The dehydration butanol of alumina is carried out over a silica-alumina catalyst at 680 K.
The rate law is
with k = 0.054 mol/gcat•h•atm and KBu = 0.32 atm−1. Pure butanol enters a thin-tubed, packed-bed reactor at a molar flow rate of 50 kmol/hr and a pressure of 10 atm (1013•kPa).
- (a) What PBR catalyst weight is necessary to achieve 80% conversion in the absence of pressure drop? Plot and analyze X, p, f (i.e., (υ/υ0)) and reaction rate, −r′A, as a function of catalyst weight.
- (b) What “fluidized CSTR” catalyst weight is necessary to achieve 80% conversion?
- (c) Repeat (a) when there is pressure drop, with the pressure-drop parameter α = 0.0006 kg−1. Do you observe a maximum in the rate of reaction, and if so, why? What catalyst weight is necessary to achieve 70% conversion? Compare this weight with that for no pressure drop to achieve the same conversion.
- (d) What generalizations can you make about this problem?
- (e) Write a question for this problem that requires critical thinking and then explain why your question requires critical thinking. (Hint: See Preface Section I.2)
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ELEMENTS OF CHEM. REACTION ENGR
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