The density dependence of self-diffusion in some simple amines

Self-diffusion coefficients for monomethylamine and trimethylamine are given, taken in the temperature range between the melting pressure curve and 423 K at pressures up to 200 MPa. In the same T,p-range intradiffusion coefficients for an equimolar mixture of trimethylamine and ammonia were measured. For the evaluation of the diffusion data the densities of trimethylamine were determined between 273 and 373 K up to 200 MPa. These data permit the description of diffusion in this fluid by the rough hard sphere (RHS) model. The result of the data analysis of all systems studied under inclusion of the previously investigated ammonia is that hydrogen bonding has no influence upon the dynamics in any of these systems.