Microwave-assisted continuous flow synthesis on industrial scale

Roman Morschhäuser 1 , Matthias Krull 1 , Christoph Kayser 1 , Cornelia Boberski 2 , Ralf Bierbaum 1 , Peter A. Püschner 3 , Toma N. Glasnov 4  and C. Oliver Kappe 4
  • 1 Clariant Produkte Deutschland GmbH, D-65926 Frankfurt/Main, Germany
  • 2 Innoturn GmbH, Unter den Eichen 2, D-65779 Kelkheim, Germany
  • 3 Püschner GmbH and Company KG, Steller Heide 14, D-28790 Schwanewede, Germany
  • 4 Christian Doppler Laboratory for Microwave Chemistry (CDLMC) and Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, A-80010 Graz, Austria


A continuous flow microwave system based on a transmission line short-circuited waveguide reactor concept is described. The continuous flow reactor is capable of operating in a genuine high-temperature/high-pressure process window (310°C/60 bar), applying a microwave transparent and chemical resistant cylindrical γ-Al2O3 tube as reaction zone. The system can be operated in an extremely energy efficient manner, utilizing 0.6–6 kW microwave power (2.45 GHz). The application of the reactor for processing four chemical transformations in a high-temperature/high-pressure regime with a throughout of 3.5–6.0 l/h is demonstrated.

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Green Processing and Synthesis (GPS) is a bimonthly, peer-reviewed journal that provides cutting-edge, up-to-date research both on fundamental as well as applied aspects of innovative green process development and chemical synthesis, giving an appropriate share to industrial views. GPS is a platform for chemists and chemical engineers but also open for interdisciplinary research from other areas such as physics, materials science, or catalysis.