Abstract
A “tube-in-shell” membrane flow reactor has been developed for aerobic oxidation reactions that permits continuous delivery of O2 to a liquid-phase reaction along the entire length of the flow path. The reactor uses inexpensive O2-permeable PTFE (“Teflon”) tubing that is compatible with elevated pressures and temperatures and avoids hazardous mixtures of organic vapor and oxygen. Several polymeric materials were tested, and PTFE exhibits a useful combination of low cost, chemical stability and gas diffusion properties. Reactor performance is demonstrated in the aerobic oxidation of several alcohols with homogeneous Cu/TEMPO and Cu/ABNO catalysts (TEMPO = 2,2,6,6-tetramethyl-1-piperidinyl-N-oxyl and ABNO = 9-azabicyclo[3.3.1]nonane N-oxyl). Kinetic studies demonstrate regimes where the overall rate is controlled by the kinetics of the reaction or the transport of oxygen through the tube wall. Near-quantitative product yields are achieved with residence times as low as 1 min. A parallel, multitube reactor e...
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