scholarly journals Saturated-liquid heat capacity of organic compounds: New empirical correlation model

2004 ◽  
Vol 69 (3) ◽  
pp. 233-237 ◽  
Author(s):  
Jovan Jovanovic ◽  
Dusan Grozdanic
Keyword(s):  
Heat Capacity ◽  
Critical Point ◽  
Organic Compounds ◽  
Correlation Model ◽  
Saturated Liquid ◽  
Experimental Heat ◽  
Capacity Model ◽  
Polynomial Models ◽  
Liquid Heat ◽  
Capacity Data

A new saturated-liquid heat capacity model is recommended. This model is tested and compared with the known polynomial and quasi-polynomial models on 39 sets with 1453 experimental heat capacity data. The obtained results indicate that the new model is better then the existing models, especially near the critical point.

scholarly journals Saturated-liquid heat capacity calculation of alkanes

2005 ◽  
Vol 70 (12) ◽  
pp. 1545-1551 ◽  
Author(s):  
Jovan Jovanovic ◽  
Dusan Grozdanic
Keyword(s):  
Heat Capacity ◽  
Critical Point ◽  
Empirical Model ◽  
Heat Capacity Data ◽  
Saturated Liquid ◽  
New Model ◽  
Experimental Heat ◽  
Capacity Calculation ◽  
Liquid Heat ◽  
Capacity Data

An empirical model for the calculation of the heat capacity of alkanes is recommended. This model was tested and compared to known models (Luria-Benson and R?zicka-Domalski) using 68 sets with 1155 literature experimental heat capacity data of 39 alkanes. The obtained results indicate that the new model is slightly better of the existing models, especially near the critical point.

scholarly journals Saturated-liquid heat capacity: New polynomial models and review of the literature experimental data

2003 ◽  
Vol 68 (6) ◽  
pp. 479-495 ◽  
Author(s):  
Jovan Jovanovic ◽  
Dusan Grozdanic
Keyword(s):  
Experimental Data ◽  
Heat Capacity ◽  
Heat Capacities ◽  
Review Of The Literature ◽  
Saturated Liquid ◽  
Correlation Models ◽  
Polynomial Models ◽  
Liquid Heat

In this paper a review of selected literature experimental data for saturated-liquid heat capacities was presented. Two-, three- and four-parameter polynomial correlation models are tested on those data. Obtained results lead to the conclusion that correlation quality depends on the number of parameters, and slightly on the type of models. The best two three- and four-parameter models were proposed.

scholarly journals Prediction of high pressure liquid heat capacities of organic compounds by a group contribution method

2011 ◽  
Vol 76 (3) ◽  
pp. 417-423 ◽  
Author(s):  
Jovan Jovanovic ◽  
Andjela Knezevic-Stevanovic ◽  
Dusan Grozdanic
Keyword(s):  
High Pressure ◽  
Organic Compounds ◽  
Order Approximation ◽  
Heat Capacities ◽  
Group Contribution ◽  
Experimental Heat ◽  
Data Points ◽  
Liquid Heat ◽  
First Order Approximation ◽  
Capacity Data

A new method for estimating high pressure liquid heat capacities based on molecular structure and group contribution is proposed. A common set of structural groups was employed. The method was developed using 67 sets of 43 organic compounds with 3449 experimental heat capacity data. A small number of measured compounds, data points per compound and other comparable methods were observed. This is a simple first-order approximation with acceptable accuracy of 2.548%.

scholarly journals A New Four-Parameter Cubic Equation of State for Predicting Fluid Phase Behavior

2019 ◽  
Author(s):  
zhiren he
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Saturated Vapor ◽  
Liquid Density ◽  
Saturated Liquid ◽  
Cubic Equation ◽  
Liquid Heat ◽  
Entropy Of Vaporization ◽  
Saturated Liquid Density

<p>A new four-parameter cubic equation of state (EoS) is generated by incorporating the critical compressibility factor (Z<sub>c</sub>) apart from the critical pressure (P<sub>c</sub>) and temperature (T<sub>c</sub>). One free parameter in the denominator of the attractive term and two parameters in the alpha function are adjusted using the experimental data of saturated liquid density, vapor pressure, and isobaric liquid heat capacity of 48 components including hydrocarbons and non-hydrocarbons. Applying this equation of state, saturated liquid density, saturated vapor density, and vapor pressure of pure components are accurately reproduced compared with experimental values. Furthermore, the predicted properties including derivatives of alpha function, such as enthalpy of vaporization, entropy of vaporization and isobaric heat capacity of liquid, also have decent accuracy. The global average absolute relative deviation (AAD) of saturated liquid density, saturated vapor density, saturated vapor pressure, enthalpy of vaporization, entropy of vaporization, and isobaric heat capacity of liquid in a wide reduced temperature (Tr) range of subcritical region reproduced by this work are 4.33%, 4.18%, 3.19%, 2.26%, 2.27%, and 5.82%, respectively. Substantial improvement has been achieved for the isobaric liquid heat capacity calculation.</p>

scholarly journals A New Four-Parameter Cubic Equation of State for Predicting Fluid Phase Behavior

