Prof. Kleine Jäger has rendered outstanding contributions to the development of solids process engineering in the chemical industry, its scientific foundations and its successful implementation in industrial practice. His very close cooperation with the School of Process Engineering of the TUHH deserves special mention.
Since summer semester 2018 he is holding the lecture "Feststoffverfahrenstechnik in der chemischen Industrie". Prof. Kleine Jäger is also member of the advisory board of the Collaborative Research Centre 1615 "Smart Reactors", which has been originally developed by the School of Process Engineering. He is also one of the speakers at the annual Professional Course Fluidization Technology, which takes place for the 17th time in November 2025 at TUHH, organized by Prof. Stefan Heinrich."
Prof. Kleine Jäger has also shown outstanding personal and financial commitment in supporting research work at TUHH. In particular, since 2013, he has cooperated with Prof. Heinrich's institute SPE in numerous industrial projects to finance doctoral students and supported them on topics such as the development of a continuous spouted bed technology, fluidised bed granulation, spray drying of individual droplets, zeolite production and the development of a dynamic flowsheet simulation system named Dyssol. Many of the PhD alumni from SPE started their industrial career at BASF in the group of Prof. Kleine Jäger.