Preparation of Dynamic Membrane Layered by Mixture of ZrCl20 and NaOH on Ceramic Membrane

Abstract

For application of a ceramic membrane as a molecular sieve, various conditic; ris of preparation were examined to prepare a reproducible dynamic membrane layered by a mixture of zrei-o atid NaOH on the ceramic membrane. The ceramic membrane was coated by a mixture containing 0.05 mol drn-3 ZrC12O at various pH under 2 kg cm-2 and 1 m s-' of feed velocity at 30 °C. The suspended mixture used has a maximum viscosity at pH 3.5-4.0and the precipitation does not occur below pH 3.5. A maximum rejection (0.99) of achymotrypsin was obtained on the dynamic membrane prepared in -the region of pH 3.0.