Patent ID: 6924247

Claim:
A method for separating zeolite crystals from an aqueous medium, comprising: (a) preparing an aqueous alkaline mother liquor containing, as reagents for zeolite preparation, a silica source, optionally alumina and/or other metal oxide sources and/or an organic templating agent; (b) hydrothermally treating said mother liquor thereby obtaining a suspension containing: - zeolite crystals, reagents of the zeolite preparation not transformed into zeolitic crystalline phase during the hydrothermal treatment and optionally oxides generated by them, optionally organic templating agent and optionally product generated by the decomposition of said sources of silica and alumina; (c) treating the zeolite crystal containing suspension with an acid until the suspension attains a pH ranging from 3-8; and (d) filtering or decanting the resulting mixture to isolate the zeolite crystals in mixture with oxides generated by said reagents of the zeolite preparation not transformed into zeolitic crystalline phase.