Model 5 The Real Plug Flow Reactor CPFR with Dispersion

5 Model 5 The Real Plug Flow Reactor CPFR WITH Dispersion 

The quantification of real reactors, those with deviations from ideal plug flow, can now also be undertaken. In agreement with Equ. 3.3a, in addition to the convection term operating via the flow velocity the term with the dispersion coefficient J9l is also operative. 

The conservation of mass equation for this situation, which is directly applied in modeling tube reactors (F. Moser, 1977) and bubble columns (Reuss, 1976), is thus identical to Equ. 3.3a. These types of one-dimensional one-phase models are not only necessary for calculating conversion They are also very useful in, for example, calculating the /cl value of a reactor with a concentration profile  

In the steady state, for the actual determination of /cl a one needs not only the experimental measurement of the O2 concentration along the length of the reactor one also needs to know the dispersion coefficient, which can be obtained from Equ. 3.4 in Sect. 3.3.1, and, for stationary method. Sect. 3.3.3, Liicke, Oels and Schiigerl, 1977). 

The types of models described thus far have already been characterized as one-dimensional one-phase models. This means that only a single coordinate (the z axis) is considered in reality, in the case of, for example, flow in a tube, processes occurring in a radial direction (coordinate R) can also be of importance. 

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