VAPOR-LIQUID-EQUILIBRIA OF BINARY-MIXTURES OF BETA-PINENE WITH LIMONENE AND P-CYMENE AT ATMOSPHERIC-PRESSURE

Vapor-liquid equilibrium data for the binary systems beta-pinene + lim onene and beta-pinene + pq-cymene were determined at atmospheric press ure in an Othmer equilibrium still. Vapor pressures of pure components were measured and the data correlated with the Antoine equation. Para meters for the Van-Laar, Margules, Wilson, NRTL and UNIQUAC equations were calculated with the aid of a Nelder - Mead technique to minimize an objective function based on the total pressure. Predictions with th e UNIFAC method were also obtained.