THERMODYNAMIC PROPERTIES OF NATURAL-GAS, PETROLEUM GAS AND RELATED MIXTURES .1. MIXED FLUID DENSITIES

Description of a method for very accurate correlation of mixed fluid densities of natural gas, petroleum gas and related mixtures, including low molecular weight hydrocarbons, nitrogen, carbon dioxide, carbon monoxide and hydrogen sulfide. The method is applicable for mixed fluid densities both on and off the saturation surface. The method is based on a statistical mechanical formulation of the principle of corresponding states using methane as the reference fluid. The overall agreement with known experimental densities is 0. 1% for LNG and 0. 2% for LPG.