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Forum index » Science and Technology » Engineering » Chemical
Enthalpy-Concentration curves for a mixture
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Torben Laursen
science forum beginner


Joined: 05 Jun 2005
Posts: 5

PostPosted: Tue Jun 06, 2006 8:47 am    Post subject: Re: Enthalpy-Concentration curves for a mixture Reply with quote

Hi Etienne

If you only need a few numbers I can do the calculations for you for free.

All you have to do is send me the parameters that you want to use in a excel
file.
You can use eighter PC-SAFT or Sanchez/Lacombe
You can find my contact info on my homepage www.vlxe.com

Regards Torben

"aTn" <ayottes@dms.umontreal.ca> wrote in message
news:1149278569.449906.307310@i39g2000cwa.googlegroups.com...
Quote:

Hi,

I'm trying to find liquid and vapor phase Enthalpy vs.Concentration
curves for the mixture propane-propylene. Is there a method to obtain
these curves using software like ChemSep or ChemCad ? All the tables I
found in the litterature didn't seem to help. Any suggestion would be
appreciated.

Thanks in advance,

Etienne
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rudnyi
science forum addict


Joined: 20 May 2005
Posts: 75

PostPosted: Sat Jun 03, 2006 9:01 am    Post subject: Re: Enthalpy-Concentration curves for a mixture Reply with quote

Quote:
I'm trying to find liquid and vapor phase Enthalpy vs.Concentration
curves for the mixture propane-propylene. Is there a method to obtain
these curves using software like ChemSep or ChemCad ? All the tables I
found in the litterature didn't seem to help. Any suggestion would be
appreciated.

In the gas phase, the enthalpy is additive, that is

H = x1*H1 + x2*H2

where x1 and x2 are mole fractions in the gas phase, H1 and H2 are
enthalpies of pure components. In the liquid phase, you may need to add
the enthalpy of mixing.

The best way it to find a database with the Gibbs energies and then all
the properties can be computed on the fly. You have a look

at

http://www.thermocalc.com/

or

http://www.factsage.com/

but I do not know if they have databases for organics.

You can have a look at equations on how one computes everything from
the Gibbs energy at

http://evgenii.rudnyi.ru/soft/tdlib00+/doc/00tdlib.pdf
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aTn
science forum beginner


Joined: 02 Jun 2006
Posts: 1

PostPosted: Fri Jun 02, 2006 8:02 pm    Post subject: Enthalpy-Concentration curves for a mixture Reply with quote

Hi,

I'm trying to find liquid and vapor phase Enthalpy vs.Concentration
curves for the mixture propane-propylene. Is there a method to obtain
these curves using software like ChemSep or ChemCad ? All the tables I
found in the litterature didn't seem to help. Any suggestion would be
appreciated.

Thanks in advance,

Etienne
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Google

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