What about using that thermodynamics at minus 40 degrees?
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For the separation process of only light hydrocarbons within C5. The system is moist. When the temperature is below 40 degrees underground, during the oil washing process, a product water decant stream is required but it is missing on tray 1. Please verify whether there is an issue with the thermodynamics settings chosen. Is it a problem with the thermodynamics selection?
The system contains water, and models that support VLL vapor-liquid-liquid equilibrium or VLW vapor-liquid free level equilibrium are required; see the help document on the selection and application of thermodynamic methods