US4495303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making zeolite ZSM-45 with a dimethyldiethylammonium directing agent
Assignee: Mobil Oil AS
•
Filing: 1983-11-29
•
Granted: 1985-01-22
•
Expires: 2003-11-29
Abstract
Abstract This invention relates to a method for preparing a synthetic porous crystalline aluminosilicate zeolite, characterized as zeolite ZSM-45. This crystalline material may have a silica to alumina molar ratio of at least 8. This synthetic zeolite is analogous, in some respects, to the naturally occurring zeolite, levynite. The ZSM-45 zeolite is prepared with a dimethyldiethylammonium directing agent. ZSM-45 exhibits a characteristic X-ray diffraction pattern.
Inventors
- 👤 Guenter H. Kuehl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:36
CPC Classifications
C; C01; C01B; C01B39/00; C01B39/02; C01B39/46; C01B39/48; Y; Y10; Y10S; Y10S423/00; Y10S423/37
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A method for preparing a synthetic porous crystalline aluminosilicate zeolite, said aluminosilicate zeolite having a silica to alumina ratio of at least 8, said aluminosilicate zeolite as calcined further being characterized by an X-ray diffraction pattern exhibiting values substantially as set forth in Table 1 of the specification, said method comprising preparing a mixture capable of forming said aluminosilicate zeolite, said mixture containing sources of alkali metal ions, an oxide of aluminum, an oxide of silicon, a dimethyldiethylammonium ion and water and having a composition in terms of moles of oxides, falling within the following ranges: ______________________________________
SiO.sub.2 /Al.sub.2 O.sub.3
10-80
H.sub.2 O/OH.sup.- 15-100
OH.sup.- /SiO.sub.2
0.40-0.80
DMDEA/(DMDEA + Z) 0.75-1.0
______________________________________ wherein DMDEA represents said dimethyldiethylammonium ion and Z represents said alkali metal ion, and maintaining said mixture under sufficient conditions until said crystalline aluminosilicate zeolite is formed.
Claim 2
Independent Claim
139 words
A method for preparing a synthetic porous crystalline aluminosilicate zeolite, said aluminosilicate zeolite having a silica to alumina ratio of at least 8, said aluminosilicate zeolite as calcined further being characterized by an X-ray diffraction pattern exhibiting values substantially as set forth in Table 1 of the specification, said method comprising preparing a mixture capable of forming said aluminosilicate zeolite, said mixture containing sources of alkali metal ions, an oxide of aluminum, an oxide of silicon, a dimethyldiethylammonium ion and water and having a composition in terms of moles of oxides, falling within the following ranges: ______________________________________
SiO.sub.2 /Al.sub.2 O.sub.3
10-80
H.sub.2 O/OH.sup.- 15-100
OH.sup.- /SiO.sub.2
0.40-0.80
DMDEA/(DMDEA + Z) 0.75-1.0
______________________________________ wherein DMDEA represents said dimethyldiethylammonium ion and Z represents said alkali metal ion, and maintaining said mixture under sufficient conditions until said crystalline aluminosilicate zeolite is formed.
Claim 3
Dependent Claim
39 words
A method according to claim 1, wherein said mixture has a composition, in terms of moles of oxides, falling within the following ranges: ______________________________________
SiO.sub.2 /Al.sub.2 O.sub.3
20-60
H.sub.2 O/OH.sup.- 20-80
OH.sup.- /SiO.sub.2
0.50-0.70
DMDEA/(DMDEA + Z) 0.8-0.95.
______________________________________
Claim 4
Dependent Claim
15 words
A method according to claim 1, wherein said mixture is essentially free of potassium ions.
Claim 5
Dependent Claim
21 words
A method according to claim 1, wherein said mixture further comprises a sufficient amount of ZSM- 45 formation enhancing seed crystals.
Claim 6
Dependent Claim
74 words
A synthetic porous crystalline aluminosilicate zeolite having a composition, on an anhydrous basis and in terms of moles of oxides per mole of alumina, expressed by the formula: (0.8-1.8)R.sub.2 O:(0.0-0.3)Na.sub.2 O:(0.0-0.5)K.sub.2 O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein R 2 O is the oxide of dimethyldiethylammonium ions and x is at least 8, said aluminosilicate zeolite as calcined being characterized by an X-ray diffraction pattern exhibiting values substantially as set forth in Table 1 of the specification.
Claim 7
Dependent Claim
74 words
A synthetic porous crystalline aluminosilicate zeolite having a composition, on an anhydrous basis and in terms of moles of oxides per mole of alumina, expressed by the formula: (0.8-1.8)R.sub.2 O:(0.0-0.3)Na.sub.2 O:(0.0-0.5)K.sub.2 O:Al.sub.2 O.sub.3 :xSiO.sub.2 wherein R 2 O is the oxide of dimethyldiethylammonium ions and x is at least 8, said aluminosilicate zeolite as calcined being characterized by an X-ray diffraction pattern exhibiting values substantially as set forth in Table 1 of the specification.
Claim 8
Dependent Claim
13 words
An aluminosilicate zeolite according to claim 5, which is essentially free of potassium.
References Cited (Backward Citations)
US3709979A
Cited
US3832449A
Cited
US4452769A
Cited
EP0026963A1
Cited
US4372930A
Cited
EP0091048A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-22 | 1988-07-23 | 1989-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-22 | 1992-07-23 | 1993-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-22 | 1996-07-23 | 1997-01-22 | $7700.00 | Window Closed / Lapsed |