Tubular Chemical Reactors

This section is concerned with batch, semi-batch, continuous stirred tanks and continuous stirred-tank-reactor cascades, as represented in Fig. 3.1 Tubular chemical reactor systems are discussed in Chapter 4. 

Mathematical models of tubular chemical reactor behaviour can be used to predict the dynamic variations in concentration, temperature and flow rate at various locations within the reactor. A complete tubular reactor model would however be extremely complex, involving variations in both radial and axial... 

Chapter 4 eoncerns differential applications, which take place with respect to both time and position and which are normally formulated as partial differential equations. Applications include diffusion and conduction, tubular chemical reactors, differential mass transfer and shell and tube heat exchange. It is shown that such problems can be solved with relative ease, by utilising a finite-differencing solution technique in the simulation approach. 

M. Berezowski. Effect of delay time on the generation of chaos in continuous systems. One-dimensional model. Two-dimensional model - tubular chemical reactor with recycle. Chaos, Solitons Fractals, 12(l) 83-89, 2001. 

Computational methods for the tubular chemical reactor (with A. Varma, C. Georgakis, and... 

Mathematical models of tubular chemical reactor behaviour can be used to predict the dynamic variations in concentration, temperature and flow rate at various locations within the reactor. A complete tubular reactor model would however be extremely complex, involving variations in both radial and axial positions, as well as perhaps spatial variations within individual catalyst pellets. Models of such complexity are beyond the scope of this text, and variations only with respect to both time and axial position are treated here. Allowance for axial dispersion is however included, owing to its very large influence on reactor performance, and the fact that the modelling procedure using digital simulation is relatively straightforward. 

This chapter deals with equipment types that are of most interest to a process engineer tubular and plate exchangers condensers boilers and calandrias extended surface equipment mechanically aided heat-transfer devices and tubular chemical reactors. Evaporators are described in Chap. 16. Information on all types of heat-exchange equipment is given in engineering texts and handbooks.i -= °... 

Finally, the equilibrium criterion for a system consisting of an element of fluid moving with the velocity of the fluid around it is also of interest, as such a choice of system arises in the study of continuous processing equipment used in the chemical industry. The tubular chemical reactor discussed in Chapter 14 is perhaps the most common example. Since each fluid element is moving with the velocity of the fluid surrounding it, there is no convected flow of mass into or out of this system. Therefore, each such element of mass in a pure fluid is a system closed to the flow of mass, and consequently is subject to precisely the same equilibrium criteria as the closed systems discussed above (i.e., Eq. 7.1-5,7.1-10, or 7.1-12, depending on the constraints on the system). 

Mathematical models have been used to calculate concentration and temperature transients in a packed-bed tubular chemical reactor. Phenomena studied were thermal capacity of the packing, packing-to-fluid heat flow resistance, temperature concentration coupling through... 

Multiscale Modeling, Fig. 4 Tubular chemical reactor with transport and volume chemical reactions... 

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