What are the Antoine constants for air?

Answer 1

{| |- | log10 Pvap = A - [B / (T °C + C)] barSUSTANCIA FORMULA A BC1-Buteno C4H8 3.91780 908.800 238.540 cis-2-Buteno C4H8 4.00958 967.320 237.873 trans-2-Buteno C4H8 4.00827 967.500 240.840 |} {| |- | log10 Pvap = A - [B / (T °C + C)] barSUSTANCIA FORMULA A BC1-Buteno C4H8 3.91780 908.800 238.540 cis-2-Buteno C4H8 4.00958 967.320 237.873 trans-2-Buteno C4H8 4.00827 967.500 240.840 |}

Answer 2

C2H6O has two isomers: ethanol (CH3-CH3-OH) or dimethyl ether (CH3-O-CH3).

The following are the Antoine's constants for ethanol, valid for the temperature range of 3-96 degrees Celsius:

A= 16.8958
B= 3795.17
C= 230.918

where Antoine's equation is:

ln(Psat [kPa]) = A - B/(T [°C]+C)

Psat is the saturation pressure (vapor pressure) in kilopascals [kPa]
T is the temperature in degrees Celsius [°C]

Note that this is the natural logarithm form of Antoine's equation (some literature lists a different equation with a base 10 logarithm, for which the constants will differ).

Source: Introduction to Chemical Engineering Thermodynamics (7th ed.) by J.M. Smith, H.C. Van Ness, and M.M. Abbot (page 682)

Answer 3

Antoine constants for air are typically not available since air is a mixture of gases and not a pure substance. Antoine equation is used to correlate vapor pressure with temperature for individual pure substances.

Answer 4

Antoine Constant A # kPa, °C 6.25478

Antoine Constant B # kPa, °C 1216.69

Antoine Constant C # kPa, °C 230.275

Answer 5

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