Model 3 The Ideal Semicontinuous Stirred Tank Reactor SCSTR with V Variable

3 Model 3 The Ideal Semicontinuous Stirred Tank Reactor (SCSTR) with V = Variable 

In this case, dV/dt 0 (see Fig. 3.36) and therefore Equ. 3.87b remains entirely valid. For the calculation of a continuous feed operation as shown in Fig. 3.33, 

Fjn is a constant and is zero. In the case of an additional feed according to Equ. 3.86a, with = 0 but 0, then Equ. 3.87b can be rewritten to arrive at Equ. 3.92 as the mass conservation equation for the SCSTR with variable volume 

For the case of a growth process, using Equ. 2.5a for the rate of growth and with Xin = 0, one obtains (Dunn and Mor, 1975) 

This equation describes the quasi-steady state in which this type of addition process can be maintained for some time D = fi), as shown in Fig. 3.37 with simple Monod kinetics. 

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