A gas-phase reaction is being carried out in a 5-cm-diameter tubular reactor that is 2 m in length. The velocity inside the pipe is 2 cm/s. As a very first approximation, the gas properties can be taken as those of air (kinematic viscosity = 0.01 cm2/s), and the diffusivities of the reacting species are approximately 0.005 cm2/s.
(a) How many tanks in series would you suggest to model this reactor?
(b) If the second-order reaction A + B → C + D is carried out for the case of equimolar feed and with CA0 = 0.01 mol/dm3, what conversion can be expected at a temperature for which k = 25 dm3/mol • s?
(c) How would your answers to parts (a) and (b) change if the fluid velocity were reduced to 0.1 cm/s? Increased to 1 m/s?
(d) How would your answers to parts (a) and (b) change if the superficial velocity was 4 cm/s through a packed bed of 0.2-cm-diameter spheres?
(e) How would your answers to parts (a) to (d) change if the fluid were a liquid with properties similar to water instead of a gas, and the diffusivity was 5 X 10−6 cm2/s?
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