METHOD FOR PREPARING HIGH-SILICEOUS ZEOLITE Russian patent published in 1995 - IPC

FIELD: preparing zeolite. SUBSTANCE: water suspension of powdery silica gel is prepared in a calculated amount in a stirred vessel. A calculated amount of sodium aluminate and sodium hydroxide water solution is added to the suspension followed by admixing an organic structure-forming agent. The obtained suspension is stirred at a room temperature for 1.5 hour and next either filtered or centrifuged to the 45-75% residual moisture content. The concentrated residue is transferred to a stainless steel autoclave-crystallizer and crystallized at 130-150 C. The crystallization product is washed off by distilled water to acid number of approximately 9, dried and calcined at 550 C for 6 hours. EFFECT: reduced cycle of crystallizing zeolite. 1 tbl