Two perfectly mixed vessels of 10 liters each and both at 1 atm and 120 °C are respectively filled with n-butanol C4H9OH and air. At time t = 0, the two vessels are via a pipe connected to each other at 120 °C and 1 atm. This pipe has a length of 10 cm and a diameter of 1 cm. No reaction occurs during the mixing of the gases. All performing gas phases are assumed to be ideal. For the calculation of the molecular diffusivity, the Fuller's equation used. How long does it take for the partial pressure of n-butanol in the air vessel to reach 0.01 atm (in h)? Hints for the second part: - at any time point (so also at t= 0) forms the formula derived in the course for equimolar counter-diffusion under steady state conditions is a good approximation for the occurring flux. - at any time holds that c(butanol, vessel 1) = 31 mol/m3 - c(butanol, vessel 2) with the two concentrations in mol/m3 answer: t = 2.45 h

Consider the reaction below to be at equilibrium: 4 A(e) + 3 B(e) + heat 5 Ce) + 3 D(e) In which direction will the reaction shift if more D is added? O It will not shift O It will shift toward the products. O It will shift toward the reactants.

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A separation stream off the main reactor effluentcontains almost exclusively ethyl benzene,benzene, and toluene at 1 bar and 100°C. You determinethat the stream flow rate is made up of34 kg/s of benzene, 10 kg/s of toluene, and 57.75kg/s of the other component. You send this mixtureinto a flash distillation unit operating at 0.6bar and 100°C.A. Estimate if this mixture flashes.B. If the mixture flashes, determine the compositionand amount of the equilibrium liquid andvapor.C. You send the liquid exiting the flash distillationunit into another flash distillation unitoperating at 1.5 bar and 140°C. Determineif this mixture flashes. If so, determine thecomposition and amounts of the equilibriumphases.D. What percentage of the original benzene thatleft the reactor is now a vapor (you have to considerboth flash units).