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Vapor Pressure of
Solvent Blends using Antoine Constants of Solvents

This program permits to calculate the vapor
pressure of solvent blends at different temperatures using the
Antoine equations and Raoult's law for solvent blends. The Antoine
equation describes the relation between saturated vapor pressure and
temperature of a pure component. The Antoine equation is derived
from the ClaussiusClapeyron equation which describes the phase
transition between two phases of matter.

For solvent blends
the Raoult's law applies. The Raoult's law assumes that the solvent
blend is uniformly mixed. Many solvent systems deviate from the
linear behavior predicted by the law.


Antoine
equation

P = Pressure in Hg mm (torr),
T =Temperature in ºC,


P=10^{AB/C+T)}

A, B, C
= Antoine constants


Raoult's
law

Raoult's law states: the vapor pressure
of an ideal solution is dependent on the vapor pressure of each
chemical component and the mole fraction of the component present in
the solution.


P=P_{A}X_{A }+ P_{B}X_{B} +
....

Vapor
pressure
P
of a solvent blend is the sum of the partial
pressures of the components


P_{i}=P_{i}X_{i}

P_{i }is the vapor
pressure of the pure component X_{i}
is the mole fraction of the components


Enter Data


Results


Temperature, °C


Moles

Molar fraction

Partial pressure

Heat of vaporization



Weight



Hg mm

∆H_{n,
}kJ/mol






























Total







Vapor Pressure, Hg mm calc







Heat of Vaporization
DH_{n,
}kJ/mol







Composition of Vapor Phase


Mol fraction

Weight

Weight fraction































Total






B.E.Poling, J.M.Prausnitz, YJ.P. O’Connell, The Properties of Gases and Liquids 5th Ed Appl A. Mc McGrawHill, New York NY, 2001

Antoine Parameters from Gmehling,
J., Onken, U., and Arlt, W., Vaporliquid Equilibrium Data
Collection, Chemistry Data Series, Vol. I, Parts 18, DECHEMA
(19771990).

Last edited on:

October 15, 2010

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