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8/12/2019 Vapor Pressure of a Liquid Solution
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Vapor Pressure of a Liquid Solutioncreated by Christopher Haslego, author of the Chemical Engineers' Resource Page (http://www.cheres
Instructions for this spreadsheet:
This spreadsheet will take the following inputs: Temperature
Liquid Composition of one component
Critical Temperatures and Pressures
Molar Volumes
Simply input the data into the yellow cells and click on the "Solve Spreadsheet" button.**
The vapor pressure of the two liquid solution will appear at the top of the sheet.
The true vapor pressure of each component (also called fugacity) in labeled f 0
The error associated with this method is +/- 1.00%
**The spreadsheet does not have to solved to get the vapor pressure of the solution, only to get the co
This value only influenced the activity coefficients and has no bearing on the vapor pressure of the solu
ie. If you don't need the activity coefficients or the compressiblity factor, don't bother solving the spreadyour inputs
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urces.com)
pressibility factor.
ion.
sheet, just change
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Vapor Pressure of a Liquid SolutionCreated by Christopher Haslego, author of the Chemical Engineers' Resource Page (http://www.cheresources.com)
Chemical 1= Water Vapor PressChemical 2= MEG
<--enter data at yellow cells
T (0C)
Mole Fraction of
Chemical 1 in Liquid
Mole Fraction of
Chemical 1 in Vapor
Mole Fraction of
Chemical 2 in Liquid
Mole Fraction of
Chemical 2 in Vapor
100 0.5 0.979195199 0.500 0.021
C1 (kPa-1/2
) C2 (kPa-1/2
) D1 (kPa-1
) D2 (kPa-1
)
0.003333 0.004943 0.00000099 0.00000259
-FP(1+FP) (E P)(FP) Compressibility Actvity Coeff. 1 Actvity Coeff. 2
0.001044846 0.000000119 0.9990 0.998975 0.998039
Constants:
Critical Pressure of Substance 1 in kPa =
0.0000 Critical Pressure of Substance 2 in kPa =
Critical Temp of Substance 1 in Celsius=
Critical Temp of Substance 2 in Celsius=
Molar Volume of Substance 1 (m3/mol)=
Molar Volume of Substance 2 (m3/mol)=
Pressure of Distillation Process (kPa)=
Antoine Equation ConstantsChemical 1
A= 7.96681
B= 1668.210
C= 228.000
Solve Spreadsheet
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re of Solut ion= 51.7005 kPa
vapor pressure of each comp Reduced Temperatures
Pv1 (kPa) Pv2 (kPa) Tr1 (0C) Tr2 (
0C)
50.661 1.076 0.576 0.648
E (kPa-1
) F (kPa-1
)
0.0033665 0.0000010
f 01 (kPa) f 02 (kPa)
50.6243 1.0762
22129.38
7520
374.15
303
0.000018
0.00005558
101.325
Chemical 2
8.091
2088.900
203.500
correct or "real"values..also called
fugacity.
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**Note that only chemicals marked "Eq 1" are for use on the spreadsheet.
Water 1 0-60 8.10765 1750.286 235
1 60-150 7.96681 1668.21 228
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