The gas-liquid critical properties of alkane mixtures: Cycloalkanes + n-Alkanes and Cycloalkanes + Branched Alkanes

1977 ◽  
Vol 30 (10) ◽  
pp. 2103 ◽  
Author(s):  
KN Marsh ◽  
CL Young
Keyword(s):  
Interaction Energy ◽  
Fluid Model ◽  
Van Der Waals ◽  
Energy Parameter ◽  
Critical Properties ◽  
Critical Temperatures ◽  
Branched Alkanes

The gas-liquid critical temperatures, Tcm of cycloalkane + n-alkane and cycloalkane + branched alkane mixtures are reported. The interaction energy parameter, ξ(expressing the deviation from the Berthelot combining rule), has been calculated for each mixture from the values of Tcm using the van der Waals one-fluid model. The values of ξ are within 0.5% of unity.

Gas-liquid critical temperatures of mixtures containing electron donors

1977 ◽  
Vol 30 (2) ◽  
pp. 401 ◽  
Author(s):  
GJ Campbell ◽  
RL Hurle ◽  
SP Lie ◽  
CL Young
Keyword(s):  
Interaction Energy ◽  
Diethyl Ether ◽  
Thermodynamic Data ◽  
Fluid Model ◽  
Specific Interaction ◽  
Energy Parameter ◽  
Electron Donors ◽  
The Other ◽  
Specific Interactions ◽  
Critical Temperatures

The gas-liquid critical temperatures, Tcm, of some mixtures of the electron donors, triethylamine, diethyl ether and diisopropyl ether with n-alkanes, benzene and hexafluorobenzene are reported. By using the van der Waals one-fluid model, an interaction energy parameter, ξ, has been calculated for each mixture from the values of T°m. The values of ξ for the n-alkane+electron donors are fairly close to unity, indicating that, as would be expected, there are no strong specific interactions between the unlike molecules. The values of ( for the electron donors with benzene give no definite indication of specific interactions. On the other hand, values of ξ for the electron donors with hexafluorobenzene indicate a specific interaction between the unlike molecules. These conclusions are discussed in relation to those reached from a consideration of other thermodynamic data.

Comparison of the values of the interaction parameter ξ from upper critical solution temperatures of acetone + alkanes with values obtained from gas-liquid critical temperatures

1977 ◽  
Vol 30 (4) ◽  
pp. 767 ◽  
Author(s):  
LS Toczylkin ◽  
CL Young
Keyword(s):  
Equation Of State ◽  
Interaction Parameter ◽  
Fluid Model ◽  
Van Der Waals ◽  
Critical Temperatures ◽  
Acetone Hexane ◽  
Critical Solution Temperatures

The upper critical solution temperatures, UCST , of acetone + alkane (n- C5H12 to n-C17H36) and acetone + hexane isomers have been measured. These results are used to calculate an interaction parameter ξ by using the van der Waals one-fluid model together with the Guggenheim equation of state. Values of ξ are compared with those obtained from the gas-liquid critical temperatures. The gas-liquid critical temperatures for the n- alkane + acetone systems were taken from the literature whereas those for the hexane isomers + acetone were measured in this work. The values of ξ calculated from gas-liquid critical temperatures are slightly greater than those calculated from the UCST as has been observed previously for other systems.

Gas-liquid critical properties of the cycloalkanes and their mixtures

1972 ◽  
Vol 25 (8) ◽  
pp. 1625 ◽  
Author(s):  
CL Young
Keyword(s):  
Vapour Pressure ◽  
Critical Region ◽  
Van Der Waals ◽  
Mixture Theory ◽  
Inert Gases ◽  
Critical Properties ◽  
Critical Temperatures ◽  
Fluid Mixture

Gas-liquid critical temperatures of the C5-C8 cycloalkane mixtures and the vapour pressure and densities of cycloheptane and cyclooctane near the critical region are presented. Deviations of the reduced vapour pressure and density of the cycloalkanes from those of the inert gases have been calculated. The deviations have been found to be similar for all four cycloalkanes. The critical temperatures of the mixtures have been discussed in terms of the van der Waals "one fluid" mixture theory.

