmuir-Hinshelwood-Hougen-Watson kinetics, methylcyclohexane, organic hydride, Pt catalystInt J Chem Kinet. 2020;52:415-449.

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