Question

A liquid stream and a vapor stream are fed to an adiabatic equilibrium stage where vapor and liquid streams leave. The compositions, flow rates, temperature, and pressure are known for the two feed streams. If we also specify the outlet temperature and pressure and we want to determine the compositions and flow rates of the outlet streams, will the problem be underspecified, overspecified, or solvable?

Answer 1

Answer:

The problem is solvable

Explanation:

The information that is provided, together with some equations are enough to  solve the problem:

• The inlet states are totally defined.
• A heat balance under adiabatic assumption, allows to calculate the outlet temperature (both outlets stream are in equilibrium, so at the same temperature).
• The rule of phases implies that por the two-phase equilibrium, there is only one pressure for each temperature.
• The mass balance and equilibrium relationships allows to calculate the res of properties for the outlet streams.