Patent ID: 6284218
Filing Date: 2001-09-04
Classification: C01B,Y10S

Abstract:
A process for preparing a synthetic faujasite zeolite, comprising:a) forming a reaction mixture consisting essentially of water, a source of silica, a source of alumina, Na.sub.2 O, and nucleation centers,wherein the reaction mixture has molar ratios of constituents as follows:Na.sub.2 O/SiO.sub.2 0.4-0.9 SiO.sub.2 /Al.sub.2 O.sub.3 7-13 H.sub.2 O/Na.sub.2 O 30-45, andwherein the nucleation centers have molar ratios of constituents as follows:Na.sub.2 O/SiO.sub.2 0.5-2.0 SiO.sub.2 /Al.sub.2 O.sub.3 10-20 H.sub.2 O/Na.sub.2 O 10-40; andb) heating the reaction mixture to a temperature ranging from 90 to 110.degree. C. for a time period ranging from 23 to 29 hours to obtain the synthetic faujasite zeolite,wherein the synthetic faujasite zeolite has a crystallite size ranging from 1500 to 2000 .ANG., a particle size ranging from 4000 to 8000 .ANG., and a retention of surface of more than 70% of that of a parent zeolite, when exchanged with ammonia and subjected to hydrothermal treatment at 650.degree. C. for 3 hours and with 100% steam.