In a preheater the feed solution of methanol and water with the molar fraction $$z^F = 0.25$$ and $$\vartheta$$ = 20 °C at $$p$$ = 1.013 bar is now heated isobaric with a molar heat of $$q$$ = 10 kJ/mol before it's added to the rectification column.
Determine the temperature $$\vartheta^F$$ and the caloric factor $$q^F$$ of the feed after preheating using the app. The molar heat capacities of the pure substances are assumed to be independent of temperature: - Methanol: $$c_{p,1}^L$$ = 85.01 J/(mol K) - Water: $$c_{p,2}^L$$ =75.47 J/(mol K) All enthalpies of the mixture are assumed to be linear combinations of the enthalpies of the pure substances, whereby the heat of mixing is neglected. | | |