Vapour pressures up to their critical temperatures of normal alkanes and 1-alkanols

Abstract

Values for the critical temperatures and critical pressures, and coefficients of equations for the vapour pressures of normal alkanes and 1-alkanols are given. They are based on surveys of the available data and estimates of the critical properties of the higher members. The resultant vapour-pressure curves show a progressive change in shape and there are corresponding changes in the coefficients of the equations.

Thermodynamic Properties of Methanol in the Critical and Supercritical Regions

“…1). Recently Bazaev et al [7] used isothermal (P − ρ) and isochoric (P − T ) break point techniques to extract vapor-pressure data from precise PVT measurements in the temperature range from 423.15 to 503.15 K. These data agree with values calculated from correlations [22,23,27,30,34] and reported experimental data [25,31,[36][37][38][39][40] to within 0.2-0.4%. Lydersen and Tsochev [37] have reported vapor pressures for pure methanol in the temperature range from 494.8 to 511.75 K. These data are about 0.1% higher than the data reported by Zubarev and Bagdonas [31] and by de Loos et al [39], while the data obtained by Kay and Donham [41] and Ambrose et al [40] are higher by 0.3% and 0.2%, respectively.…”

“…1. Comparisons of vapor pressures calculated from the equation developed by Ambrose and Walton [34] with values calculated from the correlations reported by other authors are shown in Fig. 2.…”

“…The deviations between the saturated pressures calculated with the Ambrose and Walton [34] correlation and values calculated with CRE-OS97-04 and other correlations are shown in Fig. 2 As one can see, the CREOS97-04 model reproduces all available experimental vapor-pressure data in the critical region with an AAD that is comparable with empirical correlation mentioned above i.e., the model reproduces experimental vapor-pressure data as well as multi-parameter empirical correlations which were directly fitted to the experimental data.…”

“…Ambrose and Walton [34] have proposed a vapor-pressure equation for pure methanol up to the critical temeperature. To represent available vapor-pressure data of methanol, they used an equation proposed by Wagner [35] with system-dependent constants.…”

“…de Loos et al [39] reported vapor-liquid equilibrium data for pure methanol obtained by using a high-pressure capillary glass-tube apparatus in the temperature range from 422 to 512.5 K. [2, 7, 25, 36-41, 45, 68, 131-134] together with values calculated from CRE-OS97-04 and various correlation equations [22,23,122]. [34] with values calculated with CREOS97-04 and various correlations developed by other authors [22,23,27,30].…”