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Experimental equilibrium vaporization ratios (K values) were obtained fornitrogen, methane, carbon dioxide, ethane and hydrogen sulfide in two naturalgas-absorber oil mixtures and in two natural gas-Elk Basin crude oil mixtures.For each mixture of constant over-all composition, data were obtained at 100?,150? and 200'F and at various pressures in the range 200 to 5,000 psia. Someeffects of composition on the K values were obtained to serve as a guide inchoosing K's for engineering calculations on other mixtures. The pressure cell used to obtain the data is a new type and is described herefor the first time. Introduction The phase equilibria of complex hydrocarbon mixtures such as natural gases, crude oils and their mixtures have been studied previously for the purpose offinding equilibrium vaporization ratios for the hydrocarbon constituents. In afew cases, such non-hydrocarbons as nitrogen, carbon dioxide, and hydrogensulfide were included in the mixtures studied because they occur in the fluidsobtained from petroleum reservoirs. The increasing occurrence of these non-hydrocarbons and their growingeconomic importance, make it necessary to account for them more accurately inengineering calculations than is now possible using the meager publisheddata. The available data for non-hydrocarbons may be classified into two groups:namely, binary mixtures of a hydrocarbon and a non-hydrocarbon, and mixturescontaining three or more components, only one of which is a non-hydrocarbon.Among the former, phase analyses are available for two nitrogen-HC mixtures, five carbon dioxide-HC mixtures and three hydrogen sulfide-HC mixtures. Datafor more complex mixtures are available as follows: Nitrogen-Methane-Pentane;Nitrogen-Methane-Hexane; Nitrogen-Methane-Heptane; Carbon dioxide-NaturalGas-Natural Gasoline; Carbon dioxide-Natural Gas-Crude Oil. These data have been used generally for engineering calculations, often withlittle regard for their precise applicability because data for thenon-hydrocarbons in the complex mixtures being dealt with were not available.The use of K values from binary data for calculations involving complexmixtures is open to criticism because such K's are not a function ofcomposition and very often show large differences from the K's for the samecomponents in a complex mixture. T.P. 3312

journal of petroleum technology

Equilibrium Vaporization Ratios for Nitrogen, Methane, Carbon Dioxide, Ethane and Hydrogen Sulfide in Absorber Oil-Natural Gas and Crude Oil-Natural Gas Systems