Density-temperature behavior of pure and defined binary and ternary hydrocarbon mixtures

(1992) Density-temperature behavior of pure and defined binary and ternary hydrocarbon mixtures. Masters thesis, King Fahd University of Petroleum and Minerals.


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Densities of the pure compounds of Benzene, Cyclohexane and n-Hexane as well as the densities of their binary and ternary mixtures have been measured using an experimental system whose accuracy and reliability have been previously established. The density measurements were carried out over a wide range of temperatures (ambient to 200?-C) and concentrations. The experimental data were compared with predictions by two renowned correlations; the Hankinson-Brobst=Thompson correlation (HBT) and the Spencer-Danner modified Rackett (SDR) equation. The two correlations appear to be quite satisfactory in predicting the saturated liquid density of the pure and liquid mixtures considered. The SDR predicts the experimental results with an overall average absolute deviation (AAD%) of 0.29% while the HBT has an AAD% of 0.61%. The excess molar volumes V for the binary liquid mixtures of benzene and cyclohexane, benzene and n-hexane, and cyclohexane and n-hexane from ambient to 200?C, were calculated from the density data. Values fo the V, for the three systems have been correlated, first as function of concentration using a 3-constant Redlich-Kister expansion; V = X(1-X) (A+B(1-2X)+C(1-2X)² And secondly, as a function of temperature by expressing the coefficients in the Redilich-Kister expansion in terms of temperature. Values of V have been found to be positive for benzene and cyclohexane and benzene and n-hexane mixtures. For cyclohexane and n-hexane, the values of V have been found to change from positive to negative with increasing temperature. The use of the Lennard-Jones potential to predict the density of benzene, cyclohexane and n-hexane through the use of molecular simulation was also investigated. The densities of benzene and n-hexane were predicted with a reasonable degree of accuracy, while the predictions made forcyclohexane involved considerable errors.

Item Type: Thesis (Masters)
Subjects: Chemical Engineering
Department: College of Chemicals and Materials > Chemical Engineering
Committee Advisor: Beg, Shafkat A.
Committee Members: Al-Harbi, Dulaihan K. and Hamad, Esam Z.
Depositing User: Mr. Admin Admin
Date Deposited: 22 Jun 2008 14:04
Last Modified: 01 Nov 2019 14:01