High pressure speed of sound and density of (decalin + n -decane), (decalin + n -hexadecane) and ( n -decane + n -hexadecane) systems and thermodynamic modeling with PHCT equation of state

Speeds of Sound and Densities of Ternary and Quaternary Mixtures of Tetralin, Decalin, n-Decane, and n-Hexadecane: Experiments and Thermodynamic Modeling with PC-SAFT Equation of State

“…The molar heat capacity represents just a small percentage of density; therefore, this consideration does not influence significantly the final value of density. 10,11 In our calculations, 0.4% of variation in heat capacity impacts calculated density below the calculated uncertainty.…”

“…2 As discussed in previous works, in petroleum research, tetralin is a reference aromatic compound used as a surrogate to naphtha and kerosene fractions, 7 decalin is a reference naphthenic compound in diesel and kerosene fractions, 8 while n-decane and n-hexadecane are linear alkanes used to simulate kerosene and diesel fractions, respectively. 7,9 Nascimento et al 10,11 reported speeds of sound and density data at pressures, P, of 0.1, 5, 10, 15, 20, and 25 MPa and temperatures, T, of 313.15, 323.15, and 333.15 K for tetralin, decalin (mixture of cis-and trans-decalin, at a fixed composition, hereafter called only decalin), n-decane, and n-hexadecane, as well as for the binary mixtures (tetralin + n-decane), (tetralin + n-hexadecane), (decalin + n-decane), (decalin + n-hexadecane), and (n-decane + n-hexadecane) at different compositions. The experimental results were correlated with Prigogine−Flory−Patterson 12 (PFP) and perturbed-hard-chain theory 13 (PHCT) equations of state, with the PHCT model presenting better results.…”

“…Experimental results of density and speed of sound data for pure components and binary mixtures obtained in Nascimento et al 10,11 and in this work have been used to fit the values of the characteristic parameters for pure components and binary interaction parameters, using the Nelder-Mead Simplex method, 25 in order to minimize the following objective function:…”

“…Excess Molar Volume. As a continuation to the discussion on binary systems properties started in our previous works, 10,11 excess molar volumes (V E ) of the binary system {tetralin (1) + decalin (2)} were calculated from eqs 8 and 9:…”

Density and Volumetric Behavior of Ternary CO2 + n-Decane + cis-Decalin (or + trans-Decalin) Mixtures at High Pressure and High Temperature

“…Nevertheless, no volumetric data were reported. For the n-decane + decalin binary system, experimental density behavior has been explored by Nascimento et al 18 in a narrow temperature range (from 313.15 to 333.15 K) for pressure up to 25 MPa. Liquid−liquid−gas phase behavior for the CO 2 + n-decane + trans-decalin ternary system has been studied by Ritter et al, 19 reporting liquid-phase molar volume to be in equilibrium at temperature from 308.15 to 318.15 K.…”