Jet loop reactors are standard multiphase reactors used in chemical, biological and environmental processes. The strong liquid jet provided by a nozzle enforces both internal circulation of liquid and gas as well as entrainment and dispersion of the gas phase. We present a one-dimensional compartment model based on a momentum balance that describes the internal circulation of gas and liquid phase in the jet loop reactor. This model considers the influence of local variations of the gas volume fraction on the internal circulation. These local variations can be caused by coalescence of gas bubbles, additional gas-feeding points and gas consumption or production. In this work, we applied the model to study the influence of a gas-consuming reaction on the internal circulation. In a comprehensive sensitivity analysis, the interaction of different parameters such as rate of reaction, power input through the nozzle, gas holdup, reactor geometry, and circulation rate were investigated. The results show that gas consumption can have a significant impact on internal circulation. Industrially relevant operating conditions have even been found where the internal circulation comes to a complete standstill.
Smartphones sind aus unserem Alltag nicht mehr wegzudenken ‐ ihre Produktion aber verschlingt Unmengen an Energie und Rohstoffen und am Ende stehen Berge von Elektroschrott. Beim Studierenden‐Wettbewerb chemPLANT der kreativen jungen Verfahrensingenieure (kjVI) der VDI‐GVC präsentierten die Teilnehmer zukunftsweisende Lösungsansätze für diese aktuelle Herausforderung. Das Team der TU Kaiserslautern überzeugte mit seinem zukunftsweisenden Konzept zum Smartphone‐Recycling mittels Bioleaching unter Berücksichtigung sozialer Aspekte.
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