To supply the data needed to perform reliable design calculations with petroleum reservoir fluids or natural gas systems, the University of Alberta determined the vapor and liquid equilibrium-phase compositions at 50.0/sup 0/, 1.1/sup 0/, and -49.3/sup 0/F for the carbon dioxide-n-butane system and at -49.3/sup 0/ and -99.4/sup 0/F for the nitrogen-hydrogen sulfide system. The data for the 50.0/sup 0/F isotherm for the carbon dioxide-n-butane system were taken in a variable-volume cell, and the remaining data in a constant-volume cell designed for operation at low temperatures. Refractive index measurements of the equilibrium phases were made for the carbon dioxide-n-butane system at 50.0/sup 0/ and 1.1/sup 0/F. These measurements were used to determine phase densities by the use of the Lorentz-Lorenz molar refractivity relationship.
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