US Patent 7476635 Process for making supported thin zeolite membrane

Described is a process for the preparation of a supported zeolite membrane that consists of a zeolite/substrate composite layer, whose zeolite phase exhibits a crystallinity of at least 85%, comprising:a) the formation of a gel or a solution that comprises at least one source of silica and water, supplemented with at least one polar organic compound,b) bringing into contact said gel or said solution with a porous substrate,c) the crystallization of the zeolite starting from said gel or said solution; andd) the elimination of residual agents.