Vapor-liquid equilibrium relations of binary systems propane-n-octane and butane-n-octane

Abstract

The P-p-T-x relationships of the propane-n-octane and the n-butane-n-octane systems are determined. The experimental results cover a range from about 150 lb/in.2 abs and room temperature to the highest pressure and temperature at which liquid and vapor can coexist. The data are presented in tabular form. P-T-x, p-T-x, and isobanc T-x diagrams are given.This paper presents the P-p-T-x relationships of the binary systems of propane-n-octane and n-butane-n-octane. It is the third of a series (5, 6) in a study of the effect of the relative size of the molecules on the phase diagram of mixtures of n-alkanes.

Thermodynamic Modeling of the Use of Alkane Mixtures as Working Fluids in Absorption Cycles

“…. The obtained curves show typical shapes, confirming the reliability of the results where the agreement with the corresponding experimental values reported in the literature for the various considered systems is reasonable , .…”

“…The NRTL model is rather of a molecular nature and is based on the local composition concept . It requires molecular interaction parameters, which are determined in the present study from experimental phase equilibria data reported in , by minimizing the objective function F obj defined by means of Eqs. and and expressed by Eq.…”

Critical points of mixtures: An analogy with pure fluids

“…than that given by the rectilinear diameter construction in Figure 8. In Figures 10 and 11 we compare our model for CgH18-CsHg with the data of Kay et al (1974). Even with identically equal to zero, the model provides a very good description of the P-T-x and p-T-x surfaces for the mixtures, with mole fractions of propane less than about 0.8.…”

An improved Helmholtz energy model for non-polar fluids and their mixtures. Part 3: Application to natural gases and related systems

“…Finally, binary interaction parameters were fitted for the interactions nitrogen-oxygen, nitrogen-argon and oxygen-argon though those are of very limited practical interest for natural gas systems because argon is normally not present in natural gas compositions and oxygen is only a trace component in very few natural gas samples. However, the [60] 22 273-348 0.14-2.0 0.10-0.90 (Propane-n-pentane) [61] 97 321-461 1.0-4.5 0.14-0.88 (Propane-n-hexane) [62,63] 226 325-497 0.14-8.7 0.14-0.92 (Propane-n-octane) [64] 89 344-550 0.69-5.8 0.21-0.96 (n-Butane-isobutane) * [65] 16 288-327 0.2-0.7 0.20-0.79 (n-Butane-n-pentane) [66] 66 358-464 1.0-3.6 0.14-0.87 (n-Butane-n-hexane) [66] 68 375-502 0.6-3.9 0.10-0.90 (n-Butane-n-heptane) [67] 74 333-525 0.4-3.9 0.16-0.94 (n-Pentane-n-hexane) [68] 72 298-348 0.1-30 0.12-0.87 (n-Pentane-n-heptane) [ interaction parameters for those three interactions will allow a further test of the mixture model about the prediction of properties of air. It was mentioned in the Introduction that it is possible to form 120 binary interactions with the 16 fluids of this study.…”