W. R. Grace Co.

Michael G Barrett

David E Vaughan

Grant C Edwards

Synthetic crystalline alumino-silicate zeolites are prepared by combining reactant quantities of alumina, silica, sodium hydroxide and water with zeolite-forming alumino-silicate seeds having the composition 16 Na.sub.2 O: 2 to 9 Al.sub.2 O.sub.3 : 15 SiO.sub.2 : 500 to 2000 H.sub.2 O. The seed compositions may be used to produce Type A, X and Y crystalline alumino-silicate zeolites.

Preparation of zeolites

A high silica faujasite structure, CSZ-3, has a composition 0.02 to 0.20 Cs.sub.2 O: 0.80 to 0.95 Na.sub.2 O: Al.sub.2 O.sub.3 : 5.0 to 7.0 SiO.sub.2 : 2-10 H.sub.2 O The zeolite has utility in sorption, separation and catalytic applications and it has high hydrothermal stability. It is made by reacting sources of silica, alumina, soda, and cesia together with a nucleating agent in the form of seeds or a seed solution, followed by hot aging at a temperature between 50.degree. and 160.degree. C.

High silica faujasite polymorph - CSZ-3 and method of synthesizing

A new zeolite structure, CSZ-1, has a composition 0.05 to 0.55 M.sub.2 O:0.45 to 0.95 Na.sub.2 O:Al.sub.2 O.sub.3 : 3 to 7 SiO.sub.2 :x H.sub.2 O where M is cesium and/or thallium and x is 0 to 10. The zeolite has utility in sorption, separation and catalytic applications. It is made by reacting together sources of silica, alumina, soda, cesia and/or thallia, together with a nucleating agent or solution, followed by hot aging at a temperature between 50.degree. and 160.degree. C.

Synthesis of cesium-containing zeolite, CSZ-1

Type Y zeolite is prepared using a minimum excess of reactants by a method wherein required sodium hydroxide, silica, alumina and water reactants are combined in multi-stage procedure to obtain a uniform fluid reaction slurry. The procedure permits the efficient commercial production of high quality type Y zeolite and minimizes the formation of excess silicate containing by-product effluent.

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Laurel, MD, United States of America

Michael G Barrett