Abstract
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.
Original language | English |
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Pages (from-to) | 2081-2087 |
Number of pages | 7 |
Journal | Reaction Chemistry and Engineering |
Volume | 4 |
Issue number | 12 |
DOIs | |
Publication status | Published - 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