Preparation of ZSM-12 type zeolites
AssigneeMobil Oil Corporation
InventorsEdward J. Rosinski, Mae K. Rubin
Life of this patent
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Abstract
A new and useful improvement in the method for preparing synthetic crystalline aluminosilicate zeolite ZSM-12 is provided. The improved method comprises synthesizing ZSM-12 in the presence of cyclic quaternary amine halides as templates rather than the conventional template of tetraethylammonium.
Claims6
In a process for manufacturing synthetic zeolite ZSM-12 which process comprises crystallizing an aqueous forming solution comprising a source of silica and an nitrogenous template and recovering said zeolite ZSM-12, the improvement which comprises utilizing as said nitrogenous template a compound selected from the group consisting of dimethyl pyridinium and dimethyl pyrrolidinium halides.
A process for preparing zeolite ZSM-12 which comprises preparing a mixture containing sources of an alkali metal oxide and organic nitrogen containing oxide, an oxide of silicon with and without an oxide of aluminum and water and having a composition in terms of mole ratios of oxides falling within the following ranges:
- ______________________________________ OH.sup.- /SiO.sub.2 0.1-0.40 R/R+M+ 0.2-0.95 SiO.sub.2 /Al.sub.2 O.sub.3 40-.infin. H.sub.2 O/OH.sup.- 20-300 ______________________________________
- wherein R is dimethyl pyrrolidinium or dimethyl pyridinium halide and M is an alkali metal ion and maintaining the mixture at elevated temperatures until crystals of ZSM-12 are formed.
Dependencies are inferred from the claim text.