The exam loves to ask: "If you see 'Solids present in liquid stream', what does this mean?" Knowing the meaning of the 15 most common HYSYS warnings will cover 10% of the exam.
Question: You are simulating a natural gas dehydration unit using Triethylene Glycol (TEG). Which Property Package is most appropriate for this simulation to accurately model the water solubility in the hydrocarbon phase and the glycol equilibrium?
Answer: C (or specifically the Amine/Glycol enhanced packages). Standard Peng-Robinson often fails to model the polar interactions of water and glycol correctly.
Given a feed of 100 kmol/h methane and 50 kmol/h ethane at 10 bar, 25 °C, calculate the molar flow and mole fractions for the combined stream.
Explain when to choose Peng–Robinson vs. ideal‑gas or activity‑coefficient models.