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This paper presents the experimental measurements of isobaric vapor–liquid equilibria (iso-p VLE) and excess volumes (vE) at several temperatures in the interval (288.15 to 328.15) K for six binary systems composed of two alkyl (methyl, ethyl) propanoates and three odd carbon alkanes (C5 to C9). The mixing processes were expansive, vE > 0, with (δvE/δT)p > 0, and endothermic. The installation used to measure the iso-p VLE was improved by controlling three of the variables involved in the experimentation with a PC. Experimental iso-101.32 VLE data showed a positive consistency with Fredenslund’s point-to-point method. Systems of methyl propanoate + heptane and ethyl propanoate + heptane presented azeotropes (xaz,Taz) at (0.844, 351.86) and (0.481, 366.61), respectively. Representations were obtained of pvE = φ(x,T) and hE = φ(x,T), using a model proposed previously [Ind. Eng. Chem. Res. 2010, 49, 406], and the behavior of the binary systems studied was interpreted. An adequate extended version of the same ...

journal of chemical and engineering data

Improvements in the Experimentation and the Representation of Thermodynamic Properties (iso-p VLE and yE) of Alkyl Propanoate + Alkane Binaries