LIQUID LIQUID VAPOR-PHASE EQUILIBRIUM BEHAVIOR OF CERTAIN BINARY ETHANE + N-ALKANOL MIXTURES

Liquid-liquid-vapor (LLV) loci for the binary mixtures ethane + n-propanol, ethane + n-butanol, ethane + n-octanol and ethane + n-decanol are studied experimentally using a visual cell (stoichiometric) technique. The pressure, temperature, phase compositions and molar volumes of the two liquid phases are reported for all the mixtures. The vapor phase compositions and molar volumes of the mixtures ethane + n-propanol and ethane + n-butanol are also reported. LLV locus end points are reported for all the ethane + n-alkanol mixtures from ethanol to n-pentadecanol. A transition in the nature of the LLV locus occurs in the homologous series between n-decanol and n-undecanol. For n-undecanol and higher n-alkanols, the lower terminus of the LLV locus is a four-phase solid-liquid-liquid-vapor (SLLV) point, with the termination of LLV immiscibility occurring with n-pentadecanol. For n-decanol and lower n-alkanols to ethanol, the lower terminus is a lower critical end point, with the two liquid phases being critical. © 1990.