Overcoming mass and photon transfer limitations in a scalable reactor: Oxidation in an aerosol photoreactor

Abstract

This is a PDF file of an article that has undergone enhancements after acceptance, such as the addition of a cover page and metadata, and formatting for readability, but it is not yet the definitive version of record. This version will undergo additional copyediting, typesetting and review before it is published in its final form, but we are providing this version to give early visibility of the article. Please note that, during the production process, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.

Technological Innovations in Photochemistry for Organic Synthesis: Flow Chemistry, High-Throughput Experimentation, Scale-up, and Photoelectrochemistry

“…This effectively prolonged the lifetime of the nebula and simultaneously assisted with collection in the product vessel. Recently, another photoreactor design was reported that also used nebulization to produce aerosols to efficiently harvest the irradiated light . The general concept of this reactor was very similar to the NebPhotOX, but a key difference in reactor operation was the light irradiation.…”

“…Recently, another photoreactor design was reported that also used nebulization to produce aerosols to efficiently harvest the irradiated light. 170 The general concept of this reactor was very similar to the NebPhotOX, but a key difference in reactor operation was the light irradiation. Whereas the NebPhotOX used external irradiation, this design consists of an immersion well-type jacketed glass vessel where a UV-A lamp was placed in the center and the aerosol was passed through the annular hole (the jacket).…”

Modelling approaches to predict light absorption in gas-liquid flow photosensitized oxidations

“…The ray tracing model was employed to predict the light absorption in single and two-phase flow at the gas fractions βG=0. 25 [RB]•10 5…”

“…gasliquid-solid) [8,[12][13][14]. The optimization of operating conditions was studied for various gas-liquid flow patterns such as annular [10,[15][16][17], Taylor [18][19][20], bubbly flow [21][22][23] and more recently, aerosols [24,25]. Based on these experimental studies, the parameters determining the yield and selectivity of the oxygenated/oxidized products are the reactor channel size, the sum of liquid and gas flow rates, gas to liquid volumetric ratios, gas-liquid flow pattern, light intensity, photosensitizer concentration and oxygen pressure.…”

Dynamically triggering photoreactions for high performance and efficiency

“…[31] To overcome this issue, oscillatory flow conditions or ultrasound might be used to provide both an intense mass transport together with long residence time. [32][33][34] Scale-up strategies include classical numbering-up of capillary flow reactors as well as dedicated tank reactors with larger volumes. Various reactor designs have been shown to be scalable and were applied on industrial scale.…”