Photochemical serpentine chip

Reaction 35 [R 35] Photochemical Serpentine Chip Micro Reactor... 

In their pioneering work, Jensen et al. demonstrated that photochemical transformation can be carried out in a microfabricated reactor [37]. The photomicroreactor had a single serpentine-shaped microchannel (having a width of 500 pm and a depth of 250 or 500 pm, and etched on a silicon chip) covered by a transparent window (Pyrex or quartz) (Scheme 4.25). A miniature UV light source and an online UV analysis probe were integrated to the device. Jensen et al. studied the radical photopinacolization of benzophenone in isopropanol. Substantial conversion of benzophenone was observed for a 0.5 M benzophenone solution in this microflow system. Such a high concentration of benzophenone would present a challenge in macroscale reactors. This microreaction device provided an opportunity for fast process optimization by online analysis of the reaction mixture. 

Photochemical singleliquid inlet port splits into two liquid streams, which are merged with a third channel. The latter is connected to a second port for gas feed, in such way that the two liquid streams encompass the gas stream. This section is followed by a serpentine channel passage, whidi ends in a third outlet port. The channel material is made of glass... 

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See also in sourсe #XX -- [ ]

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