Competitive-consecutive reaction concentration effect

Once the reaction is established, three key factors must be addressed for successful development and scale-up of homogenous reactions 1) the effect of concentration on yield for competitive-consecutive reactions 2) the effect of feed rate or addition time on yield and 3) feed pipe backmixing. 

The use of a single reaction requires the online measurement of the local species concentration along the flow. With such systems, one experiences the main drawback of physical methods with the local measurement and the influence of the probe size on the mixing quality estimation. For that reason, the so-called test reactions are very attractive. Two main systems, based on competitive chemical reactions, have been proposed for the investigation of mixing effects, that is, the competitive consecutive reaction system (Scheme 6.1) and the competitive parallel reaction system (Scheme 6.2). Let us consider the following simplest reactions schemes which do not exactly match the published real systems, but which facilitate the comparison ... 

Figure 11-5 Concentration profiles for a consecutive-competitive reaction showing the effect without (a) and with (b) the crystallization of the desired product, R, and the resulting change in overreaction to S.

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