Trennleistungen von strukturierten Packungen im Miniplant- und Technikumsmaßstab (Volume 59) (English shop)

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This dissertation investigates, experimentally and by means of modelling, the separation efficiency and pressure drop of non-perforated, microstructured packings in distillation columns from miniplant to pilot scale. The focus lies on the influence of column diameter, of edge and wall effects, and of fluid dynamics on separation efficiency. Experimental investigations with various material systems show that existing mass transfer models have so far taken diameter-dependent effects and scale-up into account only inadequately.

The results demonstrate that separation efficiency changes markedly with increasing column diameter and that edge phenomena, wall wetting and load effects play an important role, particularly in smaller columns. In addition, the investigations reveal differences between organic and aqueous mixtures as well as between vacuum and atmospheric conditions. The comparison of established mass transfer models makes clear that their predictive accuracy varies considerably depending on the material system.

On the basis of the experimental data obtained, an extended modelling approach was developed which takes into account load-dependent correction functions as well as edge gap, wall wiper and wall effects. This made it possible to improve the prediction of separation efficiency and to enable a more reliable transfer of measurement data to larger pilot-plant and industrial scales. The work thus contributes to optimising the design and scale-up of distillation columns.