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I am a Chinese student ,and I try to get the VLE data for aniline +water in Journal of Chem & Engineering Data ,but I can 't find ,who can give me an advise ?? thnk you !
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Where I Can Get The Vle Data For Aniline +water?
Started by Relaco, Jul 29 2005 06:06 AM
4 replies to this topic
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#2
Guest_Guest_*
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Posted 31 August 2005 - 03:55 AM
Correct me if I'm wrong (I'm a student myself recovering from a 3 month summer break)
ya = (Pao/P)xa
Where
ya = mole fraction
xa = mole fraction
Pao = vapour pressure
P = total system pressure
Having the above as a relation between ya and xa for each component (depending on its vapour pressure) we can then plot the vle data(in excel for example) for each component.
I'm guessing aniline and water forms an azeotrope (strong hydrogen bonding ?..) so you will have to modify the above equation to take into account mixture non-ideality.
i.e. ya = (Pao/P)(xa)(gamma)
Where gamma is the activity coefficient which i'll leave that to you to explore (because i'm lazy- and its your homework afterall) tip- margules/van laar.. and I think once you have one you can use the gibbs-duhem equation to get the other.
You can get the vapour pressure from the antoine equation. ln(Pao) = A - B/T+C
And coefficients (A,B,C) from any cheme book e.g. Perry's
Your excel spreadsheet shall have columns:
xa | Pao (water) | ya (water) | Pao (aniline) | ya (aniline)
Plot xa vs ya(water) and on the same graph xa vs ya(aniline)
And you should get your vle diagram. And as a note you should look into more sources of information and not confine yourself only to one journal.
chris.
ya = (Pao/P)xa
Where
ya = mole fraction
xa = mole fraction
Pao = vapour pressure
P = total system pressure
Having the above as a relation between ya and xa for each component (depending on its vapour pressure) we can then plot the vle data(in excel for example) for each component.
I'm guessing aniline and water forms an azeotrope (strong hydrogen bonding ?..) so you will have to modify the above equation to take into account mixture non-ideality.
i.e. ya = (Pao/P)(xa)(gamma)
Where gamma is the activity coefficient which i'll leave that to you to explore (because i'm lazy- and its your homework afterall) tip- margules/van laar.. and I think once you have one you can use the gibbs-duhem equation to get the other.
You can get the vapour pressure from the antoine equation. ln(Pao) = A - B/T+C
And coefficients (A,B,C) from any cheme book e.g. Perry's
Your excel spreadsheet shall have columns:
xa | Pao (water) | ya (water) | Pao (aniline) | ya (aniline)
Plot xa vs ya(water) and on the same graph xa vs ya(aniline)
And you should get your vle diagram. And as a note you should look into more sources of information and not confine yourself only to one journal.
chris.
#3
trilok_sontakke
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Posted 11 September 2005 - 06:20 AM
QUOTE (Relaco @ Jul 29 2005, 06:06 AM)
I am a Chinese student ,and I try to get the VLE data for aniline +water in Journal of Chem & Engineering Data ,but I can 't find ,who can give me an advise ?? thnk you !
Dear Relaco
i got calculations.
tell me ur mail ID so that i can send u.
my email trilok_sontakke@yahoo.co.in
#4
siretb
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Posted 12 September 2005 - 05:41 AM
I have the following data (from library, unchecked)
at 745 mmHg following T°C x water molefrac y water molefrac
T X Y/
101° 0..247 0.946/105 0.2 0.945/109.8 0.159 0.925/115.8 0.117 0.884
121 0.093 0.855/126 0.076 0.814/131 0.059 0.773/140 0.043 0.693
152 0.025 0.541/160 0.017 0.48/168 0.0105 0.342
You should be able to find a lot of data in the DECHEMA/Gmehlin series.
If you regress the above data, for instance to be able to use it at atmospheric pressure, do not forget you have a Liquid-Liquid-Vapor system.
at 745 mmHg following T°C x water molefrac y water molefrac
T X Y/
101° 0..247 0.946/105 0.2 0.945/109.8 0.159 0.925/115.8 0.117 0.884
121 0.093 0.855/126 0.076 0.814/131 0.059 0.773/140 0.043 0.693
152 0.025 0.541/160 0.017 0.48/168 0.0105 0.342
You should be able to find a lot of data in the DECHEMA/Gmehlin series.
If you regress the above data, for instance to be able to use it at atmospheric pressure, do not forget you have a Liquid-Liquid-Vapor system.
#5
Guest_ChE_*
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Posted 15 September 2005 - 02:28 PM
ChemCAD can spit that out I imagine.
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