The usefulness of reactor combinations

Reactor combinations can be used either in a practical manner or in a more 'theoretical' sense:

• the practical application is: you can adapt the degree of back-mixing within the process in an adequate manner, - e.g. by the number of vessels or the 'rise or decrease' of the volume in a cascade, - or the recirculation factor in a loop reactor, - or the maintenance of a high initial back-mixing in a serial combination of a CSTR and a TFR. This option plays a big role when an optimization by controlling of concentration levels is necessary.
• The more theoretical (but with much significance in practice) application is the use in reactor design: You can 'model' a real rector with a combination of ideal reactors that exhibits the same RTD. Putting together and solving the material balance for the combination is one possibility of calculating real reactors.

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