PROCESS FOR THE PRODUCTION OF POROUS AND PERMEABLE INORGANIC MEMBRANES

摘要

The invention relates to a process for the production of porous, permeable, mineral membranes. According to this process, on a porous, permeable substrate is formed a thin layer of at least one mineral compound chosen from among the simple or mixed metal oxides, except aluminum oxide and mixed aluminium oxides, simple or mixed metal hydroxides, except aluminium hydroxide and mixed aluminium hydroxides and mixtures thereof on the basis of a suspension in a liquid of colloidal or non-colloidal particles, said compound or a precursor thereof having particle sizes below 10 mu m. The suspension is kept in the finely divided state by the continuous application of energy to the reaction medium. The thus obtained membrane is dried and then annealed at a temperature between 400 DEG and 1100 DEG C. The use of a suspension of ultrafine colloidal or non-colloidal particles makes it possible to obviate the compression stage and obtain microporous layers with very small pore radii.