Excel library for process calc's including distillation

[pdas]

Properties is able to calculate the true critical points of multicomponent mixtures, I do that from the Excel application page distributed with the software, it plots the phase envelope with critical points, cricondenbar and cricondentherm.

[matrenel]

I have a C1-C9 + N2, CO2 mixture and I wish to calculate phase envelope with critical point,
how reliable is this sofware ?
have you compared resuls against oter simulators ?

[carlo.stenali]

I would suggest that you read this page
"http://www.prode.com/en/phaseenvelope.htm"
then if you have specific questions post here,
Carlo

[matrenel]

thanks

[rbru]

very, very nice,
thank you !

[cmarc]

May I ask for a little help with multiphase vapor-liquid-liquid ?
I get vapor + two liquid phases where another software says there is a vapor and one liquid phase, I would be interested in a procedure for testing the stability of the mixture.

[carlo.stenali]

cmarc,
Properties does have methods for calculating fugacites and derivatives vs. composition, pressure, temperature, see the manual , page 60

"http://www.prode.com/docs/pppman.pdf"

here there is a copy and paste

integer res = StrFv(integer stream,integer state,double t ,double p, double *w,double *fg)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of fugacities (Pa)
integer res = StrFvd(integer stream,integer state,double t ,double p, double *w,double *fg, double *dfgt,
double *dfgp, double **dfgw)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of fugacities (Pa)
and related derivatives vs. temperature (K), pressure (Pa), composition (note : derivatives vs. composition as matrix [n][m])
integer res = StrFvdv(integer stream,integer state,double t ,double p, double *w,double *fg, double *dfgt,
double *dfgp, double *dfgw)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of fugacities (Pa)
and related derivatives vs. temperature (K), pressure (Pa), composition (note : derivatives vs. composition as vector [n*m])
integer res = StrlnFv(integer stream,integer state,double t ,double p, double *w,double *lnfg)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of ln fugacities
integer res = StrlnFvd(integer stream,integer state,double t ,double p, double *w,double *lnfg, double
*dlnfgt, double *dlnfgp, double **dlnfgw)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of ln fugacities
and related derivatives vs. temperature (K), pressure (Pa), composition (note : derivatives vs. composition as matrix [n][m])
integer res = StrlnFvdv(integer stream,integer state,double t ,double p, double *w,double *lnfg, double
*dlnfgt, double *dlnfgp, double **dlnfgw)
Given a predefined stream the required state (vapor, liquid, solid) ) and operating conditions returns the vector of ln fugacities
and related derivatives vs. temperature (K), pressure (Pa), composition (note : derivatives vs. composition as vector [n*m])

with these methods you can use the tngent plane analysis to validate the stability of a system,
do you know this procedure ? If not I can suggest some good textbooks.

[cmarc]

I remember Baker's work, do you suggest to calculate the tangent plane distance from compositions & fugacities ?
That could be done in Properties, unfortunately I can't with a different software.

[tinom]

to validate a condition you must find a way to calculate Gibbs energy (and compare with a different state)

[cmarc]

thanks carlo.stenali & Tinom,
another question,
how can I set BIPs for UNIQUAC, NRTL etc. ?

[carlo.stenali]

in Properties you can set BIPs via Stream Editor or programmatically (there are more than 300 methods/macros exported which you can use)
Properties has a database for Kij, Aij, Gij etc. and procedures to regress VLE/LLE data.

[cmarc]

carlo.stenali,
I wish to define compositions and BIPs from Excel VBA, which is the correct way ?
Thank you.