Acetone Absorber HenrysLaw

[rhsrxs]

I was attempting to take the Acetone Absorber Henrys Law example in Chemsep and put into a COCO flowsheet. After several warnings I get "failed to solve unit Column_1. Flash (PVF) failed on bottom product" Attached is the fsd. Any help would be appreciated.

[rhsrxs]

Had to add activity coefficients to property package. If I go and zero out the undefined NTRL parameters I get the simulation to solve.

[jasper]

Sorry for the delay in responding; I was travelling.

The property package uses Peng Robinson, not NTRL. Is this intended? Why are you using different thermo in the column than in the flowsheet?

[rhsrxs]

I changed the COCO property package to NTRL. I then did a comparison of COCO and ChemSep. The only real major difference I came up with was the reported liquid discharge temperature of Column 2. COCO reports a temperature of 56.9216 °C. If you call up the ChemSep GUI the temperature of 33.4175 °C is reported.

This was basically an academic exercise to learn more about COCO and how to become more effective in its use.