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Abstract: The KoPPonA 2.0 project focuses on the translation of the continuous mode of operation for polymerizations inside milli-structured apparatuses with mixing elements. Such reactions with multiple consecutive reactions are strongly affected by the local hydrodynamics. Dead zones as well as regions close to the wall promote higher local residence times and thus the formation of fouling deposits, which leads to blocking. Hence, the description of the local hydrodynamics and flow phenomena is crucial for a suitable reactor model. The compartment modeling approach offers a promising way to describe such problems with complex geometries and kinetics. Based on the results of a CFD simulation with the mean-age theory, the CFD cells are clustered with respect to the local mean-age to convert the CFD mesh into a cascade of CSTRs, which still represents the spatial resolution but lowers the computational demand significantly. The derived compartment model is compared with the CFD in terms of mixing characteristics for single mixing elements. A comparison with respect to the results of an oligomerization in both models is executed. The derived method is applicated to a larger geometry and a parameter study is performed.