Experimental measurements and prediction of liquid densities for n-alkane mixtures

Ramos-Estrada, Mariana; Iglesias‐Silva, Gustavo A.; Hall, Kenneth R.

doi:10.1016/j.jct.2005.05.020

Cited by 39 publications

(24 citation statements)

References 53 publications

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“…The effect of temperature on the excess volume is widely accepted and has been studied in great detail. Some data for alkane- and alcohol-containing systems are available in the literature. − Additionally, numerous pure-component n -octane, n -nonane, n -decane, and propan-1-ol densities have been reported as functions of temperature and pressure in the literature. − However, the pressure effect on the excess volume is not well studied for the binary propanol–alkane systems considered here.…”

Section: Introductionmentioning

confidence: 99%

P–ρ–T Data and Modeling for Propan-1-ol + n-Octane or n-Nonane or n-Decane from 313.15 K to 363.15 K and 1 MPa to 20 MPa

et al. 2018

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High-pressure experimental pressure−density−temperature data for the propan-1-ol (1) + n-octane (2), propan-1-ol (1) + n-nonane (2), and propan-1-ol (1) + n-decane (2) binary systems are presented. Measurements were conducted over the entire composition range, in the temperature range of 313.15 to 363.15 K, from approximately 1 to 20 MPa, by using an Anton Paar DMA HP densitometer and a newly commissioned pressurizing network. The binary experimental density data is correlated by the fiveparameter modified Toscani−Szwarc equation of state, which demonstrates good correlation of the data. Excess molar volumes for the measured systems were determined as a function of pressure and temperature and were found to be positive for the measurement range considered in this work. Derived property data (thermal expansivity and isothermal compressibility) were also calculated for these systems and were found to be nonlinear in most instances. The effects of temperature and pressure on these properties were also discussed. The nonideality of the mixture properties was attributed to differences in the size and shape of the molecules and the energy interactions due to the polarity of the propan-1-ol molecules.

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Section: Introductionmentioning

confidence: 99%

P–ρ–T Data and Modeling for Propan-1-ol + n-Octane or n-Nonane or n-Decane from 313.15 K to 363.15 K and 1 MPa to 20 MPa

et al. 2018

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“…As a result, their determination for a practical usage is still the problem of fitting known experimental data on the pressure and the density for a certain region and each temperature separately. Then, this fitted values can be successfully used for the extrapolation to much more larger pressures, or with the goal of analytical fit of given obtained data [7,8,9,10].…”

Section: Introductionmentioning

confidence: 99%

Tait Equation Revisited from the Entropic and Fluctuational Points of View

2014

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We consider the possibilities for prediction of liquids' density under pressure basing on the inverse reduced fluctuations parameter, which is directly connected with the isothermal compressibility. This quantity can be determined basing on the thermodynamical properties of saturated liquid and it consists of only two constant parameters within a relatively wide region close to the melting points. It is confirmed by the comparison with the experimental data on n-alkanes that the derived expression is a quite reasonable estimator without a necessity to fit data along some parts of isotherms for different temperatures. At the same time the obtained formula: i) can be reduced to the form of the Tait equation and ii) the resulting Tait's parameters in this representation have a clear physical meaning as functions of the excess entropy, which determines the mentioned reduced fluctuations.

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“…This approach is developed for mixtures of normal alkanes. We tested those proposed by Hijmans and Holleman (1961) and Ramos-Estrada et al (2006). Ramos-Estrada proposed for the density of normal alkanes and their mixtures:…”

Section: Fitting Equations and A Comparison With Existing Methodsmentioning

confidence: 99%