Using the enthalpy-concentration diagram of Figure 7.37, determine the following for a mixture of n-hexane (H) and n-octane (O) at 1 atm: 

(a) Temperature and compositions of equilibrium liquid and vapor resulting from adiabatic mixing of 950 lb/h of a mixture of 30 mol% H in O at 180°F with 1,125 lb/h of a mixture of 80 mol% H in O at 240^οF; 

(b) Energy required to partially condense, by cooling, a mixture of 60 mol% H in O from an initial temperature of 260°F to 200°F. What are the compositions and amounts of the resulting vapor and liquid phases per lbmol of original mixture? 

(c) If the vapor from part (b) is further cooled to 180°F, determine the compositions and relative amounts of the resulting vapor and liquid.

Transcribed Image Text:

Enthalpy, Btu/lbmol x 103 30 20 10 IH --- P= 1 atm 240 °F G A 0.2 B 220 °F 200 °F 300°F 280 °F 260 °F Saturated vapor Saturated liquid 180 °F 140 °F 120 °F 100 °F 0.4 0.6 Mole fraction of n-hexane, x or y 0.8 Figure 7.37 Enthalpy-concentration diagram for n-hexane/ n-octane. 160 °F ✓ 1.0