|
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 Claussius-Clapeyron 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=10A-B/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=PAXA + PBXB +
....
|
Vapor
pressure
P
of a solvent blend is the sum of the partial
pressures of the components
|
|
|
Pi=PiXi
|
Pi is the vapor
pressure of the pure component Xi
is the mole fraction of the components
|
|
|
Enter Data
|
|
Results
|
|
|
Temperature, °C
|
|
Moles
|
Molar fraction
|
Partial pressure
|
Heat of vaporization
|
|
|
|
Weight
|
|
|
Hg mm
|
∆Hn,
kJ/mol
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Total
|
|
|
|
|
|
|
|
Vapor Pressure, Hg mm calc
|
|
|
|
|
|
|
|
Heat of Vaporization
DHn,
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 McGraw-Hill, New York NY, 2001
|
|
Antoine Parameters from Gmehling,
J., Onken, U., and Arlt, W., Vapor-liquid Equilibrium Data
Collection, Chemistry Data Series, Vol. I, Parts 1-8, DECHEMA
(1977-1990).
|
|
Last edited on:
|
October 15, 2010
|
Copyright®, Design, Layout and Technical Content by:
|
|
|