Chemical Engineering Volume 3, Third Edition: Chemical and by D G Peacock, J.F. Richardson

Chemical Engineering

By D G Peacock, J.F. Richardson

The book of the 3rd version of 'Chemical Engineering quantity three' marks the finishing touch of the re-orientation of the elemental fabric inside the first 3 volumes of the sequence. quantity three is dedicated to response engineering (both chemical and biochemical), including dimension and procedure regulate. this article is designed for college students, graduate and postgraduate, of chemical engineering.

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G. 17 in finite difference form is 3,= - AC,,/At), the difference may be obtained with sufficient accuracy. Continuous stirred-tank reactors do not suffer from this disadvantage; by operating in the steady state, steady concentrations of the reactants are maintained and the rate of reaction is determined readily. If the rate equation is to be employed in its integrated form, the problem of determining kinetic constants from experimental data from batch or tubular reactors is in many ways equivalent to taking the design equations and working backwards.

E. I m3 of reaction mixture. 3a .. ( T -To)= 1 5 . 6OC. e. 2. 2. 80, we find that the required reaction time approximately 720 s = 12 min. 7. TUBULAR-FLOW REACTORS The tubular-flow reactor (Fig. lb) is chosen when it is desired to operate the reactor continuously but without back-mixing of reactants and products. In the case of an ideal tubular reactor, the reaction mixture passes through in a state of plug pow which, as the name suggests, means that the fluid moves like a solid plug or piston.

Variou configuratic 3 for ubular reacto , Simple cylindrical shell: suitable only if packed with catalyst (b) Shallow cylinder giving low pressure drop through catalyst bed (c) Tubes in parallel: relatively low tube velocity (d) Tubes in series: high tube velocity (a) departures from plug flow. With packing in the vessel, such movements are damped out and the simple cylinder is then quite suitable for catalytic reactions where no heat transfer is required. If pressure drop is a problem, the depth of the cylinder may be reduced and its diameter increased as in Fig.

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