The viscosity and diffusion coefficients of the mixtures of four light hydrocarbon gases

The paper reports on new, accurate (±0.3%) measurements of the viscosity of binary and multicomponent mixtures involving the four saturated hydrocarbons: CH₄, C₂H₆, C₃H₈ and C₄H₁₀. Measurements were restricted to atmospheric pressure and the temperature range 25-195°C. The measurements confirm that the pure components conform to the extended law of corresponding states of Kestin, Ro and Wakeham and prove that the same is true about their mixtures. Measurements on the binary mixtures serve to determine the scaling factors σ₁₂ and ε{lunate}₁₂ for binary interactions, and measurements on multicomponent mixtures confirm the continued validity of the extended law of corresponding states for these complex molecules. The measurements yield values of the binary diffusion coefficients of the six pairs. The binary diffusion coefficients for C₂H₆-n·C₄H₁₀ and C₃H₈-n·C₄H₁₀ do not seem to have been measured before.