Antoine constants

Extensive tabulations of Antoine parameters are available for many chemicals of importance to engineers, chemists, and environmental scientists (9,19,20). Caution is in order when using tabulated Antoine constants because several forms of the correlating equation are found in the Hterature. In particular, there are variations in the sign before the second term, the units of temperature, and the use of natural or decimal logarithms of the vapor pressure. 

TMN = Minimum temperature for Antoine constant, deg C TMX = Maximum temperature for Antoine constant, deg C... 

Chlorobenzene(s), 3 602 6 211-225 24 275 Antoine constants, 6 215t from benzene, 3 619t, 620 chlorocarbon/chlorohydrocarbon of industrial importance, 6 227t diffusion coefficient in air at 0° C, l 70t economic aspects, 6 219-222 health and safety factors, 6 218-219 manufacture, 6 213-217 physical and thermodynamic properties, 6 214t... 

Dichlorobenzene Antoine constants, 6 215t chlorocarbon/chlorohydrocarbon... 

Hexaammineplatinum(IV), effective atomic number of noble gas, 7 590t Hexaaquachromium(III) ion, 6 533 Hexaaquamolybdenum(III) ion, 27 26-27 Hexaarylbiimidazolyl (HABI), piezochromic materials, 6 608 Hexabis(benzylthiomethyl)benzene, 24 180 Hexaborane(lO), physical properties of, 4 184t Hexaborane(12), 4 186 Hexabromocyclododecane, 22 467-468 formulations of, 22 460t physical properties of, 4 355t Hexabromocyclohexane, 3 602 Hexachlorobenzene, 3 602 Antoine constants, 6 215t physical and thermodynamic properties, 6 214t... 

Antoine constants, 6 215t chlorocarbon/chlorohydrocarbon of industrial importance, 6 227t toxocity, 6 2181 uses, 6 222-223 Monochloroborane, 73 636 a-Monochlorobutanoic acid (MBA),... 

Haggenmacher equation chem Equation to calculate latent heats of vaporizations of pure compounds by using critical conditions with Antoine constants. hag-3n maJi 3r l.kwa-zhon ... 

The IBM machines were used to set up the Antoine constants from determined data. A preliminary C value was obtained from the equation C = 239. — 0.19 /,. A and B were then obtained and new C values either side of the first C used and new A and B values found. In each case above, the boiling points at the experimental pressures were calculated and compared with the determined boiling points. 

Thomson s Method to Calculate Antoine Constants The Thomson method utilizes available boiling temperatures at three different pressures to calculate... 

Rearrangement of the Antoine equation (7.4.1) leads to the following equation, which permits the estimation of boiling points from known Antoine constants within the applicable range for a given pressure ... 

Stull presents data on ihc vapor pressures up to the critical point for methyl and eihyl ether. Ambrose ct a) presents Antoine constants tor all lour compounds Data at the normal boiling point ate also available for propyl ether and butyl ether"... 

Finally, reversing the first change of constants yields the Antoine constants... 

P. P. Radecki, T. N. Rogers, and M. E. Mullins, Initial Development of a Method to Predict Antoine Constant Group Contributions by Simultaneous... 

In addition to these publications, software is available that allows the user to determine vapor pressures of a wide variety of compounds at room temperature. The Texas Research Center (TRC) (1996) distributes a PC DOS/Windows database that contains experimentally derived Antoine constants for approximately 6000 chemicals from which vapor pressures at user-selected temperatures can be calculated. Another Windows-based program, MPBPVP by Meylan and Howard (1996), estimates the vapor pressure of organic compounds from their SMILES (Simplified Molecular Input Line Entry System) structure and their boiling points using the Antoine equation, the Grain-Watson method, and the Mackay method. 

Table 1.5 Antoine constant for some species In Psat = A-BA,T+ C) where Pis in kPa and Tis in °C...

Species Antoine constants Applicable temperature region, C v, liquid molar volume, cmV gmol... 

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