1998 Volume 23 Issue 5 Pages 259-265
In order to prepare a membrane with high ethanol permselectivity, the effects of preparation conditions such as the composition of starting solution, calcination temperature and period on pervaporation performance of silicalite membrane has been investigated in detail.
The silicalite membranes were prepared on porous supports of sintered stainless steel by hydrothermal synthesis at 170°C for 48 h-192h. Then silicalite membrane was calcined at over 250°C for 20h-60h in an ordinal oven. The pervaporation performance of the silicalite membranes was measured at 30-60°C for 5 vol% ethanol aqueous solution as a feed and was evaluated by separation factor α and fluxes.
The silicalite membrane prepared by hydrothermal synthesis at 170°C for 144h using a solution, where H2O/SiO2 ratio was 90, and calcined at 375°C for 60h. The silicalite membrane prepared showed a separation factor α (EtOH/H2O) =120 with a total flux of 0.29kg/m2·for a 5 vol% ethanol aqueous solution at 30°C.
