Photooxygenation in an advanced led-driven flow reactor module: experimental investigations and modelling

Radjagobalou, Robbie, Blanco, Jean-François, Dechy-Cabaret, Odile, Oelgemöller, Michael, and Loubière, Karine (2018) Photooxygenation in an advanced led-driven flow reactor module: experimental investigations and modelling. Chemical Engineering and Processing, 130. pp. 214-228.

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Abstract

The photooxygenation of α-terpinene was investigated as a benchmark reaction in an advanced LED-driven flow reactor module, both from an experimental and modelling point of view. Ethanol was used as a green solvent and rose Bengal was chosen as a cheap sensitizer of industrial importance. Firstly, the kinetic law based on all mechanistic steps was established for the chosen photooxygenation. From this, the set of operating parameters potentially influencing the photoreaction rate were identified. Subsequently, experiments were carried out under continuous-flow conditions to screen these operating parameters, namely concentration of α-terpinene, concentration of photosensitizer, residence time, structure of the segmented gas-liquid flow and nature of the reagent gas phase (air versus pure oxygen). Finally, the conditions enabling minimization of sensitizer bleaching were established. It was also shown that the hydrodynamic characteristics of the gas-liquid flow can have an effect on the conversion levels. From this, a simplified model was proposed to predict the conversion at the reactor’s outlet when pure oxygen was used.

Item ID: 54376
Item Type: Article (Research - C1)
ISSN: 1873-3204
Keywords: flow photochemistry; photooxygenation; kinetic law; LED-driven flow reactor; sensitizer bleaching; modelling
Funders: Australian Research Council (ARC), French Research Agency (ANR)
Projects and Grants: ARC DP130100794, ANR-15-CE07-0008-01
Date Deposited: 04 Jul 2018 03:49
FoR Codes: 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030503 Organic Chemical Synthesis @ 40%
03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030505 Physical Organic Chemistry @ 60%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970103 Expanding Knowledge in the Chemical Sciences @ 100%
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