In series with CSTRs

Continuous tubular reactors can also he used to produce emulsion polymers. Such reactors have been used in series with CSTRs (Gonzalez, 1974), as how-through reactors (Rollins et nl., 1979 Ghosh and Forsyth, 1976) and in a ccaitinuous loop process (Lanthier, 1970) in which material is fed and removed from a tubidar loop with a circulating flow greater than the throughput. 

A tubular prereactor, in series with CSTR system, can offer stability advantages, which will he discussed later. A number of other flow alternatives are also possible with a CSTR-series system but these alternates are not widely utilized. An obvious flow alternative for a reactor system consisting of a series of CSTRs would he to introduce some portion of the total recipe at places other than the front end of the reactor train. These intermediate feeds would, in many respects, be analogous to semicootinuous operation of batch reactors. 

Figure 6.8 Construction of the attainable region for the van de Vusse reaction (a) PFR trajectory from C(0) = [1, 0] (solid line), with mixing line (dotted line) (b) CSTR trajectory from C(0) = (1, 0] (dashed line) (c) addition of bypass to CSTR (dotted line) (d) addition of PFR in series with CSTR (dot-dashed line).

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