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In my model I get the following error: System.Exception: NIST-MODFAC Error: Could not find interaction parameter for groups CH3OH / AC2O. Activity coefficient calculation will give you inconsistent results for this system. I want to ignore the missing parameters for simplicity reasons, and I'm not sure where I can disable this warning. Where in DWSIM can I do that? I only see an option for ignoring missing UNIQUAC/NRTL parameters

In my model I get the following error: System.Exception: NIST-MODFAC Error: Could not find interaction parameter for groups CH3OH / AC2O. Activity coefficient calculation will give you inconsistent results for this system. I want to ignore the missing parameters for simplicity reasons, and I'm not sure where I can disable this warning. Where in DWSIM can I do that? I only see an option for ignoring missing UNIQUAC/NRTL parameters

In my model I get the following error: System.Exception: NIST-MODFAC Error: Could not find interaction parameter for groups CH3OH / AC2O. Activity coefficient calculation will give you inconsistent results for this system. I want to ignore the missing parameters for simplicity reasons, and I'm not sure where I can disable this warning. Where in DWSIM can I do that? I only see an option for ignoring missing UNIQUAC/NRTL parameters

Hi Daniel, Thank you for your quick help. I tried regressing my experimental data using UNIQUAC. I attached the paper I got the VLE data from, for furfuryl alcohol and furfural. But I get a regression error that I don't understand. Could you take a look at this file and see what's generating the error? Thank you for all your help

For modeling purposes using the free software, would you suggest just ignoring the missing interaction parameters?

I found experimental VLE data that I can input for doing a Txy data regression for estimating the interaction parameters between furfuryl alcohol and furfural. When I tried using MODFACT-NIST to give an initial estimation, I get the following error "Could not find interaction parameter for groups CH3OH/AC2O. My confusion is that I didn't use either of those MODFAC groups to build my furfuryl alcohol compound. I wonder if this is why I couldn't get an initial estimation for the parameters on the Configure...

I built two compounds using MODFAC-Nist and Joback groups, and I hand calculated their UNIQUAC R and Q parameters. I'm trying to estimate the UNIQUAC interaction parameters between several compounds, including my built ones, in the Configure Property Package window. However, when I estimate the interaction parameters using the "Estimate MODFACT Nist" function, all interaction parameters involving my built compounds return a 0 value while compounds already in the DWSIM database have non-zero interaction...

A follow up to my original question, I tried importing my revised Furfuryl Alcohol.json file to replace the previously uploaded Furfuryl Alcohol compound, but I received the error message "the given key was not present in the dictionary." I'm not sure how to resolve this issue