Modelling flow and mass transfer of thermal separation equipment constitutes one of the most challenging tasks in fluids process engineering. The difficulty of this task comes from the multiscale multiphase flow phenomena in rather complex geometries. Both analysis of flow and mass transfer on different scales as well as validation of models and simulation results require advanced experimental and measurement techniques. As a follow-up to intensive discussions during the 2019 Tutzing Symposium ''Separation Units 4.0'' a wide set of available modern experimental technologies is presented.

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Although the absorption of formaldehyde is a crucial stage within its production process, the number of models available in the literature is limited. The complexity of the absorption of formaldehyde in water, in which chemical reactions in the liquid phase are combined with multicomponent mass transfer, makes the development of an adequate process model a challenging task. In this work, a rate-based model of an industrial absorption system for tray and packed columns was developed. The multicomponent mass transfer was described based on the two-film theory, and the model was implemented in the simulation tool gPROMS ModelBuilder 5.1.1 and validated against data from the design flowsheet provided by the industrial unit licensor and typical operation values measured in an industrial formaldehyde production unit. The simulation results were in good agreement with the expected data. With the validated model, the influence of some operating parameters on the column behavior was studied.

Die Kenntnis des dynamischen Prozessverhaltens im Bereich der chemischen Absorption ist für die Vermeidung von Stör‐ und Notfallsituationen unerlässlich. Daher wurde in dieser Arbeit ein Rate‐based‐Modell zur dynamischen Simulation entwickelt und validiert. Als Beispiel wurde die reaktive Absorption von Kohlenstoffdioxid mit wässriger Monoethanolaminlösung modelliert. Anschließend wurden mit diesem Modell Sprungantworten für Änderungen einzelner Eintrittsgrößen in einer Absorptionskolonne im industriellen Maßstab simuliert. Mithilfe dieser Sprungantworten können schnelle vereinfachte Modelle entwickelt werden, die zur Vorbeugung von Störfällen in Echtzeit verwendet werden können.

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