Scale-up in plug-flow reactors: Laminar feed

Similarity parameters are derived to correlate the selectivity of mixing co ntrolled parallel reactions within plug-flow reactors with two types of sta tic mixing elements for both aqueous and viscous solutions. For the case of laminar reactor feed, the Kolmogoroff time is shown to correlate selectivi ty in turbulent reactors provided the reactor Reynolds number Re < Re-C. Th e upper limit Re-C for the reactor Reynolds number is constrained by the ra tio of reactant feed-to-total volumetric flow rate. Moreover for larger rea ctor Reynolds number Re > Re-C, the inertial time scale defined in terms of a reactor feed length correlates selectivity. Scaling laws are derived for both reactor diameter and length and suggestions are made for predicting s electivity with larger turbulent feed rates.