Vacuum Membrane Dryers: From Basic Principles to Applications


Institute on Membrane Technology (CNR-ITM), 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 micron to 7 micron) 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 micron 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.

Graphical Abstract

Vacuum Membrane Dryers: From Basic Principles to Applications


Main Subjects

Volume 8, Issue 2
Special Issue: Women in Membrane Science and Research
April 2022
  • Receive Date: 30 April 2021
  • Revise Date: 10 June 2021
  • Accept Date: 30 June 2021