Ternary Gaseous Diffusion Coefficients

C₆H₆-H₂-N₂ System

Abstract

Ternary gaseous diffusion coefficients were measured by using the improved Stefanian diffusion cell or evaporation tube. The experiments were carried out for the benzene-hydrogen-nitrogen system and at temperatures from 30°C to 77°C. The concentration of hydrogen at the top of the tube was varied from 15 mol % to 92 mol %. The observed values agreed well with the theoretical ones calculated by the Stefan-Maxwell equation within experimental error. Furthermore, it became clear that the ternary diffusion coefficients could be estimated by Wilke's equation within an error less than 10% if the logarithmic mean of ratios of concentration at both ends of the diffusion path was used as mean value of ratios of concentration.