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Fakultät BCI

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

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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

  • Riemer, T. B., P. Lapac, P., Vogt, D., Seidensticker, T., (2023) "Stable and Continuous Production of Amines via Reductive Amination in a Green Switchable Solvent System with Efficient Water Removal" ACS Sustainable Chem. Eng. 11, 12959–12966, DOI: 10.1021/acssuschemeng.3c02320
  • 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