2019 ◽  
Author(s):  
zhiren he
Keyword(s):  
Heat Capacity ◽  
Equation Of State ◽  
Vapor Pressure ◽  
Saturated Vapor ◽  
Liquid Density ◽  
Saturated Liquid ◽  
Cubic Equation ◽  
Liquid Heat ◽  
Entropy Of Vaporization ◽  
Saturated Liquid Density

<p>A new four-parameter cubic equation of state (EoS) is generated by incorporating the critical compressibility factor (Z<sub>c</sub>) apart from the critical pressure (P<sub>c</sub>) and temperature (T<sub>c</sub>). One free parameter in the denominator of the attractive term and two parameters in the alpha function are adjusted using the experimental data of saturated liquid density, vapor pressure, and isobaric liquid heat capacity of 48 components including hydrocarbons and non-hydrocarbons. Applying this equation of state, saturated liquid density, saturated vapor density, and vapor pressure of pure components are accurately reproduced compared with experimental values. Furthermore, the predicted properties including derivatives of alpha function, such as enthalpy of vaporization, entropy of vaporization and isobaric heat capacity of liquid, also have decent accuracy. The global average absolute relative deviation (AAD) of saturated liquid density, saturated vapor density, saturated vapor pressure, enthalpy of vaporization, entropy of vaporization, and isobaric heat capacity of liquid in a wide reduced temperature (Tr) range of subcritical region reproduced by this work are 4.33%, 4.18%, 3.19%, 2.26%, 2.27%, and 5.82%, respectively. Substantial improvement has been achieved for the isobaric liquid heat capacity calculation.</p>

Thermal Properties of Alcaline-Earth-Oxides / III. Analysis of Anharmonic Effects

1972 ◽  
Vol 27 (4) ◽  
pp. 605-612 ◽  
Author(s):  
E. Gmelin ◽  
S. Vieira
Keyword(s):  
Heat Capacity ◽  
Thermal Properties ◽  
High Temperature ◽  
Order Approximation ◽  
First Order ◽  
Anharmonic Effects ◽  
Experimental Heat ◽  
Theoretical Predictions ◽  
First Order Approximation ◽  
Capacity Data

Abstract Experimental heat capacity data for the alcaline-earth-oxides have been used to analyse by a new method the high temperature thermodynamic properties of these crystals in terms of quasi-harmonic and explicit anharmonic contributions. The explicit anharmonic contribution ΔC is consistent with theoretical predictions; ΔC is proportional to T in a first order approximation. The factor of anharmonicity A is negative for MgO, A = (-0.4 + 0.4) · 10-5 K-1 , for SrO A= (-2.8±1) · 10-5 K-1 and for BaO A=(-3.9±1) ·10-5 K-1 , but positive for CaO A = (2.3 ± 1.2) · 10-5 K-1. Comparison with the results of analysis of the anharmonic effects in the alcaline-halides shows that the alcaline-earth-oxides may be treated by the same models valuable for the alcaline-halides. The results suggest that the type of anharmonic forces is determined in the alcaline-halides as well as in the alcaline-earth-oxides primarily by the cation of the salt.

Some Heat-Capacity Data on Organic Compounds obtained with a Radiation Calorimeter

1932 ◽  
Vol 36 (3) ◽  
pp. 882-888 ◽  
Author(s):  
M. E. Spaght ◽  
S. B. Thomas ◽  
G. S. Parks
Keyword(s):  
Heat Capacity ◽  
Organic Compounds ◽  
Heat Capacity Data ◽  
Capacity Data

Asymmetric Scaled Equation of State and Critical Behavior of Binary Mixtures

1988 ◽  
Vol 110 (4a) ◽  
pp. 986-991 ◽  
Author(s):  
M. A. Anisimov ◽  
S. B. Kiselev ◽  
I. G. Kostukova
Keyword(s):  
Heat Capacity ◽  
Free Energy ◽  
Equation Of State ◽  
Binary Mixtures ◽  
Critical Line ◽  
Universal Function ◽  
Wide Neighborhood ◽  
Critical Isochore ◽  
Experimental Heat ◽  
Capacity Data

An equation of state for binary mixtures, accounting for the asymmetry with respect to the critical isochore in the wide neighborhood of the liquid–gas critical line, has been obtained on the basis of the isomorphic scaled free energy of mixtures and the extended scaled equation of state for pure fluids. Universal behavior of critical binary mixtures is demonstrated. The universal function is used for the description of experimental heat capacity data for a number of binary mixtures.

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