The dehydration of tert-butyl alcohol to water and isobutene was studied using an ion-exchange resin catalyst at temperatures between 60 and 90 °C. A temperature-dependent equilibrium constant for the dehydration reaction was obtained that gave a reaction enthalpy of 26 kJ mol -1 , in good agreement with values in the literature. Measured data were used for kinetic modeling of the reaction. The best model with physically meaningful parameters was of Langmuir-Hinshelwood type where isobutene does not adsorb on the catalyst. The activation energy for the reaction in this case was 18 kJ mol -1 .

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Vapor-liquid equilibria measured with a static apparatus are reported for binary mixtures of 2-methylpropene and the following C1-C4 alcohols at the corresponding temperatures: methanol (323.15 K), ethanol (323.15 K), 2-propanol (323.15 K), 2-butanol (323.15 K), and 2-methyl-2-propanol (313.15 K and 322.77 K). Measured pTz (pressure-temperature-total composition) data were reduced to liquid-and vapor-phase compositions using Barker's method. Binary interaction parameters were optimized for the Legendre polynomial, Wilson, UNIQUAC, and nonrandom two-liquid methods. An error analysis for all measured results was performed. All systems indicated a positive deviation from Raoult's law. Azeotropic behavior was observed for 2-methyl propene + methanol binary.

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