Sequence of stirred tanks

Figure 4.4 Stereospecific esterification synthesis of (/t)-/V-(fe/V-hutoxycarbonyl)-3-hydroxyinethyl-piperidine from (7 ,5)-A,-(/< r7-butoxycarhonyl)-3-hydroxy methyl piperidine applying a sequence of stirred-tank reactor, extraction module, second stirred-tank reactor and second extraction module... 

Figure 4.14 Chemical adducts for by-product removal synthesis of isopropyl-cis-Ag-hexadecanoate from isopropylpalmitate applying a repetitive batch process using a sequence of stirred-tank reactor, extraction module, filtration step and chromatographic downstream processing...

Studies in optimization-III The optimum operating conditions in sequences of stirred tank reactors. Chem. Eng. ScL 13, 75-81 (1960). 

Optimal bypass rates for sequences of stirred tank reactors Can. J. Chem. Eng. 39, 121— 126 (1961). 

If a stage of a reactor is insulated as far as possible from direct transfer of heat it is called adiabatic. Thus a sequence of stirred tanks 40... 

Fig. 3.3. Comparison of concentration and temperature profiles for a tubular reactor and sequence of stirred tanks. (Courtesy of N. R. Amundson.)...

With these particular examples before us we are in a position to give a general algorithm for optimal design in sequences of stirred tanks. The basic equations have been given in Section 3.2 and need not be derived again. They are ... 

GENERAL PROBLEMS WITH SEQUENCES OF STIRRED TANKS... 

Sequences of Stirred Tanks with Bypassing of the Feed Stream... 

In this section we shall study in detail the optimal choice of holding time and temperature in a sequence of stirred tanks in which a single exothermic reversible reaction is taking place. As soon as the word optimal is used the question must be asked, In what sense is the design to be optimal Here we shall only treat the simplest of optimization problems, but their interplay is instructive. 

More complicated problems for sequences of stirred tanks can be devised, but they follow the pattern of multibed adiabatic tubular reactors to which we now turn. 

The monomer feed is converted into Polyamide-6 by polycondensation and polyaddition reactions [930]. This reaction step can be realized by a complex reactor which can be modeled as a sequence of stirred tank and plug-flow reactors. An exemplary model flowsheet comprising two reactors (CSTR) with an intermediate water separation (Split) is shown in Fig. 5.20. Such a model of the reaction section can be analyzed by means of Polymers Plus, an extension of Aspen Plus for handling polymer materials [513]. 

---