The molar enthalpy of a binary liquid mixture of species 1 and 2 is given by:

where T is the temperature in [K]. This expression is valid in the temperature range from 280 K to 360 K. Please answer the following questions:

(a) You wish to dilute and cool a process stream containing 50 mol% species 1 and 50 mol% species 2. Consider the adiabatic mixing of a stream a (containing 50 mol% species 1 and 50 mol% species 2) with a molar fl ow rate of 2 mol/s at 75°C and 1 bar with a stream b of pure species 1 fl owing at a rate of 3 mol/s at 20°C and 1 bar. What is the exit temperature of the outlet stream?
You may assume steady-state.

(d) Would the fi nal temperature you calculate be higher or lower than that calculated in Part C if you didn’t include the “mixing” effects of the unlike interactions?

Transcribed Image Text:

h = 1500x800x2 + (25.0x+ 35.0x2 11.86x1x) T - mol