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Unit operation models

A comprehensive collection of chromatographic unit-operation models is provided through the Python-based tool CADET-Equations The tool provides a graphical interface and allows users to export the corresponding governing equations in LaTeX or PDF format. The application is currently hosted on streamlit and is planned to be integrated into the CADET website in the future.

A short comparison of the most prominent unit operation model features is given in Table 1.

Table 1 Supported features of the different unit operations models

Unit operation model	Radial dispersion	Pore diffusion	Film diffusion	Particle geometries	Multiple particle types
General rate model (GRM)	×	✓	✓	✓	✓
Lumped rate model with pores (LRMP)	×	×	✓	✓	✓
Lumped rate model without pores (LRM)	×	×	×	×	×
Two Dimensional General rate model (GRM2D)	✓	✓	✓	✓	✓
Continuous stirred tank reactor model (CSTR)	×	×	×	×	✓
Multichannel Transport model (MCT model)	×	×	×	×	×
Crystallization / Precipitation Models	×	×	×	×	×

Moreover, the pseudo unit operations Inlet, and Outlet act as sources and sinks for the system. We further note that radial flow model variants are available for the LRM, LRMP and GRM.