Gaseous Diffusion Coefficients of Propane and Propylene into Air, Nitrogen and Oxygen

Abstract

The gaseous diffusion coefficients of propane (C₃H₈) and propylene (propene, C₃H₈) into air, nitrogen and oxygen have been measured in the temperature range 303∼453 K and at atmospheric pressure by the use of the Taylor dispersion method. Both for propane and propylene, the diffusion coefficients do not vary in practice on substituting pure nitrogen or oxygen for air. The diffusion coefficients for propylene are systematically larger than those for propane by about 3%. The present results can be reproduced well by the functional form D/cm²s⁻¹=A(T/K)^B, where D is the diffusion coefficient at 101.325 kPa (1 atm)and T is the absolute temperature. The constants A and B are as follows: propane-(air, nitrogen, oxygen), A= 4.65×10⁻⁶, B= 1.77; propylene-(air, nitrogen, oxygen), A= 5.08×10⁻⁶, B= 1.76.