Based on the mode of reactor operation, reactors may be:
- Plug Flow
- Continuously Stirred
Continuously operating reactors are also further subdivided on the basis of their homogeneity.
As enumerated by Missen et al. (1999)
- Each batch is a closed system
- The total mass of each batch is ﬁxed
- The volume or density of each batch varies (w.r.t time)
- The energy of each batch varies (w.r.t time)
- The reaction (residence) time t for all ements of a ﬂuid is the same.
- The operation of the reactor is inherently in the unstead-state (eg. composition w.r.t time)
- The batch is uniform due to efﬁcient stirring (composition, temperature .etc)
Missen, R.W., R.W. Missen, C.A. Mims, and B.A. Saville. 1999. Introduction to Chemical Reaction Engineering and Kinetics. v. 1. Wiley. https://books.google.co.in/books?id=X79TAAAAMAAJ.