Isothermal Binary Vapor−Liquid Equilibrium for 2-Methylpropane and n-Butane with 1,2-Ethanedithiol and 2-Methyl-2-propanethiol

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Isothermal vapor−liquid equilibrium was measured for 2-methylpropane + 1,2-ethanedithiol, 2-methylpropane + 2-methyl-2-propanethiol, n -butane + 1,2-ethanedithiol, and n -butane + 2-methyl-2-propanethiol at 346.97 K with a static total pressure apparatus. The measured data were reduced with Barker’s method to obtain phase equilibrium data. The Legendre polynomial, Wilson, NRTL, UNIQUAC, UNIFAC, and Cosmo-SAC activity coefficients in infinite dilution and possible model parameters were reported. All binary data showed a positive deviation from Raoult’s law.