Eos comparison

[Morayo12345]

I am modeling the phase behavior of a CO₂-N₂ mixture using Thermopack with PC-SAFT, SAFT, Peng-Robinson, and GERG-2008. While, get_binary_pxy works well at higher temperatures, such as 271.48 K and 293.4 K, it consistently fails at lower temperatures like 223.71 K and 241.33 K, returning the error: "binary_plot failed."

The system comprises 95% CO₂ and 5% N₂ with a binary interaction parameter Kij=-0.12. I have tested different Kij values and narrowed the composition range to avoid extremes, but the issue persists. Interestingly, phase envelope calculations using get_envelope_twophase work fine, even at low temperatures, suggesting the issue might be specific to get_binary_pxy. Could you please suggest any adjustments to solver settings, parameters, or other approaches to address this problem? Your guidance would be greatly appreciated.

Thank you,
Morayo