Articolo in rivista, 2022, ENG, 10.22079/JMSR.2021.529429.1465

Vacuum Membrane Dryers: from basic principles to applications

A. Criscuoli

Institute on Membrane Technology (CNR-ITM), via P. Bucci 17/C, 87036 Rende (CS) Italy

Vacuum Membrane Dryers (VMDrs) are new membrane operations designed for the recovery of dry compounds from aqueous feeds. In this work, VMDrs development and application were reviewed and discussed. Flat and capillary membrane modules with feed recirculation and in static configuration (feed in contact with one side of the membrane without recirculation) were compared. VMDRs in static configuration were applied to the treatment of aqueous suspensions of 10 wt.% polystyrene microparticles (size ranging from 0.3 ?m to 7 ?m) at 30°C and 4 mbar, and to the treatment of aqueous solutions of caffeine (concentration ranging from 0.1 wt.% to 0.3 wt.%) at 45°C and 4 mbar. In both cases, a 0.2 ?m polypropylene flat membrane was used. Dry solids (polystyrene) and crystals (caffeine) were obtained, together with distillates free of solids and crystals. For the two case studies, the drying efficiency and main differences were underlined. Finally, benefits of VMDrs and further research needed were presented.

Journal of membrane science and research 8

Keywords

Vacuum Membrane Dryers, Vacuum Membrane Distillation, Polystyrene microparticles, Caffeine, Dehydration

CNR authors

Criscuoli Alessandra

CNR institutes

ITM – Istituto per la tecnologia delle membrane