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For many synthetic processes in chemical production, solvents are crucial. Through the associated emissions their use represents a danger to health and environment, and is often associated with high consumption of materials and energy. The renunciation of solvents thus represents an essential option for process intensifcation. The Friedrich Schiller University of Jena, in cooperation with Zoz GmbH, Fritsch GmbH, the Technical University of Braunschweig, and Evonik Industries AG, has successfully tested solvent-free organic synthesis using planetary ball mills and highenergy ball mills, and has developed it further to practical maturity. The project’s goal was the investigation of solvent-free organic synthesis in planetary ball mills on a laboratory scale and the upscaling to a technical scale, with the help of the high-energy ball mill Simoloyer®, for later industrial use.