Transport processes in binary and ternary mixtures containing water, triethylamine and urea. Part 2.—Mutual diffusion coefficients in the triethylamine + water system at 5 and 15°C

Abstract

Mutual diffusion coefficients have been measured over the whole composition range by Gouy interferometry at 5 and 15°C. Attempts to measure the four mutual diffusion coefficients characteristic of the ternary system triethylamine + water + urea were not successful because of experimental problems associated with these mixtures. Data on the binary system have been combined with accurate activity data, and with intradiffusion coefficients to obtain frictional coefficients. These show a very marked concentration dependence of a type which suggests that each component is surrounded preferentially by molecules of the same species, that is, that extensive clustering occurs. This is consistent with a system showing a lower consolute temperature.