Modified entrainment method for measuring vapour pressures and heterogeneous equilibrium constants. Part 3.—Measurement of diffusivity of hydrogen chloride in hydrogen and extension of the method to multicomponent diffusion at 700–1300 K

Abstract

The binary diffusion coefficient of HCl in H₂ may be represented by 0.54(T/273 K)^1.85 cm² S^–1 over the temperature range 700–1300 K. We present a useful second-order approximation to multicomponent diffusion, which permits calculation of effective diffusion coefficients in multicomponent gas mixtures.