Hydrocarbon Vapor Pressures

Cox, Edwin R.

doi:10.1021/ie50317a029

Cited by 66 publications

(26 citation statements)

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“…These results can be used to test the effectiveness of vapor-pressure representations for wide temperature intervals. Several common vapor-pressure equations (Antoine, (38) Cox, (39) and several forms of the Wagner equations provided fits to the measured values with deviations near the experimental uncertainties. The experimental uncertainties are represented by dashed lines in figure 6.…”

Section: Discussionmentioning

confidence: 96%

Thermodynamic properties of pyridine—I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values

Chirico¹,

Steele²,

Nguyen³

et al. 1996

The Journal of Chemical Thermodynamics

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Section: Discussionmentioning

confidence: 96%

Thermodynamic properties of pyridine—I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values

Chirico¹,

Steele²,

Nguyen³

et al. 1996

The Journal of Chemical Thermodynamics

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“…Early research (16)(17)(18)(19)(20)(21)(22) focused on the use of the Cox equation (23) to represent the vapor pressure of the compound. However, it was soon realized that the Cox equation did not appear to extrapolate accurately to the critical point.…”

Section: High-temperature Enthalpy Increment Measurementmentioning

confidence: 99%

Fifty years of thermodynamics research at Bartlesville

Steele¹

1995

The Journal of Chemical Thermodynamics

143

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“…In the original relationship (Cox, 1936) the number of adjustable parameters A i was three, but up to nine parameters have been used for describing highly accurate vapor pressures over a wide temperature range (Scott and Osborn, 1979). The most frequently used reference condition for To and p o is the normal boiling point or the critical point.…”

Section: Cox Equationsmentioning

confidence: 99%

Simple and controlled extrapolation of vapor pressures toward the triple point

Růržička

Majer

1996

AIChE Journal

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Although experimental vapor pressures are abundant in the medium-pressure range (psat , their values are scarce and uncertain at lower pressures due to experimental difficulties in determining the data. Reliable values are, however, required by technology (separation processes dealing with mixtures containing high molar mass compounds) and environmental concerns (transport and fate of high-boiling pollutants). The ability of frequently used vapor-pressure equations to extrapolate the data at medium pressures toward the triple-point temperature was tested on three groups of compounds (polar and nonpolar organic chemicals, n-alkanes, and 1-alkanols) for which reliable experimental data in the low-pressure range were available. Results of a simple extrapolation were compared with those from a simultaneous correlation of vapor pressures in the medium-pressure range and the differences between heat capacity of an ideal gas and that of the liquid available at lower temperatures. The latter is generally more reliable, as it is controlled by the exact thermodynamic constraints linking vapor pressures and the thermal data. The extent of improvement when using simultaneous correlation was examined, as well as the influence of the quality of input data on the results of extrapolation. Extrapolated values were compared with experimental vapor pressures and calorimetric enthalpies of vaporization that were selected from literature and pee of any important systematic errors. to accurately determine psat at low pressures is of prime importance from an environmental point of view.Reliable vapor-pressure data in the low-pressure range can be used for determining enthalpies of vaporization AHvap of high boiling compounds at 298.15 K, the vaporization data play an important role in various thermochemical and thermodynamic calculations for converting different enthalpic quantities between the gaseous and liquid states. Good-qual-

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Hydrocarbon Vapor Pressures

Cited by 66 publications

References 0 publications

Thermodynamic properties of pyridine—I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values

Thermodynamic properties of pyridine—I. Vapor pressures, high-temperature heat capacities, densities, critical properties, derived thermodynamic functions, vibrational assignment, and derivation of recommended values

Fifty years of thermodynamics research at Bartlesville

Simple and controlled extrapolation of vapor pressures toward the triple point

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