US4259306A
Expired / Lapsed
US
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Synthesis of ZSM-39
Assignee: ExxonMobil Oil Corp
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Filing: 1980-06-06
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Granted: 1981-03-31
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Expires: 2000-06-06
Abstract
Abstract A new and useful method for preparing synthetic zeolite ZSM-39 is provided. This new method comprises synthesizing zeolite ZSM-39 in the presence of pyrrolidine as a template rather than the template of a tetraethylammonium cation or n-propylamine.
Inventors
- 👤 Bruce P. Pelrine
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:29
CPC Classifications
C; C01; C01B; C01B37/00; C01B37/02; C01B39/00; C01B39/02; C01B39/46; C01B39/48
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
175 words
A method for synthesizing crystalline zeolite ZSM-39 which has the composition expressed in terms of mole ratios of oxides in the anhydrous state as follows: (0-2.5)M 2 /nO: (0-2.5)Al 2 O 3 : 100 SiO 2 wherein M is at least one cation having a valence n, said zeolite being characterized by the X-ray diffraction pattern as set out in Table I herein, which comprises the steps of a. preparing a reaction mixture comprising sources of alkali metal oxide, an oxide of silicon, water, pyrrolidine, and a tetraureacobalt (II) complex and having a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =5-infinity H 2 O/SiO 2 =1-3000 OH-/SiO 2 =0.001-10 M/SiO 2 =0.01-3 R/SiO 2 =0.01-5 R'/SiO 2 =0.005-2 wherein M is an alkali or alkaline earth metal cation, R is pyrrolidine and R' is a tetraureacobalt (II) cation, and b. maintaining said mixture at a temperature of from between about 25° C. and about 250° C. until crystals of said zeolite are formed.
Claim 2
Independent Claim
175 words
A method for synthesizing crystalline zeolite ZSM-39 which has the composition expressed in terms of mole ratios of oxides in the anhydrous state as follows: (0-2.5)M 2 /nO: (0-2.5)Al 2 O 3 : 100 SiO 2 wherein M is at least one cation having a valence n, said zeolite being characterized by the X-ray diffraction pattern as set out in Table I herein, which comprises the steps of a. preparing a reaction mixture comprising sources of alkali metal oxide, an oxide of silicon, water, pyrrolidine, and a tetraureacobalt (II) complex and having a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =5-infinity H 2 O/SiO 2 =1-3000 OH-/SiO 2 =0.001-10 M/SiO 2 =0.01-3 R/SiO 2 =0.01-5 R'/SiO 2 =0.005-2 wherein M is an alkali or alkaline earth metal cation, R is pyrrolidine and R' is a tetraureacobalt (II) cation, and b. maintaining said mixture at a temperature of from between about 25° C. and about 250° C. until crystals of said zeolite are formed.
Claim 3
Dependent Claim
47 words
The method of claim 1 wherein the mixture has a composition, in terms of mole ratios of oxides, falling within the following ranges: SiO 2 /Al 2 O 3 =40-2000 H 2 O/SiO 2 =10-500 OH-/SiO 2 =0.005-5 M/SiO 2 =0.01-1 R/SiO 2 =0.01-3 R'/SiO 2 =0.01-1
Claim 4
Dependent Claim
19 words
The method of claim 1 wherein said temperature is maintained from between about 100° C. and about 175° C.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said tetraureacobalt (II) complex is tetraureacobalt (II) nitrate.
Claim 6
Dependent Claim
14 words
The method of claim 1 wherein said alkali metal ion is a sodium ion.
Claim 7
Dependent Claim
27 words
The method of claim 1 which comprises the further step of calcining said zeolite at a temperature of from between about 480° C. and about 650° C.
Claim 8
Dependent Claim
67 words
The method of claim 1 which comprises the further step of replacing, at least in part, the original cations of said zeolite by ion exchange with a cation or a mixture of cations selected from the group consisting of hydrogen and hydrogen precursors, rare earth metals, and metals from Groups IIA, IIIA, IVA, IB, IIB, IIIB, IVB, VIA and VIII of the Periodic Chart of the Elements.
Claim 9
Dependent Claim
16 words
The method of claim 1 wherein the reaction mixture further comprises a source of aluminum oxide.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein the reaction mixture is prepared in the absence of added aluminum oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |