VOLUME EXPANSIONS AND VAPOR-LIQUID-EQUILIBRIA OF BINARY-MIXTURES OF AVARIETY OF POLAR-SOLVENTS AND CERTAIN NEAR-CRITICAL SOLVENTS

Vapor-liquid equilibria for binary mixtures of polar solvents with eit her carbon dioxide, ethane, or ethene were determined with a newly des igned apparatus. Bubble-point curves were determined for three differe nt temperatures. The densities of the liquid phases were also obtained . From these data the volume expansions of the liquid phases were calc ulated. The results show large differences in the volume expansions, d epending on the binary system investigated. The binary systems with ca rbon dioxide show an interesting density behavior, which has no equiva lent in the ethane or ethene systems. The bubble-point curves were mod eled with the Peng-Robinson equation of state (EOS).