PHASE-EQUILIBRIUM MEASUREMENTS ON 12 BINARY-MIXTURES

Phase equilibrium measurements have been performed on twelve binary mi xtures. The PTx method was used to obtain vapor-liquid equilibrium dat a for the following binary systems at two temperatures each: ethanethi ol + propylene; nitrobenzene + methanol; pyridine + ethyl acetate; oct ane + tert-amyl methyl ether; diisopropyl ether + butane; 1,3-dichloro -2-propanol + epichlorohydrin; 2,3-dichloro-1-propanol + epichlorohydr in; 2,3-epoxy-1-propanol + epichlorohydrin; 3-chloro-1,2-propanediol epichlorohydrin; methanol + hydrogen cyanide. For these systems, equi librium vapor and liquid phase compositions were derived from the PTx data using the Soave equation of state to represent the vapor phase an d the Wilson, NRTL, or Redlich-Kister activity coefficient model to re present the liquid phase. The infinite dilution activity coefficient o f methylamine in N-methyl-2-pyrrolidone was determined at three temper atures by performing PTx measurements on the N-methyl-2-pyrrolidone-ri ch half of the binary. Liquid-liquid equilibrium studies were made on the triethylene glycol + 1-pentene system at two temperatures by direc tly analyzing samples taken from each liquid phase.