Zeolite (ECR-18) isostructural with paulingite and a method for its preparation

Claim 2

A synthetic zeolite containing tetraethylammonium ion which is isostructural to the mineral paulingite.

Claim 3

A synthetic zeolite having an overall chemical composition: (TEA,Na).sub.2 O:(Al,Ga).sub.2 O.sub.3 :3-20 SiO.sub.2 and substantially the x-ray diffraction pattern shown in Table 1.

Claim 4

A synthetic zeolite having an overall chemical composition: (TEA,Na).sub.2 O:(Al,Ga).sub.2 O.sub.3 :3-20 SiO.sub.2 and substantially the x-ray diffraction pattern shown in Table 1.

Claim 5

The synthetic zeolite of claim 2 wherein the overall chemical composition is: (TEA,Na).sub.2 O:Al.sub.2 O.sub.3 :4 to 10 SiO.sub.2.

Claim 6

The synthetic zeolite of claim 2 wherein the void volume of the zeolite is greater than 0.40 cc/cc of zeolite.

Claim 7

A process for preparing the zeolite of claim 2 which comprises: (a) preparing a reaction mixture comprising an oxide of sodium, water, a source of silica, a source of alumina, a tetraethylammonium ion source and, sodium aluminosilicate nucleating seeds, said reaction mixture having a composition, in terms of mole ratios of oxides, within the following ranges: ______________________________________ Na.sub.2 O:Al.sub.2 O.sub.3 0.4 to 3.4 (TEA).sub.2 O:Al.sub.2 O.sub.3 0.8 to 4.5 SiO.sub.2 :Al.sub.2 O.sub.3 4 to 22 H.sub.2 O:Al.sub.2 O.sub.3 80 to 360 ______________________________________ and said seeds being present in an amount to yield 0.1 to 10 mole percent of the total final alumina content in said zeolite; (b) blending the reaction mixture sufficiently to form a substantially homogeneous mixture; (c) maintaining the reaction mixture at between about 80° C. and 220° C. under autogenous pressure for a sufficient period of time to form crystals of said zeolite; and (d) recovering said zeolite crystals.

Claim 8

The process of claim 5 wherein the zeolite has a composition, in terms of mole ratios of oxides, in the range: (TEA,Na).sub.2 O:Al.sub.2 O.sub.3 :3 to 10 SiO.sub.2.

Claim 9

The process of claim 5 wherein the source of silica is sodium silicate and the sources of alumina are sodium aluminate and an aluminum salt selected from the group consisting of the chloride, sulfate and nitrate salts.

Claim 10

The process of claim 5 wherein the reaction mixture is maintained between 90° and 180° C.

Claim 11

The process of claim 5 wherein the seeds are present in an amount to yield 1 to 20 mole percent of the total final alumina content.