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M. Sc. Tim Riemer

Focus of work

  • Thermomorphic Multiphase Systems
  • Development of novel processes in a continuous miniplant
  • Upscaling of chemical reactions
  • Reductive Amination/Hydroaminomethylation

Follow the link to moodle to get further information about current student research projects:

Further Information about Tim Riemer

Curriculum Vitae

Tim Riemer studied Chemical Engineering at TU Dortmund since October 2013 and finished his bachelor thesis with the topic “Further development of a screening reactor concept using the hydroformylation as a model reaction” at the laboratory of industrial chemistry. During his master studies he attended a semester abroad at the Lappeenranta University of Technology (LUT) in Finland with the focus on chemical process modeling and membrane technology. He finished his studies with the master thesis “Design and Commissioning of a Continuous Jetloop Plant for Applications of Oleochemical Reactions”. Since February 2020 he works as a research associate at the Laboratory of Industrial Chemistry.

Research Topic

Homogeneous catalysis in comparison to heterogeneous catalysis is burdened by the use of a solvent, which makes catalyst recycle and product separation costly and difficult. This is probably one of the main reasons that industry prefers heterogeneous catalysis. Besides heterogenizing homogeneous catalysts, immobilization of the homogeneous catalysts in multiphase operation (e.g. two-liquid phase approach) offers promising opportunities. This research focus on the approach of thermomorphic multiphase systems (TMS) which utilizes the temperature dependency of the miscibility gap of the immobilized catalyst phase and the substrate phase to eliminate phase transfer limitations during reaction and enable an easy phase separation after reaction. (Figure 1). The research of thermomorphic multiphase systems is part of the Collaborative Research Center / Transregio 63 (CRC / TR 63) "Integrated Chemical Processes in Liquid Multiphase Systems" (InPROMPT), which is funded by the German Research Foundation (DFG).

Oben: Reaktion (Hydroaminomethylation): R-C=C ->(+CO/H2+Kat) R-C-C-CO-H [Hydroformylation] -> (+R2NH+H2+Kat) R-C-C-NR'R''-H [Reductive Amination] oder R-C=C ->(+CO/H2+R2NH+Kat) R-C-C-NR'R''-H [Hydroaminomethylation]

Publications & Conferences

  • Herrmann, N. , Bianga, J. , Palten, M. , Riemer, T. , Vogt, D. , Dreimann, J. M. , Seidensticker, T. (2020). "Improving Aqueous Biphasic Hydroformylation of Unsaturated Oleochemicals Using a Jet‐Loop‐Reactor". Eur. J. Lipid Sci. Technol. 122, 1900166, DOI: 10.1002/ejlt.201900166.
  •  July 2022, Lisbon, Portugal: 22nd International Symposium on Homogeneous Catalysis, Poster: "Multipurpose substrate switching with continuous catalyst recycling: Testing the robustness of a thermomorphic multiphase system for the hydroaminomethylation"

  • June 2022, Weimar, Germany: 55. Jahrestreffen Deutscher Katalytiker, Poster: "Hydroaminomethylation of renewables with continuous catalyst recycling via thermomorphic multiphase system".

  • May 2022, Dortmund, Germany: 11th Workshop on Fats and Oils as Renewable Resources for the Chemical Industry, Poster: "Hydroaminomethylation of oleochemicals in a continuously operated miniplant"

  • March 2021, Weimar, Germany, 54. Jahrestreffen Deutscher Katalytiker, "Reductive amination with continuous catalyst recycling via thermomorphic multiphase system"


links: Logo InPrompt SFB/Transregio 63; rechts: Logo DFG


Location & approach

The campus of TU Dort­mund University is located close to interstate junction Dort­mund West, where the Sauerlandlinie A 45 (Frankfurt-Dort­mund) crosses the Ruhrschnellweg B 1 / A 40. The best interstate exit to take from A 45 is “Dort­mund-Eichlinghofen” (closer to South Campus), and from B 1 / A 40 “Dort­mund-Dorstfeld” (closer to North Campus). Signs for the uni­ver­si­ty are located at both exits. Also, there is a new exit before you pass over the B 1-bridge leading into Dort­mund.

To get from North Campus to South Campus by car, there is the connection via Vogelpothsweg/Baroper Straße. We recommend you leave your car on one of the parking lots at North Campus and use the H-Bahn (suspended monorail system), which conveniently connects the two campuses.

TU Dort­mund University has its own train station (“Dort­mund Uni­ver­si­tät”). From there, suburban trains (S-Bahn) leave for Dort­mund main station (“Dort­mund Hauptbahnhof”) and Düsseldorf main station via the “Düsseldorf Airport Train Station” (take S-Bahn number 1, which leaves every 20 or 30 minutes). The uni­ver­si­ty is easily reached from Bochum, Essen, Mülheim an der Ruhr and Duisburg.

You can also take the bus or subway train from Dort­mund city to the uni­ver­si­ty: From Dort­mund main station, you can take any train bound for the Station “Stadtgarten”, usually lines U41, U45, U 47 and U49. At “Stadtgarten” you switch trains and get on line U42 towards “Hombruch”. Look out for the Station “An der Palmweide”. From the bus stop just across the road, busses bound for TU Dort­mund University leave every ten minutes (445, 447 and 462). Another option is to take the subway routes U41, U45, U47 and U49 from Dort­mund main station to the stop “Dort­mund Kampstraße”. From there, take U43 or U44 to the stop “Dort­mund Wittener Straße”. Switch to bus line 447 and get off at “Dort­mund Uni­ver­si­tät S”.

The AirportExpress is a fast and convenient means of transport from Dortmund Airport (DTM) to Dortmund Central Station, taking you there in little more than 20 minutes. From Dortmund Central Station, you can continue to the university campus by interurban railway (S-Bahn). A larger range of international flight connections is offered at Düsseldorf Airport (DUS), which is about 60 kilometres away and can be directly reached by S-Bahn from the university station.

The H-Bahn is one of the hallmarks of TU Dort­mund University. There are two stations on North Campus. One (“Dort­mund Uni­ver­si­tät S”) is directly located at the suburban train stop, which connects the uni­ver­si­ty directly with the city of Dort­mund and the rest of the Ruhr Area. Also from this station, there are connections to the “Technologiepark” and (via South Campus) Eichlinghofen. The other station is located at the dining hall at North Campus and offers a direct connection to South Campus every five minutes.

The facilities of TU Dortmund University are spread over two campuses, the larger Campus North and the smaller Campus South. Additionally, some areas of the university are located in the adjacent “Technologiepark”.

Site Map of TU Dortmund University (Second Page in English).