MEMBRANE FILTRANTE MINERALE A PERMEABILITE AMELIOREE, ET SA PREPARATION.

摘要

A ceramic composite mineral filtering membrane including a thin microporous layer adhering to one side of a porous support having greater pore diameters than said thin layer, and having a specific permeability at least 25 % greater than that of an equivalent composite membrane obtained with the same support by the direct deposition, on said side thereof, of the same precursor material of said thin microporous layer, followed by conventional heat treatment; and the preparation thereof, wherein the support is impregnated with a solution of a film-forming organic polymer prior to applying the precursor material (slip) of said thin microporous layer. During subsequent heat treatment, the organic polymer is decomposed and the resulting thin microporous layer has high permeability while being firmly attached to the support.