Fluid Phase Equilibria, 1991, Vol.64, pp.263-280
The P , ϱ, T behaviour of three ethane + nitrogen mixtures (0.7515 C 2 H 6 , 0.5004 C 2 H 6 and 0.2503 C 2 H 6 ) was determined from P , n , T measurements for the isotherms 270, 290, 310, 330 and 350 K and for pressures up to 28 MPa. The refractive index n and the pressure P of the mixtures were measured with two coupled laser interferometers. The experimental P , n , N data were combined with the higher-order refractivity virial coefficients B R and C R of the Lorentz—Lorenz expansion to calculate the density ϱ. The experimental results were used to obtain tables of compressibility factors for each mixture. The P , ϱ, T data were reduced to obtain the second and third virial coefficients, B and C , for each mixture. Unlike interaction virial coefficients, B 12 , C 112 and C 122 , were determined from the mixture virial coefficients by using the like interaction virial coefficients of the pure components from Jaeschke and Hinze. The compressibility factors are considered accurate to 0.1%, and unlike interaction second virial coefficients to ±1.5 cm 3 mol −1 . The values agree excellently with the B 12 results determined from the P , ϱ, T data of Reintsema et al. and the value at 311 K from Calvin and Reed.
Engineering ; Chemistry
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