Production of zeolite Y

Claim 1

A method of producing crystalline synthetic faujasite, comprising the steps of separately preparing a sodium silicate solution and a sodium aluminate solution, providing an activated sodium silicate system by mixing said sodium silicate solution at ambient temperature with finely ground dry seed synthetic faujasite of the zeolite Y type product desired in an amount of about four percent of the final product and then cooking at about 100° C. for about four hours or more, cooling the activated sodium silicate system to about ambient temperature, mixing the sodium aluminate solution with the activated sodium silicate system at ambient temperature to provide a reaction mixture having a molar ratio of (5.0-8.5)Na 2 O.Al 2 O 3 .(15.0-25.0)SiO 2 . (100-180)H 2 O, heating the reaction mixture to about 100° C. for about twelve hours or more with agitation until the desired crystalline synthetic faujasite is formed, and recovering said faujasite.

Claim 2

A method of producing crystalline synthetic faujasite, comprising the steps of separately preparing a sodium silicate solution and a sodium aluminate solution, providing an activated sodium silicate system by mixing said sodium silicate solution at ambient temperature with finely ground dry seed synthetic faujasite of the zeolite Y type product desired in an amount of about four percent of the final product and then cooking at about 100° C. for about four hours or more, cooling the activated sodium silicate system to about ambient temperature, mixing the sodium aluminate solution with the activated sodium silicate system at ambient temperature to provide a reaction mixture having a molar ratio of (5.0-8.5)Na 2 O.Al 2 O 3 .(15.0-25.0)SiO 2 . (100-180)H 2 O, heating the reaction mixture to about 100° C. for about twelve hours or more with agitation until the desired crystalline synthetic faujasite is formed, and recovering said faujasite.

Claim 6

A method of preparing a crystalline zeolite Y, comprising the steps of (a) mixing at ambient temperature a sodium silicate solution with finely ground dry seed of zeolite Y in an amount of at least about four percent by weight of the expected product; (b) cooking the mixture at 100° C. for about four hours to provide an activated sodium silicate system; (c) cooling the activated sodium silicate system to ambient temperature; (d) adding a sodium aluminate solution to the activated sodium silicate system with stirring to produce a reaction mixture having a sodium oxide to alumina molar ratio about 5.0 to 8.5, a silica to alumina molar ratio of about 15.0-25.0, and a water to alumina molar ratio of about 100-180; (e) cooking the mixture 100° C. for about 12 to about 24 hours; (f) filtering, washing, drying and recovering the crystalline zeolite Y.

Claim 7

A method of preparing a crystalline zeolite Y, comprising the steps of (a) mixing at ambient temperature a sodium silicate solution with finely ground dry seed of zeolite Y in an amount of at least about four percent by weight of the expected product; (b) cooking the mixture at 100° C. for about four hours to provide an activated sodium silicate system; (c) cooling the activated sodium silicate system to ambient temperature; (d) adding a sodium aluminate solution to the activated sodium silicate system with stirring to produce a reaction mixture having a sodium oxide to alumina molar ratio about 5.0 to 8.5, a silica to alumina molar ratio of about 15.0-25.0, and a water to alumina molar ratio of about 100-180; (e) cooking the mixture 100° C. for about 12 to about 24 hours; (f) filtering, washing, drying and recovering the crystalline zeolite Y.