Upper critical solution temperatures of hydrocarbon + fluorocarbon mixtures : mixtures with specific interactions

1980 ◽  
Vol 33 (3) ◽  
pp. 465 ◽  
Author(s):  
LS Toczylkin ◽  
CL Young
Keyword(s):  
Equation Of State ◽  
Interaction Energy ◽  
Hard Sphere ◽  
Fluid Model ◽  
Energy Parameter ◽  
Specific Interactions ◽  
The One ◽  
Critical Solution Temperatures

The upper critical solution temperatures of a series of compounds with perfluorotributylamine and with perfluorocyclohexene are reported. From these results the interaction energy parameter, ξ, has been calculated by using a hard sphere+attractive term equation of state, together with the one-fluid model. The values of ξ for these mixtures and a few calculated from literature upper critical solution temperatures have been discussed in terms of possible specific interactions between pairs of unlike molecules.

Phase-Behavior of Carbon-Dioxide and Hydrocarbon Mixtures

1985 ◽  
Vol 38 (12) ◽  
pp. 1739 ◽  
Author(s):  
RJ Sadus ◽  
CL Young
Keyword(s):  
Carbon Dioxide ◽  
Phase Behavior ◽  
Equations Of State ◽  
Fluid Model ◽  
Van Der Waals ◽  
Solubility Data ◽  
Critical Temperatures ◽  
Hydrocarbon Mixtures ◽  
Critical Solution Temperatures

Upper critical solution temperatures, gas-liquid critical temperatures and solubility data of carbon dioxide and hydrocarbon mixtures have been used to obtain a parameter, ξ, characterizing the interaction between pairs of unlike molecules in the mixture. The calculation of ξ values involved the use of the van der Waals one-fluid model together with the Guggenhiem and Redlich-Kwong equations of state. There is a discrepancy of several percent between ξ values calculated from the three sources of data. Trends in the value of ξ are discussed briefly.

Operational Time and Melt Fraction Based Optimization of a Phase Change Material Longitudinal Fin Heat Sink

2018 ◽  
Vol 10 (6) ◽  
Author(s):  
D. Jaya Krishna
Keyword(s):  
Phase Change ◽  
Phase Change Material ◽  
Heat Sink ◽  
Fluid Model ◽  
Melting Behavior ◽  
Base Temperature ◽  
Critical Temperatures ◽  
Volume Of Fluid Model ◽  
Change Material ◽  
Operational Time

Abstract In the present study, the numerical investigation has been performed for a phase change material (PCM)-based longitudinal fin heat sink. The fins are taken as an integral part of the heat sink and are made up of aluminum. The PCM considered in the study is RT44HC. Heat is transferred to the heat sink through its horizontal base. In order to simulate the melting behavior of the PCM, volume of fluid model has been used. To attain the best configuration with optimum operational time, Taguchi method has been used followed by analysis of melt fraction and maximum base temperature. The optimized heat sink configuration with maximum operational time has been obtained at the critical temperatures of 54.8 °C, 63 °C, and 72.6 °C.

scholarly journals An improved method for calculating critical temperatures and critical pressures in natural gas mixtures with up to nC11 hydrocarbons

2019 ◽  
Vol 74 ◽  
pp. 53
Author(s):  
Marvin Ricaurte ◽  
José M. Fernández ◽  
Alfredo Viloria
Keyword(s):  
Natural Gas ◽  
Empirical Model ◽  
Gas Mixtures ◽  
Gas Condensate ◽  
Critical Properties ◽  
Improved Method ◽  
Critical Temperatures

This study suggests an improvement to the empirical model proposed by Peng (1986, Can. J. Chem. Eng. 64, 827–830) to calculate critical temperatures and critical pressures in natural gas mixtures. It aims to extend its application to natural gas mixtures containing hydrocarbons compounds up to undecane (nC11). This work focuses on establishing new matrices of coefficients Aij by obtaining new binary interactions between heavy compounds and the rest of compounds present in natural gas mixtures. The analysis considered more than 300 natural gas mixtures. Different comparisons were made between calculated critical properties, and referenced critical properties. Mean absolute errors <1.00% for the critical temperatures, and <2.70% for critical pressures were obtained. These low average deviations demonstrate the accuracy of this study, and could be considered as an easy-to-use engineering tool for estimating critical properties in natural gas mixtures, applicable to lean gas, rich gas, gas condensate, and Natural Gas Liquids (NGL).

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