Abstract
A robust and efficient procedure is presented for calculating the solubility parameter. An analytical equation for internal pressure is proposed. Through a simple relation reported by Verdier and Andersen (fluid phase equilibrium 231: 125–137, 2005), one can easily find the solubility parameter via our analytical equation for the internal pressure. Also, the radial distribution function (RDF) of a Lennard–Jones LJ (12, 6) fluid, proposed by Xu and Hu (fluid phase equilibrium 30: 221–228, 1986), has been employed to calculate the internal pressure of normal alkanes from methane to decane. Their solubility parameters were evaluated according to the calculated values of the internal pressure. A comparison between the experimental and the estimated values demonstrated a very good agreement between them.
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Acknowledgments
The authors are indebted to Prof. A. Boushehri for his stimulating suggestions, incisive comments, important criticisms, skillful technical assistance, instructive and useful discussions, and sharing of information. We acknowledge helpful conversations with him. We are much indebted to Prof. A. Maghari for his generous encouragement, his provocative insights, and many enticing vistas opened up by his classic studies of statistical mechanics (both equilibrium and non-equilibrium).
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This paper is dedicated to Professor G. A. Mansoori.
Appendices
Appendix A. Some Well-Known Expressions for the RDF of a LJ Fluid
1.1 A. 1 The Matteoli and Mansoori Expression [22]
See Appendix Table 2
Matteoli and Mansoori [22] have derived an explicit expression for the RDF of a LJ fluid as follows:
where \( y = r/h\sigma \) is the dimensionless inter-particle distance and \( h,\,m,\,\lambda ,\,\alpha \) and \( \beta \) are adjustable parameters that are functions of both temperature and density. These parameters have been expanded in terms of \( \rho^{*} \) and \( T^{*} \), using \( 21 \) constants. This expression is valid within the ranges \( 0.6 \le T^{*} \le 3.7 \) and \( 0.35 \le \rho^{*} \, \le \;0.9 \).
1.2 A.2 The Morsali et al. Expression [23]
Morsali et al. [23] derived the following expressions for the RDF of a LJ fluid:
where \( a,b,c,d,g,h,k,\,l,s,m, \) and \( n \) are adjustable parameters, being functions of both temperature and density. These parameters have been expanded in terms of \( \rho^{*} \) and \( T^{*} \), using \( 65 \) constants. This expression is valid within the ranges \( 0.5 \le T^{*} \, \le \;\,5.1 \) and \( 0.35 \le \rho^{*} \, \le \;1.1 \).
Appendix B. Equations of State Employed in this Study
2.1 B.1 Peng–Robinson Equation of State [33]
The Peng–Robinson EOS [33] for pure fluids can be written as
where p denotes pressure, T temperature, v molar volume and R the gas constant.
The temperature-independent repulsive parameter b is:
where \( T_{c} \) and \( p_{c} \) are the critical temperature and pressure, respectively. The temperature-dependent attractive parameter \( \alpha (T) \) is given by the expression:
where
2.2 B.2 Modified Peng–Robinson Equation of State \( ({\text{PR - f}} - mod) \) [33]
Modification of the Peng–Robinson (PR) equation of state (EOS) gives a useful method that enhances the equation of state pure component property predictions through simple temperature dependences such as:
where T is the temperature and \( j_{1} ,j_{2} \) and \( j_{3} \) are fitting parameters. The \( p_{c}^{\prime } \) and \( \omega^{\prime } \) values are correlated as follows:
where \( \mu_{p} ,\mu_{m} ,\eta_{p} ,\eta_{m} \) are linear fitting parameters. These equations indicate that only one of the regressed parameters is independent and the other two are correlated with it. Then, the \( {\text{PR - f}} - mod \) EOS can be written as:
where b is
and
2.3 B.3 The Nicolas et al. EOS [34]
Molecular dynamics calculations of the pressure and configurational energy of a LJ fluid have been reported for 108 state conditions in the density range \( 0.35 \le \rho^{*} \, \le \;1.20 \) and temperature range \( 0.5 \le T^{*} \, \le \;6 \) (where \( \rho^{*} = \rho \sigma^{3} ,\;T^{*} \, = \;k_{B} T/\varepsilon \)) [34]. Particular attention is paid to the dense fluid region \( (\rho^{*} \, \ge \;0.9) \), including state conditions in the sub-cooled liquid region These simulation results for \( p \) and \( U \) were combined with results from previous workers, together with low density values calculated from a virial series, to derive an equation of state for the LJ fluid that is valid over a wide range of temperatures and densities. The equation used by Nicolas et al. in dimensionless form is as follows:
The equation for the reduced configurational energy corresponding to the above equation is obtained from
and the second virial coefficient is given by
Values of the resulting parameters \( x_{1} , \ldots .,x_{32} \) and \( \gamma \) are listed in Table 2.
2.4 B.4 The Mecke et al. EOS [35]
An equation of state (EOS) was proposed [35] for the Helmholtz energy \( F \) of the LJ fluid, which represents the thermodynamic properties over a wide range of temperature and densities. The EOS was written in the form of a generalized vdW equation \( F = F_{H} + F_{A} \), where \( F_{H} \) accounts for the hard-body interaction and \( F_{A} \) for the attractive dispersion forces.
For a system of hard spheres with a packing fraction \( \xi \) the residual Helmholtz energy \( F_{H} \) is given according to Carnahan and Starling as
where \( F_{H}^{*} = F_{H} /N\varepsilon \)and \( \xi \) by
where \( \rho_{C}^{*} = 0.3107 \) and \( T_{C}^{*} = 1.328 \) are the critical density and temperature, respectively.
The crucial point is now represented by an equation for\( F_{A} \). \( F_{A} \) is given by the following equation:
where \( F_{A}^{*} = F_{A} /N\varepsilon \) and the powers \( m_{i} ,\;n_{i} ,\;p_{i} \), and \( q_{i} \), as well as the coefficients \( c_{i} \), are to be determined by an optimization procedure. The EOS expressed above covers the whole fluid region up to the highest densities in the temperature range \( 0.7 \le T^{*} \, \le \;10.0 \) with high accuracy. For higher temperatures, the EOS follows a physically correct behavior by using simulation data up to \( T^{*} \, = \;100.0 \) in the density region \( \rho^{*} \, \le \;1.0 \).
Appendix C Derivation of the Theoretically-Based Relationship Between Internal Pressure and Density
As mentioned in the text, the explicit RDF expression of Xu and Hu [24] is as follows:
where H is the Heaviside function:
and \( \delta \) is the Dirac delta function:
The internal pressure and inter-particle pair potential, \( u(r) \), are related by the following equation:
where \( g(r) \) is the RDF, and \( \rho \) is the density.
Insertion of the RDF expression of Xu and Hu [24] into the aforesaid equation and then integration gives:
For the sake of brevity we define the reduced expressions for internal pressure and density, respectively:\( \pi_{T}^{*} \equiv \pi_{T} \sigma^{3} /\varepsilon \) and \( \rho^{*} \equiv \rho \sigma^{3} \),
The final result in terms of reduced parameters is:
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Oghaz, N.M., Haghighi, B., Alavianmehr, M.M. et al. Prediction of Solubility Parameters Based on the Explicit Expression of Statistical Thermodynamics. J Solution Chem 42, 544–554 (2013). https://doi.org/10.1007/s10953-013-9978-9
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DOI: https://doi.org/10.1007/s10953-013-9978-9