Process for preparing crystalline aluminosilicate zeolites using a carboxylic acid
AssigneeToray Industries, Inc.
InventorsKazuyoshi Iwayama, Takao Kamano, Kuniyuki Tada, Takehisa Inoue
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Abstract
A crystalline aluminosilicate zeolite is obtained by stirring under heating an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and an organic carboxylic acid not containing an aromatic ring preferably having 3 to 6 carbon atoms and 1 to 3 carboxyl groups.
Claims7
A process for preparing a crystalline aluminosilicate zeolite, which process comprises reacting an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and a single type of organic template, said single type of organic template consisting essentially of an organic compound having 3 to 6 carbon atoms and 1 to 3 carboxyl groups and not containing an aromatic ring, and the composition, in terms of mole ratios, of said reaction mixture being as follows:
- ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 above 20 H.sub.2 O/SiO.sub.2 5 to 100 OH--/SiO.sub.2 0.05 to 0.40 A/Al.sub.2 O.sub.3 0.10 to 200 ______________________________________
- wherein A represents said organic compound, said process being conducted at a crystallization temperature of 140.degree.-180.degree. C. to form a crystalline aluminosilicate zeolite having the following X-ray diffraction pattern:
- ______________________________________ d(.ANG.) 100 I/Io ______________________________________ 11.2 .+-. 0.2 S 10.1 .+-. 0.2 S 9.8 .+-. 0.2 M 6.37 .+-. 0.1 W 6.00 .+-. 0.1 W 5.71 .+-. 0.1 W 5.58 .+-. 0.1 W 4.37 .+-. 0.08 W 4.27 .+-. 0.08 W 3.86 .+-. 0.08 VS 3.82 .+-. 0.02 VS 3.75 .+-. 0.08 S 3.72 .+-. 0.08 S 3.66 .+-. 0.05 M 3.00 .+-. 0.05 M 2.00 .+-. 0.05 W ______________________________________
- wherein VS=very strong, S=strong, M=medium strength and W=weak.
A process for preparing a crystalline aluminosilicate zeolite, which process comprises reacting an aqueous reaction mixture containing a silica source, an alumina source, an alkali source and a single type of organic template, said single type of organic template consisting essentially of an organic compound having 3 to 6 carbon atoms and 1 to 3 carboxyl groups and not containing an aromatic ring, and the composition, in terms of mole ratios, of said reaction mixture being as follows:
- ______________________________________ SiO.sub.2 /Al.sub.2 O.sub.3 15 to 75 H.sub.2 O/SiO.sub.2 10 to 50 OH--/SiO.sub.2 0.14 to 0.40 A/Al.sub.2 O.sub.3 0.10 to 50 ______________________________________
- wherein A represents said organic compound, said process being conducted at a crystallization temperature of 140.degree.-180.degree. C. to form a crystalline aluminosilicate zeolite having the following X-ray diffraction pattern:
- ______________________________________ d(.ANG.) 100 I/Io ______________________________________ 13.6 .+-. 0.2 M 10.2 .+-. 0.2 W 9.0 .+-. 0.2 S 6.56 .+-. 0.1 S 6.40 .+-. 0.1 M 6.05 .+-. 0.1 W 5.80 .+-. 0.1 M 4.52 .+-. 0.08 M 3.99 .+-. 0.08 S 3.83 .+-. 0.08 W 3.76 .+-. 0.08 W 3.53 .+-. 0.05 W 3.46 .+-. 0.05 VS 3.38 .+-. 0.05 S 3.28 .+-. 0.05 W 3.20 .+-. 0.05 S 3.15 .+-. 0.05 W 2.89 .+-. 0.05 M 2.51 .+-. 0.05 W ______________________________________
- wherein VS=very strong, S=strong, M=medium strength and W=weak.
Dependencies are inferred from the claim text.