Claims
- 1. In a process for preparing a zeolite ZSM-12 type crystalline material by preparing a reaction mixture containing a source of an alkali or alkaline earth metal oxide, an oxide of silicon, methyltriethylammonium ion and water, and maintaining said mixture under crystallization conditions until crystals of said zeolite are formed, the improvement which comprises:
- preparing the reaction mixture from a high purity silica source, said reaction mixture containing no added alumina, having a pre-crystallization pH of about 13, and having a composition, in terms of mole ratios of oxides, falling within the following ranges:
- ______________________________________SiO.sub.2 /Al.sub.2 O.sub.3 200 to .infin.M.sub.2 O/[MTEA).sub.2 O + M.sub.2 O] 0.0 to 0.8OH.sup.- /SiO.sub.2 0.1 to 1.2H.sub.2 O/[(MTEA).sub.2 O + M.sub.2 O] 50 to 250______________________________________
- wherein M is an alkali or alkaline earth metal and (MTEA).sup.+ is a methyltriethylammonium ion.
- 2. A method according to claim 1 wherein said mixture has a composition, in terms of mole ratios of oxides, falling within the following ranges:
- ______________________________________SiO.sub.2 /Al.sub.2 O.sub.3 400 to .infin.M.sub.2 O/[MTEA).sub.2 O + M.sub.2 O] 0.2 to 0.6OH.sup.- /SiO.sub.2 0.2 to 1.0H.sub.2 O/[(MTEA).sub.2 O + M.sub.2 O] 60 to 200______________________________________
CROSS REFERENCE TO RELATED APPLICATIONS
This application is a continuation-in-part of copending U.S. application Ser. No. 288,603, filed July 30, 1981, now abandoned.
This application is also a continuation-in-part of copending U.S. application Ser. No. 235,116, filed Feb. 17, 1981, now U.S. Pat. No. 4,452,769, which is, in turn, a continuation of U.S. application Ser. No. 140,466, filed Apr. 17, 1980, now abondoned, which is, in turn, a continuation of U.S. application Ser. No. 22,260, filed Mar. 21, 1979, now abandoned.
The entire disclosures of the above-identified applications are expressly incorporated herein by reference.
US Referenced Citations (7)
Foreign Referenced Citations (4)
Number |
Date |
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0002079 |
May 1979 |
EPX |
0018089 |
Oct 1980 |
EPX |
0093519 |
Sep 1983 |
EPX |
2213109 |
Sep 1972 |
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Continuations (2)
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140466 |
Apr 1980 |
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Parent |
22260 |
Mar 1979 |
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Continuation in Parts (1)
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288603 |
Jul 1981 |
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