(529c) Engineering Porous Polymer Hollow Fiber Microfluidic Reactors for Sustainable C-H Functionalization | AIChE

(529c) Engineering Porous Polymer Hollow Fiber Microfluidic Reactors for Sustainable C-H Functionalization

Authors 

He, Y. - Presenter, Missouri University of Science and Technology
Rownaghi, A. A., Oklahoma State
The highly hydrophilic and solvent-stable porous polyamide-imide (PAI) hollow fibers were created by crosslinking of bare PAI hollow fibers with 3-aminopropyl trimethoxy silane (APS). The obtained composite hollow fibers were used as continuous-flow process for heterogeneously catalyzed the aldol and nitroaldol condensations of aromatic aldehydes with acetone and nitomethane at 50 and 40 °C, respectively. Furthermore, the APS-grafted PAI hollow fibers were also functionalized with salicylic aldehyde for binding catalytically active Pd(II) ions through covalent postmodification method. The catalytic activity of the composite hollow fiber microfluidic reactors (Pd(II) immobilized APS-grafted PAI hollow fibers) was tested via heterogeneous Heck coupling reaction of aryl halides under both batch and continuous flow reaction in polar aprotic solvents at high temperature (120 °C) and low operating pressure. XPS and ICP analyses of the startings and recycled composite hollow fibers indicated that the fibers contain very similar loading of Pd(II) implying no degree of catalyst leaching from hollow fibers during reaction. The composite hollow fiber microfluidic reactors showed long-term stability and strong control over the leaching of Pd species.