Chapter 14, Problem 14.2Q

Sulphur dioxide is absorbed in a packed bed absorption tower with 25 mm ceramic Intalox saddles (packing factor of 300 m) using water solvent in a countercurrent arrangement. The feed gas contains 0.05 kmol SO-/kmol air, and it is desired to reduce the SO, content of exit gas to 3% of its inlet concentration. The gas flow rate is 0.067 kmol's of air, and the water rate is 3,08 kmol/s. The equilibrium relation is given by: Y= 30 X. Calculate: (a) number of transfer units; (b) column diameter, (c) the height of the packing. Assuming the entire process is gas-film controlled. Design for a pressure drop of 21 mm H-O/m packing. P = 1.21 kg/m: p = 1000 kg/m³: д, = 0.018×10-3 N.s/m² = 10³ N./m²; D₁ =1.45x10 m³/s; D₁ = 1.7x10m²/s. H=0.011, (Sc)( 0.305 111 De 2 3.05) 035 H₁ = 0.305 (Sc) K (305)

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Generalized Machine Theory Attempt ALL Questions. Q1. (a) Explain and illustrate the object of the performance analysis of any type of machine by unified theory. [8M]

P10-21 When the impurity cumene hydroperoxide is present in trace amounts in a cumene feed stream, it can deactivate the silica-alumina catalyst over which cumene is being cracked to form benzene and propy- lene. The following data were taken at 1 atm and 420°C in a differential reactor. The feed consists of cumene and a trace (0.08 mol %) of cumene hydroperoxide (CHP). Benzene in Exit Stream (mol %) 1 (8) 2 1.62 1.31 1.06 0.85 0.56 0.37 0.24 0 50 100 150 200 300 400 500 == (a) Determine the order of decay and the decay constant. (Ans.: kg 4,27 x 10-3 s) (b) As a first approximation (actually a rather good one), we shall neglect the denominator of the cat- alytic rate law and consider the reaction to be first order in cumene. Given that the specific reac- tion rate with respect to cumene is k = 3.8 X 103 mol/kg fresh cat s atm, the molar flow rate of cumene (99.92% cumene, 0.08% CHP) is 200 mol/min, the entering concentration is 0.06 kmol/m³, the catalyst weight is 100 kg, and the…

ICG Heterogeneous Catalysis Performance P10-3 t-Butyl alcohol (TBA) is an important octane enhancer that is used to replace lead additives in gasoline [Ind. Eng. Chem. Res., 27, 2224 (1988)]. TBA was produced by the liquid-phase hydration (W) of isobutene (I) over an Amberlyst-15 catalyst. The system is normally a multiphase mixture of hydrocar- bon, water, and solid catalysts. However, the use of cosolvents or excess TBA can achieve reasonable miscibility. The reaction mechanism is believed to be Derive a rate law assuming: I S (P10-3.1) I+S W.S (P10-3.2) WSZ W S+I SE TBA S+S (P10-3.3) TBA SZ TBA + S (P10-3.4) (a) The surface reaction is rate-limiting. (b) The adsorption of isobutene is limiting. (c) The reaction follows Eley-Rideal kinetics I SW TBA S (P10-3.5) and the surface reaction is limiting. (d) Isobutene (1) and water (W) are adsorbed on different sites. T + S₁ W + S₂ W. S₂ TBA is not on the surface, and the surface reaction is rate-limiting. Ans.: TBA=-= [CCW-CTBA/K]…

of cat- The cat- metric ength wate)? of the nds? the rate law is h. Redo parts (b) and (c) for these conditions. P10-20, The vapor-phase cracking of gas-oil in Example 10-6 is carried out over a different catalyst, for which would you recommend? with '=5x10-5 kmol kg-cat-s-atm (a) Assuming that you can vary the entering pressure and gas velocity, what operating conditions (b) What could go wrong with the conditions you chose? Now assume the decay law is da dt = kpacite with kp=100 dm³ at 400°C mol-s where the concentration, Cenke, in mol/dm³, can be determined from a stoichiometric table. (c) For a temperature of 400°C and a reactor height of 15 m, what gas velocity do you recommend? (d) The reaction is now to be carried in an STTR 15 m high and 1.5 m in diameter. The gas velocity is 2.5 m/s. You can operate in the temperature range between 100 and 500°C. What temperature do you choose, and what is the corresponding conversion? (e) What would the temperature-time trajectory look like…

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Generalized Machine Theory Attempt ALL Questions. Q1. (a) Explain and illustrate the object of the performance analysis of any type of machine by unified theory. [8M]