Oxygen sensors for flow reactors-measuring dissolved oxygen in organic solvents

Philipp Sulzer, René Lebl, C. Oliver Kappe, Torsten Mayr*

*Korrespondierende/r Autor/in für diese Arbeit

Publikation: Beitrag in einer FachzeitschriftArtikel


In an effort to push the boundaries of optical oxygen sensors, this contribution shows the development of a measurement system for high O2 content in organic solvents specifically designed for flow reactors. Presented sensors were prepared by directly melting an oxygen indicator dye into a highly resistant polymer matrix, leading to the ability to measure oxygen contents up to 59 mmol L-1 in tetrahydrofuran, toluene, acetone, dimethylformamide, cyclohexane and methyl tert-butyl ether. Long-term effects to the solvent were investigated by exposing the sensors for 22 hours to the respective solvent at 25 °C. Linearity according to Stern-Volmer was obtained for every single sensor in order to provide a system that can be easily initialized by two-point calibration into continuous flow reactors. To demonstrate the applicability of the sensor under reaction conditions, an oxidation of a Grignard reagent with molecular oxygen was performed in a flow reactor. The sensors were able to show the oxygen decrease during reaction and allowed online reactant quantification.

Seiten (von - bis)2081-2087
FachzeitschriftReaction Chemistry and Engineering
PublikationsstatusVeröffentlicht - 2019

ASJC Scopus subject areas

  • !!Catalysis
  • !!Chemistry (miscellaneous)
  • !!Chemical Engineering (miscellaneous)
  • !!Process Chemistry and Technology
  • !!Fluid Flow and Transfer Processes

Fields of Expertise

  • Advanced Materials Science


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