Seeking help with the selection of gas absorption model methods and the fitting of binary interaction parameters
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I have been using Aspen to simulate the process of DMF absorbing acetylene recently. ASpen lacks parameters for the interaction between these two. Gas-liquid equilibrium data were retrieved from databases, and various models such as NRTL, Wilson, UNIQUAC, and SRK were tried for fitting, but none were successful (as indicated by high standard deviations and high root-mean-squares values). I urgently need advice from experienced forum members! Additionally, if the operating temperature is around -20 degrees and the pressure is above 10 bar, are there any special requirements when selecting the property calculation methods?
First, consider how wide your temperature and pressure range is; most of the models you choose have limitations on either the pressure or temperature range they can operate within. As for low temperature and high pressure with weak polarity, PR or SRK will suffice.
These two worked fine as well. Is there any information available regarding the temperature range of application in these models? I checked Aspen’s help files, but it doesn’t seem to have any specific instructions.