An mixture of 55 mol% ethanol in n-propanol is at 0.2MPa and 80C at 70 mol/s. The

Question:

An mixture of 55 mol% ethanol in n-propanol is at 0.2MPa and 80°C at 70 mol/s. The stream is fed to a adiabatic flash drum. Calculate the outlet stream flow rates, temperatures, and compositions.

(a) Use the path of Fig. 2.6(a). V L TR = 25C 50C T V 25 50 +char AHvap Tb L HV - ckar-AHVOP = + (a) Enthalpy of vapor at 50 C using liquid

(b) Use the path of Fig. 2.6(c).

20C TR 25C V V -AHvap using e.g., Eqn. 2.45 I! Tb T H = 20 cdT - AHvap 25 20C (c) Enthalpy of liquid at 20°C using vapor ref at 25°C and generalized correlation for ΔH^Vap.