040709_hw2

# 040709_hw2 - Department of Chemical Engineering University...

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1 Department of Chemical Engineering Spring, 2009 University of California, Santa Barbara CHE 140A Problem Set No. 2 Due Tuesday, April 14, 2009 Problem 1: Fogler, 1-15(a-c), p. 33 The reaction AB ⎯⎯→ is to be carried out isothermally in a continuous-flow reactor. Calculate both the CSTR and PFR reactor volumes necessary to consume 99% of reactant A (i.e., 0 0.01 AA CC = ) when the entering molar flow rate is 5 mol/h, assuming the reaction rate A r is: (a) A rk −= with k = 0.05 3 mol hdm (b) C with k = 0.0001 s -1 (c) 2 C with k = 3 3 dm h mol The entering volumetric flow rate is 10 dm 3 /h. Note: . FC v = For a constant volumetric flow rate 0 vv = , then 0 . v = Also, 00 0 / CF v = = [5 mol/h]/[10 dm 3 /h] = 0.5 mol/ dm 3 . Problem 2: The reaction A B has a reaction rate coefficient of k = 0.01 sec -1 . For C A0 = 2.0 moles/liter, what time is required for 90% conversion in a constant-volume batch reactor? Compared to 99% conversion? Compared to 99.9% conversion? Problem 3: Levenspiel, 3-21, p. 90 Find the first-order rate constant for the disappearance of A in the gas-phase reaction 2 AR

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## This note was uploaded on 12/29/2011 for the course CHE 140b taught by Professor Ceweb during the Fall '10 term at UCSB.

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040709_hw2 - Department of Chemical Engineering University...

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