Good day.
I would like to use my own isotherm equation on Aspen Adsorption so I found out that I can use 'user procedure'.
However, when I run my simulation, I'm getting an error message
"No suitable version of Visual Studio was found - compilation aborted.
See the online help for details of the supported compilers."
So, I downloaded Visual Studio as well as FORTRAN compiler but I'm still getting the same error message. One guess is that I didn't link Aspen Adsorption with my own FORTRAN code.
If you have some ideas or insights, would you kindly let me know? Thank you for your time and supports.
Kind regards,
So-mang Kim
So-Mang Kim, Do you really need Aspen to determine the parameters of the adsorption isotherm. If you have qe vs Ce data, that's a simple numerical problem. Share your data, then one can advise something.
Mirosław Grzesik, Thank you so much for your reply and kind support.
My study is focusing on process simulation and not on the isotherm parameters. I obtained the parameters from the literature. However, since Aspen adsorption isotherm that I'm looking at is a function of partial pressure, I wanted to includ temperature dependency in the isotherm equation and I wrote a FORTRAN code for that.
One issue is that it is challenging to 'link' the FORTRAN code and Aspen adsorption via 'user procedure' option available in Aspen adsoprtion. Hope my explanation makes my question more clear. Thank you again.
Kind regards,
So-mang Kim
So-Mang Kim from what i understand equilibrium (isotherm) model is applicable only for adsorption under constant temperature condition, hence the name isotherm.
Why not try to derive a mass balance from first principles and couple it to a energy balance (which you will derive also) to account for the non-isothermal adsorption conditions and write a program to solve the model equations in order to ascertain the concentration and temperature profiles in the fluid-solid adsorption system instead.
So-Mang Kim, Now everything is clear. Any numerical calculations I did, I used Fortran and Basic programs that I wrote. So there is little I can help here.
So-Mang Kim Please look through the aspen isotherm estimation. Then, you can get easily adsorption isotherm for your required model through your experimental results. Its not need to run through Fortran Compiler. Its much complicated process. You can first fit your experimental data accurately. Then use Different PSA process to optimize the results.
Hello Dear So-Mang Kim, I was having the same problem. I have found that it is possible to write the isotherm inside the Aspen Adsorption and this procedure is most recommended than using a Fortran code. The language is very simple. Here I have written the extended dual-site Langmuir in its standard form:
CONSTRAINTS
// Flowsheet variables and equations...
Within Bed.layer(1).Isotherm(1).User_pPress_Isotherm(1)
For i in FDESet Do
For ii in ComponentList Do
W(i,ii) = IP(1,ii)*IP(2,ii)*exp(IP(3,ii)/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,ii)/(1+IP(2,"CO2")*exp(IP(3,"CO2")/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,"CO2") + IP(2,"N2")*exp(IP(3,"N2")/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,"N2")) +
IP(4,ii)*IP(5,ii)*exp(IP(6,ii)/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,ii)/(1+IP(5,"CO2")*exp(IP(6,"CO2")/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,"CO2")+IP(5,"N2")*exp(IP(6,"N2")/8.314*(1/313 - 1/T(i)))*P(i)*Y(i,"N2"));
EndFor
EndFor
EndWithin
END
In the isotherm assumed for layer, you need to choose the User Submodel.
In the following link, you can find how to write a customized isotherm (look up at workshop 6):
https://www.researchgate.net/profile/M_Quader2/post/I_want_to_simulate_PSA_process_with_Aspen_adsorption_primmitive_Aspen_ADSIM_I_need_some_tutorial_files_for_this_software_is_there_anyone_helps_me/attachment/59d64c3779197b80779a6125/AS%3A483636639211520%401492319368809/download/Intoduction+Aspen+Adsorption_ES288.071.07.pdf
Hello Lucas F. A. S. Zafanelli
Thank you so much. I eventually found out the same solution and applied 'User_submodel'; where I wrote my own customized Isotherm equations something similar to what you presented in your reply.
I thank you for your kind and detailed reply.
Also, thank you everyone who replied to my questions. Thank you again for your precious time and supports.
Kind regards,
So-mang Kim