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Continuous photo-oxidation in a vortex reactor: efficient operations using air drawn from the laboratory

Lee, Darren S.; Amara, Zacharias; Clark, Charlotte A.; Xu, Zeyuan; Kakimpa, Bruce; Morvan, Herve; Pickering, S.J.; Poliakoff, Martyn; George, Michael W.

Authors

Darren S. Lee

Zacharias Amara AMARA Zacharias

Charlotte A. Clark

Zeyuan Xu

Bruce Kakimpa

Herve Morvan Herve.Morvan@nottingham.ac.uk

S.J. Pickering

Martyn Poliakoff

Michael W. George



Abstract

We report the construction and use of a vortex reactor which uses a rapidly rotating cylinder to generate Taylor vortices for continuous flow thermal and photochemical reactions. The reactor is designed to operate under conditions required for vortex generation. The flow pattern of the vortices has been represented using computational fluid dynamics, and the presence of the vortices can be easily visualized by observing streams of bubbles within the reactor. This approach presents certain advantages for reactions with added gases. For reactions with oxygen, the reactor offers an alternative to traditional setups as it efficiently draws in air from the lab without the need specifically to pressurize with oxygen. The rapid mixing generated by the vortices enables rapid mass transfer between the gas and the liquid phases allowing for a high efficiency dissolution of gases. The reactor has been applied to several photochemical reactions involving singlet oxygen (1O2) including the photo-oxidations of α-terpinene and furfuryl alcohol and the photodeborylation of phenyl boronic acid. The rotation speed of the cylinder proved to be key for reaction efficiency, and in the operation we found that the uptake of air was highest at 4000 rpm. The reactor has also been successfully applied to the synthesis of artemisinin, a potent antimalarial compound; and this three-step synthesis involving a Schenk-ene reaction with 1O2, Hock cleavage with H+, and an oxidative cyclization cascade with triplet oxygen (3O2), from dihydroartemisinic acid was carried out as a single process in the vortex reactor.

Journal Article Type Article
Publication Date Jul 3, 2017
Journal Organic Process Research and Development
Print ISSN 1083-6160
Electronic ISSN 1520-586X
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 21
Issue 7
APA6 Citation Lee, D. S., Amara, Z., Clark, C. A., Xu, Z., Kakimpa, B., Morvan, H., …George, M. W. (2017). Continuous photo-oxidation in a vortex reactor: efficient operations using air drawn from the laboratory. Organic Process Research and Development, 21(7), https://doi.org/10.1021/acs.oprd.7b00153
DOI https://doi.org/10.1021/acs.oprd.7b00153
Publisher URL http://pubs.acs.org/doi/abs/10.1021/acs.oprd.7b00153
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by/4.0





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