Heat capacities of liquid n-alkanes at elevated pressures

Benson, Montford S.; Snyder, Phillip S.; Winnick, Jack

doi:10.1016/s0021-9614(71)80019-8

Cited by 30 publications

(7 citation statements)

References 16 publications

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“…Although there are specific experimental methods for determining each property, the common methodology is to measure a set of them and derive the other ones by using thermodynamic relations. Appropriate methods have been designed for experimental measurements of ρ and u as a function of temperature, T , and pressure, p , ( p ρ T or puT data) because they are obtained with high precision from several experimental techniques. , Specifically, the complete set of magnitudes can be obtained from (i) pρT and p ref C p ,m T data ( C p ,m is measured at a reference pressure, p ref as a function of T ), (ii) p ρ T and puΤ data, and (iii) p ref ρ Τ , p ref C p ,m Τ , and puT measurements using a complex procedure based on a “predictor−corrector” algorithm . It has been shown that these methods provide a reliable description of the volumetric properties; however, the obtained results for heat capacities (isobaric and isochoric) are poor.…”

Section: Introductionmentioning

confidence: 99%

Thermophysical Characterization of Liquids Using Precise Density and Isobaric Heat Capacity Measurements As a Function of Pressure

et al. 2009

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A specific methodology for determining density, isobaric thermal expansivity, isothermal and isoentropic compressibility, and isobaric and isochoric heat capacity of liquids as a function of temperature and pressure is analyzed in detail. The procedure is based on the experimental determination of both the density using the Anton Paar DMA512P vibrating tube densimeter and the isobaric heat capacity using the micro DSCII calorimeter from Setaram, which was recently adapted to operate up to 70 MPa. All properties are derived from these measurements using appropriate thermodynamic relations. To estimate the attained accuracy, densities for hexane, nonane, decane, undecane, dodecane, tridecane, tetradecane, 1-hexanol, and toluene were measured in the temperature interval of (283.15 to 323.15) K and at selected pressures between (0.1 and 60) MPa. Isobaric heat capacities for the same liquids (except toluene) were previously reported. The comparison between the complete set of properties for these liquids and selected literature data shows that this methodology allows us to get an accurate description of the thermodynamic behavior of liquids as a function of temperature and pressure.

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Section: Introductionmentioning

confidence: 99%

Thermophysical Characterization of Liquids Using Precise Density and Isobaric Heat Capacity Measurements As a Function of Pressure

et al. 2009

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“…The isothermal P-V equations presented in Table II can be extended to P-V-T or P-V-x equations by writing the parameters K0, Kq , and, for three-parameter equations, , as temperature or composition dependent functions. The form of the temperature or composition dependence has little or no theoretical justification and has in the past been written as a second degree polynomial in temperature or composition (4,56).…”

Section: Experimental Program and Resultsmentioning

confidence: 99%

“…No. 4,1976 Supplementary Material Available: Experimental PVT data and Table IV (60 pages). Ordering information Is given on any current masthead page.…”

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confidence: 99%

Liquid phase PVTx properties of carbon tetrachloride-octamethylcyclotetrasiloxane binary mixtures

Benson¹,

Winnick²

1976

J. Chem. Eng. Data

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“…The work with the largest number of measurements is that of Banipal et al [10]. They are well represented by the equation of state; the deviations are not higher than 0.3 % in the temperature range from 318 K to 373 K. At 298 K, the measurements of Benson et al [12] deviate from the equation by less than 0.02 %. The deviations of their data increase to 0.5 % for higher temperatures (up to 358 K), and all of them are negative.…”

Section: Comparison To N-hexadecane Experimental Datamentioning

confidence: 99%

Equations of State for n-Hexadecane and n-Docosane

Romeo

Lemmon

2022

Int J Thermophys

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Equations of state for n-hexadecane (C16H34) and n-docosane (C22H46) have been developed as functions of the Helmholtz energy with independent variables of temperature and density. The equations were developed based on experimental values of density, speed of sound, isobaric heat capacity, and vapor pressure. With these equations, all thermodynamic properties of n-hexadecane and n-docosane can be calculated. For n-hexadecane, the uncertainty in vapor pressure is 0.5 %. The uncertainty of the saturated liquid density is 0.05 % from the triple point up to 400 K, and 0.2 % at higher temperatures. The uncertainty in densities is within 0.5 %. The speed of sound and isobaric heat capacity can be calculated within 0.25 %. The uncertainties of the properties calculated with the equation for n-docosane are 5 % for vapor pressure, 0.1 % for saturated liquid density, 1 % for density, 0.5 % and 1 % for speed of sound at atmospheric pressure and higher pressures, respectively, and within 3 % for heat capacity.

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Heat capacities of liquid n-alkanes at elevated pressures

Cited by 30 publications

References 16 publications

Thermophysical Characterization of Liquids Using Precise Density and Isobaric Heat Capacity Measurements As a Function of Pressure

Thermophysical Characterization of Liquids Using Precise Density and Isobaric Heat Capacity Measurements As a Function of Pressure

Liquid phase PVTx properties of carbon tetrachloride-octamethylcyclotetrasiloxane binary mixtures

Equations of State for n-Hexadecane and n-Docosane

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