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Développement de nouvelles voies de synthèse en micro-réacteurs plasmas gaz/liquide

Abstract : For a cleaner and cheaper industry, chemical specialists can: optimize processes, develop innovating synthetic route and/or processes. Thanks to the disruptive alliance between plasma synthesis and microfluidic, plasma-activated microreactor of team 2PM-IRCP are promising tools for a greener, catalyst- and solventless chemistry, realized at ambient pressure and temperature.After the recent investigations of plasma-activated amination and oxidation in the lab, we are herein exploring new reactivities within the same reactor – Biflow – with a reinforced methodology and process robustness. Two kinds of reactivities were tested: oligomerization of linear alkenes - 1-hexene and 1-dodecene – under various gas – Ar, He, O2, H2 – and the functionalization of several molecules under O2 plasma (followed by H2 plasma as opening).The synthesis of short oligomer chains – 10 units – was successful for both monomers. The volatility of the monomer and the localization of molecules in the gas/liquid phase were underlined as very influent on the chemistry. Plasma power, residence time, pressure and nature of the plasmageneous gas were reported as major levers for the control of reactivity.The dioxygen plasma generated a competition between functionalization, fragmentation and oligomerization for linear or cyclic alkanes, aromatics, amines or halogenated components. Volatility was once again a major parameter in the observed plasma chemistry. Temperature, ratio between liquid and gas flowrates, plasma power or the use of coupled UV-plasma processes were designated as powerful parameters or tool for a better control of reactivity.The evidence of new synthetic pathways, sometimes with very satisfying yields, conversion and selectivities, coupled with the versatility of the reactor and the opportunity of control through several parameters, offer altogether very promising industrial outlooks to this project.
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Submitted on : Wednesday, July 13, 2022 - 3:12:17 PM
Last modification on : Thursday, July 14, 2022 - 3:52:17 AM

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Pierre-Alexandre Royoux. Développement de nouvelles voies de synthèse en micro-réacteurs plasmas gaz/liquide. Génie des procédés. Université Paris sciences et lettres, 2021. Français. ⟨NNT : 2021UPSLC002⟩. ⟨tel-03722697⟩

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