Otto Roelen (22 March 1897 – 30 January 1993) was a German chemist.
Roelen was born in Mülheim, Germany and studied chemistry and graduated in 1922 from Technische Hochschule Stuttgart. He worked with Franz Fischer and Hans Tropsch at the Kaiser Wilhelm Institute for Coal Research from 1922. He developed the homogeneously catalysed hydroformylation process (also known as the "oxo synthesis") for the industrial synthesis of aldehydes from alkenes and carbon monoxide.
During the second world war he was chief chemist for Ruhr Chemie, and after the war he described the construction, operation and yields of oxo synthesis plants in detail to British Department of Scientific and Industrial Research interrogators.
- Boy Cornils, Wolfgang A. Herrmann, Manfred Rasch (1994). "Otto Roelen, Pioneer in Industrial Homogeneous Catalysis". Angewandte Chemie International Edition in English 33 (21): 2144–2163. doi:10.1002/anie.199421441.
- "B.I.O.S. Final Report No 1038 - Ruhrchemie A.G. Sterkrade-Holten, Near Oberhausen, Ruhr". Fischer-Tropsch Archive. 1946. Retrieved 2009-03-26.
- "British Intelligence Objectives Sub-Committee Reports". Fischer-Tropsch Archive. 1945-6. Retrieved 2009-03-26. Check date values in:
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