VERFAHREN ZUR HERSTELLUNG VON ZEOLITH Y

• Main Author: WEBER, WILLIS WILMER, SOUTH SALEM, N.Y. (V.ST.A.)
• Format: Patent
• Language: German
• Published: 19.12.1974
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOUNDS THEREOF; INORGANIC CHEMISTRY; METALLURGY; NON-METALLIC ELEMENTS; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; SEPARATION; THEIR RELEVANT APPARATUS; TRANSPORTING

1437869 Zeolite Y UNION CARBIDE CORP 7 May 1974 [8 May 1973] 19983/74 Heading C1A Zeolite Y is prepared by (a) providing in a sealable reaction vessel a homogeneous aqueous aluminosilicate reaction mixture in which the source of silica is solid reactive amorphous silica, the reaction mixture having the following composition Na 2 O/SiO 2 0À30-0À36, SiO 2 /Al 2 O 3 8À0-11, H 2 O/Na 2 O 16-35 (oxide-mole ratios), (b) maintaining the reaction mixture at 95- 160‹ F. for 6-15 hours (optionally with agitation), (c) injecting steam into the reaction mixture to raise the temperature to 240-300‹ F. while not increasing the water content by not more than 15% by weight, (d) maintaining the reaction mixture under autogenous pressure for 4-20 hours at 240-300‹ F. and (e) rapidly decreasing the pressure from autogenous to atmospheric to obtain a temperature decrease of at least 35‹ F. in a period not exceeding 10 minutes. The process may include an additional step of filtering and washing the reaction mass solid to recover Zoelite Y crystals.