Abstract
Evidence for triple point corresponding states in temperature and pressure are presented for long-chain n-alkanes. As the carbon chain length exceeds n=9, variation in triple point pressures, Pm, due to odd-even carbon number effects rapidly converge to a single line. Similar behavior is observed for the reduced value, Prm=Pm/Pc. Likewise, odd-even variations in the reduced triple point temperature, Trm=Tm/Tc, rapidly approach 0.4 Trm deviates less than 1 per cent from 0.4 between n=12 and n=100 when Tc is based on a regression of experimental data to the Kreglewski—Zwolinski equation form. The rapid convergences in Trm and in Prm allow determination of Tc and Pc of thermally unstable n-alkanes based on triple point measurements. Triple point correlations for n-alkanes can be used to constrain vapor pressure correlations for conformal fluids at low pressures.
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