P–ρ–T Data and Modeling for Butan-1-ol + n-Octane or n-Decane between 313.15–353.15 K and 0.1–20 MPa

Abstract

Density measurements conducted for the binary systems of butan-1-ol (1) + n-octane (2) and butan-1-ol (1) + n-decane (2) at high pressures are presented in this work. These measurements were conducted utilizing an Anton Paar DMA HP densitometer and encompass the entire composition range, with a temperature and pressure range of T = (313.15–353.15 K) and P = (0.1–20 MPa), respectively. The modified Toscani–Szwarc equation of state was employed to successfully correlate the experimental density data. The measured data were observed to comply with general expected trends with regards to the relationship between density, temperature, and pressure. Derived thermodynamic properties, namely, excess molar volumes, thermal expansivity, and isothermal compressibility, are also presented. Deviations from ideality are attributed to differing molecule sizes and shapes as well as intermolecular interactions between components constituting the mixture.

P–ρ–T Data for Propan-2-ol + n-Octane or n-Decane in the Ranges of 303.15–353.15 K and 0.1–20 MPa

“…In this work, the empirical modified Toscani–Szwarc equation of state (MTS EOS) proposed by Quevedo-Nolasco et al as a variation of the Toscani–Szwarc equation of state was used to correlate the experimental density data, as previous studies have shown its effectiveness in correlating alcohol–alkane high-pressure density data. − , Tait-type (9 parameters) and BWRS EOS (11 parameters) density models were also considered initially. In the majority of cases, the improvement of fit by these models was not significant based on F -test calculations.…”

“…The apparatus used for the high-pressure density measurements was described in previous work by Moodley and co-workers − , and is shown in Figure .…”

“…A device uncertainty of 0.01 K was stated by the supplier for temperature. In recent previous work, a series of pure species density measurements were conducted using the same device to confirm the temperature uncertainty of the device in situ. The WIKA P-10 transducer was calibrated in this work using a Mensor standard model CPC6000 with the reference fluid being pure nitrogen gas.…”

“…The issue of poor liquid density prediction/correlation is compounded in mixtures, where complex mixture behavior (due to excess molar volume) must be further accounted for by the models, such as in alcohol–alkane mixtures. − …”

“…In previous studies, our research group has reported the density/excess molar volume behaviors of C3–C4 alcohols with C8–C10 alkanes as functions of temperature and pressure; ,,, however, similar mixtures incorporating propan-2-ol have not been studied to date. This data is essential to characterize the effect of alcohol chain length and isomeric structure on the density and excess molar volume of these alcohols with C8–C10 alkanes and will also find use in model development.…”