Problems with physical property methods

I am also learning the *physical property methods; let me translate this: “The activity coefficient model GMUFPSRK lacks parameters: the UNIFAC group structure information parameter for component HCL is missing. Users need to provide this parameter, as there are no default values available in the Aspen database.” ” I think it might be necessary to set the missing parameters in properties--molecular structure. Hope this can help ^_^

In some cases, when using equations of state in software, it is necessary to enter interaction parameters or other parameters manually. For beginners, it is advisable to use commonly used equations of state, thereby avoiding issues related to missing parameters that could prevent the program from running. You can compare how simulating a set of components using several similar equations of state yields results that are not very different

Equation of state starting with P are generally predictive, and conventional components are usually not used under non-severe conditions

In the simulation calculations being carried out now, for HCl, phosgene, and TDI in the system, the PSRK equation is being used based on a BKP file imported from abroad; after checking, Aspen does not have any functional group parameters for these three substances. I then checked all the input parameters in the BKP file that was brought back, but couldn’t find any such inputs; I’m not sure how the calculation is done

It’s possible that the Binary Interaction under Properties/Parameters hasn’t been filled in; just click on it

You still haven’t made this question clear; we don’t know what components you are simulating, so how can we determine which property methods to use? So you need to tell us first what you are simulating and what modules you are using. Then consider what physical property methods should be used. The problem you are facing now is an error in the physical property method. Maybe you shouldn’t use the PSRK method after all/

Since the project involves confidentiality, it’s not possible to bring out the BKP file; otherwise I would have attached it so that everyone could help figure out what’s going on. The main components in this system are HCL, phosgene, CO2, N2, Co, chlorobenzene, and TDI. Since the operating pressure exceeds 20 kilograms, it’s necessary to use an equation of state. At first I used the SRK equation, but the results obtained from simulations differed greatly from the actual data. Eventually, I got a BKP file from abroad, in which they used the PSRK equation (with very low levels of CO2 and N2). So I decided to use the PSRK equation as well, but after running the simulation, the same error messages appeared as before. I then checked the binary interaction parameters; there was a UFGRP term, but no functional group parameters for HCL, phosgene, or TDI were available there. The BKP file from abroad also didn’t contain parameters for these substances, yet their file could run successfully, while using the PSRK equation myself resulted in errors. I’m not sure what’s going on. I wonder if I’ve explained the problem clearly enough

Please confirm whether the software version and the choice of material property database are consistent with those used by foreigners

First, figure out the missing parameters, then look up information to find them, enter them into a+, and finally perform the calculation. 8# wangyizjz

It is also possible to compare item by item with foreign bkg files to identify the differences.