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Chemical Reaction Engineering
Introduction to Chemical Reaction Engineering and Kinetics
137 SOLVED PROBLEMS
Question: 19.10
Using the results from Example 19-3 for t and σθ² estimate values for Pe, for both open and closed boundary conditions, as far as possible, from (a) E(θ) and (b) the variance. ...
Verified Answer:
(a) From Example 19-3,
\bar{t} = 21.9 [/...
Question: 17.4
(a) Derive the equation for the RTD function E(θ) for constant-density flow of a fluid through two stirred tanks in series; that is, the flow in each tank is BMF. The volume of each tank is V/2, and the steady-state flow rate is q.(b) On the same plot,graphically compare the result from (a) (for N ...
Verified Answer:
(a) The flow diagram and symbols are shown in Figu...
Question: 15.7
A gas-phase reaction between butadiene (A) and ethene (B) is conducted in a PFR, producing cyclohexene (C). The feed contains equimolar amounts of each reactant at 525°C (T,) and a total pressure of 101 kPa. The enthalpy of reaction is – 115 kJ (mol A)-‘, and the reaction is first-order with ...
Verified Answer:
The reaction is
C_4H_6(A)+C_2H_4(B)\righta...
Question: 23.5
A first-order reaction, A → products, is conducted in a fluidized-bed reactor. Before fluidization, the bed is 1.8 m deep (Lpa), with a voidage (εpa) of 0.42. The feed gas (pf =0.45 kg m-³ ;μf = 4.2 X lo^-5 Pa s) flows through the bed at a velocity three times the minimum fluidization velocity. The ...
Verified Answer:
First, the minimum fluidization velocity (
...
Question: 23.4
(Kunii and Levenspiel, 1991, p. 298) Phthalic anhydride is produced in the following process: naphthalene (A) →^k1 phthalic anhydride (B) →^k2 CO2 + H2O The reaction occurs in a fluidized-bed reactor, with sufficient heat exchange to ensure isothermal operation. The bed (before fluidization) ...
Verified Answer:
To solve the problem, continuity equations are wri...
Question: 23.3
(a) Estimate the amount of catalyst (Wcat/kg) required for a fluidized-bed reactor, according to the Kunii-Levenspiel bubbling-bed model, for the production of 60,000 Mg year-¹ of acrylonitrile by the ammoxidation of propylene with air. Data and assumptions: The heat transfer configuration within ...
Verified Answer:
(a) To calculate
W_{cat}
, we use eq...
Question: 23.2
Calculate umf for particles of ZnS fluidized by air at 1200 K and 200 kPa. Assume d’p = 4 X lo^-4 m , mf = 0.5 , ρp = 3500 kg m-³, and μf = 4.6 X lo^-5 N s m-²; g = 9.81 m s-². ...
Verified Answer:
At the (T,P) conditions given, the density of air ...
Question: 23.1
Obtain the special forms of equation 23.2-5 for (a) relatively small particles, and (b) rela- tively large particles ...
Verified Answer:
(a) For relatively small particles, Re is relative...
Question: 22.5
A kinetics study of the reaction A(g) + 2B(s) → products (s, g) (problem 9-21) yielded the following values of parameters for 2-cm (diameter) spherical particles at 700 K and pA = 200 kPa : tl = 4.92 X lo^5 s; kAg = 9.2 X lo^5 m s-¹ ,kAs = 8.85 X lo^5 m s-¹; De = 8.37 X lo^-7 m² s-¹ For the value ...
Verified Answer:
Although it is possible to obtain analytical expre...
Question: 22.4
Extend Example 22-3 to examine the dependence of fB on t and the sensitivity to the type of rate-controlling process. For this purpose, using the data of Example 22-3, calculate and plot fB as a function of t over the range 0 to 25 min for each of the three cases in Example 22-3(a), (b), and (c). ...
Verified Answer:
For gas-film mass transfer control, we use equatio...
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