THE VAPOR PRESSURES OF 30 INORGANIC LIQUIDS BETWEEN ONE ATMOSPHERE AND THE CRITICAL POINT

Technical Report · Thu Jun 13 00:00:00 EDT 1963

DOI:https://doi.org/10.2172/4138168· OSTI ID:4138168

Edwards, D G

Literature values of the vapor pressures of H/sub 2/, HD, D/sub 2/, N/ sub 2/, O/sub 2/, Ne, Ar, Kr, Xe, CO, NO, CH/sub 4/, N/sub 2/O, CO/sub 2/, HCl HBr, HI, SF/sub 6/, H/sub 2/S, Cl/sub 2/, Br/sub 2/, NH/sub 3/, C/sub 2/H/sub 2/ , SO/sub 2/, SO/sub 3/, COCl/sub 2/, HF, HCN, N/sub 2/O/sub 4/, CCl/sub 4/, and SnCl/sub 4/ were compared with the Kirchhoff formula log PK = --A/T + B between the normal boiling point and the critical point, where A and B are determined for each liquid. Plots are presented of the deviations computed by the equation: d = PK -- P b. Based on accurately determined curves for 17 of these substances, empirical hypotheses were developed to allow the prediction of the most probable course of the deviation curve in cases where the data appeared to be unreliable. In addition, where precise data were available, the possibility of the existence of fine structure curvature was demonstrated. The deviation curves were used to obtain tables of interpolated vapor pressure values which are, in most cases, more accurate by one order of magnitude than any now in the literature, particularly where smoothed regression curves do not discriminate between random experimental errors and systematic deviations of an arbitrarily chosen formula from the real vapor pressure curve. Since the deviation curve is invariably shown to approach the zero ordinate at the critical point with a large negative slope, the correspondence between the critical pressure and temperature is fixed with a high degree of confidence. A particular result of this work is that the critical pressure of NH/sub 3/ was shown to be about one atmosphere higher than the presently accepted value. The new values for the critical points of CH/sub 4/ , C/sub 2/N/sub 2/, HCN, and Br/sub 2/ also resolved differences existing between various authorities in the literature. (auth)

• Research Organization: California. Univ., Livermore. Lawrence Radiation Lab.
• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-48
• NSA Number: NSA-18-003722
• OSTI ID: 4138168
• Report Number(s): UCRL-7167
• Resource Relation: Other Information: Orig. Receipt Date: 31-DEC-64
• Country of Publication: United States
• Language: English

Related Subjects

CHEMISTRY
AMMONIA
ARGON
BOILING
BROMINE
CARBON DIOXIDE
CARBON MONOXIDE
CARBON NITRIDES
CARBON TETRACHLORIDE
CARBONYLS
CHLORIDES
CHLORINE
COMPUTERS
CYANIDES
DEUTERIUM
DEUTERIUM COMPOUNDS
DIAGRAMS
EQUATIONS
HIGH TEMPERATURE
HYDROBROMIC ACID
HYDROCHLORIC ACID
HYDROFLUORIC ACID
HYDROGEN
HYDROGEN SULFIDES
HYDROIODIC ACID
KRYPTON
LIQUIDS
METHANE
NEON
NITROGEN
NITROGEN OXIDES
OXYGEN
PHOSGENE
PRESSURE
SILICON FLUORIDES
SULFUR FLUORIDES
SULFUR OXIDES
TABLES
THERMODYNAMICS
TIN CHLORIDES
VAPORS
XENON