Abstract
A microstructured falling film reactor was applied to the dye-sensitized photochemical conversion of 1,5-dihydroxynaphthalene to juglone for reactor and process evaluation.
Highlights
The FFMR is composed of a back plate carrying the heat exchanging unit and the inlet and outlet for the reaction solution
With the results of this work we present a detailed investigation of the utilization of a microstructured falling film reactor for a photochemical application with visible light
The excellent capability of the FFMR to contact gas and liquid phases is combined with high-power light emitting diodes (LEDs) arrays for the photonic contacting of the liquid phase that contains the metal-free sensitizers
Summary
Catalysed reactions have become of fundamental interest in the recent years.[1,2,3,4,5] Especially with the advent of photocatalytically active compounds and materials, which are able to absorb light in the visible region of the electromagnetic spectrum, many new synthetic methods have been developed for the preparation of valuable fine chemicals under mild reaction conditions.[6,7,8,9,10,11,12,13,14,15] A broad variety of transformations can be performed with organometallic compounds like Ru- or Ir-based polypyridyl complexes.[16,17] In conjunction with organocatalysts as chiral inductors stereoselective synthesis has been made possible as well.[18,19,20,21,22] More recently the application of precious metal-free catalysts has amplified the development of cost-efficient synthetic protocols for photochemical reactions.[23,24,25,26] it has been generally accepted that light, i.e. photons with defined wavelength, is a highly potent, selective and, in terms of Green Chemistry, a traceless reagent for synthetic organic chemistry.[27,28]. This continuous-flow microreactor enables the efficient contacting of a gas and a liquid phase in combination with external irradiation by high-power LED arrays offering various wavelengths. The photochemical process was investigated according LED wavelength, LED power, oxygen partial pressure, reactor architecture, substrate concentration and flow rate, and optimized to a conversion of X = 97% with 99% selectivity.
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