8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 1/40

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

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 2/40

urces.com)

pressibility factor.

ion.

sheet, just change

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 3/40

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

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 4/40

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.

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 5/40

**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

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 6/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 7/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 8/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 9/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 10/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 11/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 12/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 13/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 14/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 15/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 16/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 17/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 18/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 19/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 20/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 21/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 22/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 23/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 24/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 25/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 26/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 27/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 28/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 29/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 30/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 31/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 32/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 33/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 34/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 35/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 36/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 37/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 38/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 39/40

8/12/2019 Vapor Pressure of a Liquid Solution

http://slidepdf.com/reader/full/vapor-pressure-of-a-liquid-solution 40/40