Binary Vapor-liquid Equilibria of Carbon Dioxide-light Hydrocarbons at Low Temperature*

light hydrocarbons at low temperatures is of interest in the design of the proper equipment to make such separations. In the previous paper4) of this series, the equilibrium relationships for two binary mixtures of carbon dioxide with ethylene and ethane at 0°C have been described. Those for the ethylene and ethsine binaries with carbon dioxide have been shown to form, minimum-boiling azeotropes. Wehave therefore extended the work to include mixtures of several hydrocarbons with carbon dioxide. The present paper provides the results of experimental investigations of the equilibria in binary systems of carbon dioxide with four light paraffins, i.e. ethane, propane, ^-butane and isobutane, and with three light olefins, i.e. ethylene, propylene and 1-butene in the low-temperature range (-41.6°C-0°C). Such mixtures are of general interest for two reasons.