US4767886A
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Method for preparing lower olefins
Assignee: DIRECTOR-GENERAL OF AGENCY OF AGENCY OF INDUSTRIAL SCIENCE AND TECNOLOGY 3-1 KASUMIGASEKI 1-CHOME CHIYODA-KU TOKYO 100 JAPAN
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Filing: 1987-03-05
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Granted: 1988-08-30
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Expires: 2007-03-05
Abstract
Abstract Here is disclosed a method for preparing lower olefins by bringing methanol and/or dimethyl ether into contact with a catalyst in a gaseous phase. In this method, the contact between the methanol and/or dimethyl ether and the catalyst is carried out at a weight hourly space velocity of 0.1 to 20 hr-1 at a reaction temperature of 300 DEG to 650 DEG C. under a total pressure of 0.1 to 100 atm by the use of, as the catalyst, an alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst; the alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst being prepared as disclosed in the Specification by modifying an alkaline earth metal-containing aluminoborosilicate so that the alkaline earth metal in an amount of at least 0.25% by weight in terms of the metal may be mixed with or supported in the zeolite catalyst.
Inventors
- 👤 Kichinari Kawamura
- 👤 Yasuo Kono
- 👤 Hideo Okado
- 👤 Hiroyuki Hagiwara
- 👤 Haruo Takaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:47
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/86; C; C07; C07C; C07C1/00; C07C1/20; C07C2529/00; C07C2529/86; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
258 words
A method for preparing lower olefins which comprises bringing methanol and/or dimethyl ether into contact with an alkaline earth metal-containing zeolite in the gaseous phase, said method being characterized by performing the gaseous phase reaction in the presence of an alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst; said alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst being prepared by subjecting, to a hydrothermal treatment at a temperature of 80° to 250° C., a raw material which satisfies the composition conditions of an SiO 2 /Al 2 O 3 molar ratio=12 to 3,000, an SiO 2 /B 2 O 3 molar ratio=1 to 1,000, an OH - /SiO 2 molar ratio=0.02 to 10, an H 2 O/SiO 2 molar ratio=1 to 2,000, a tetrapropylammonium compound/SiO 2 molar ratio=0.01 to 3, and an alkaline earth metal/Al gram-atom ratio=0.03 to 300, in order to form an alkaline earth metal-containing aluminoborosilicate having a composition of aM.sup.1.sub.2 O.bM.sup.2 O.Al.sub.2 O.sub.3.B.sub.2 O.sub.3.cSiO.sub.2.nH.sub.2 O wherein M 1 is an alkali metal and/or a hydrogen atom, M 2 is an alkaline earth metal, a is a value of 0 to 2, b is a value of 0.1 to 100, c is a value of 12 to 3,000, and n is a value of 0 to 30; and modifying the thus formed alkaline earth metal-containing aluminoborosilicate with an alkaline earth metal compound in solid or solution form so that said alkaline earth metal in an amount of at least 0.25% by weight in terms of the metal may be mixed with or supported in said zeolite.
Claim 2
Independent Claim
258 words
A method for preparing lower olefins which comprises bringing methanol and/or dimethyl ether into contact with an alkaline earth metal-containing zeolite in the gaseous phase, said method being characterized by performing the gaseous phase reaction in the presence of an alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst; said alkaline earth metal-modified alkaline earth metal-containing zeolite catalyst being prepared by subjecting, to a hydrothermal treatment at a temperature of 80° to 250° C., a raw material which satisfies the composition conditions of an SiO 2 /Al 2 O 3 molar ratio=12 to 3,000, an SiO 2 /B 2 O 3 molar ratio=1 to 1,000, an OH - /SiO 2 molar ratio=0.02 to 10, an H 2 O/SiO 2 molar ratio=1 to 2,000, a tetrapropylammonium compound/SiO 2 molar ratio=0.01 to 3, and an alkaline earth metal/Al gram-atom ratio=0.03 to 300, in order to form an alkaline earth metal-containing aluminoborosilicate having a composition of aM.sup.1.sub.2 O.bM.sup.2 O.Al.sub.2 O.sub.3.B.sub.2 O.sub.3.cSiO.sub.2.nH.sub.2 O wherein M 1 is an alkali metal and/or a hydrogen atom, M 2 is an alkaline earth metal, a is a value of 0 to 2, b is a value of 0.1 to 100, c is a value of 12 to 3,000, and n is a value of 0 to 30; and modifying the thus formed alkaline earth metal-containing aluminoborosilicate with an alkaline earth metal compound in solid or solution form so that said alkaline earth metal in an amount of at least 0.25% by weight in terms of the metal may be mixed with or supported in said zeolite.
Claim 3
Dependent Claim
57 words
A method for preparing lower olefins according to claim 1 wherein said gaseous phase reaction of methanol and/or dimethyl ether contacting wityh said catalyst is carried out at a weight hourly space velocity of 0.1 to 20 hr -1 at a reaction temperature of 300° to 650° C. under a total pressure of 0.1 to 100 atm.
Claim 4
Dependent Claim
27 words
A method for preparing lower olefins according to claim 2 wherein said weight hourly space velocity is within the range of 1 to 10 hr -1 .
Claim 5
Dependent Claim
23 words
A method for preparing lower olefins according to claim 2 wherein said total pressure is within the range of 0.5 to 10 atm.
Claim 6
Dependent Claim
22 words
A method for preparing lower olefins according to claim 2 wherein said temperature is within the range of 450° to 600° C.
Claim 7
Dependent Claim
26 words
A method for preparing lower olefins according to claim 1 wherein said alkaline earth metal-modified alkaline earth metal-containing zeolite is an alkaline earth metal-modified calcium-containing zeolite.
Claim 8
Dependent Claim
26 words
A method for preparing lower olefins according to claim 1 wherein said alkaline earth metal-modified alkaline earth metal-containing zeolite is an alkaline earth metal-modified strontium-containing zeolite.
Claim 9
Dependent Claim
26 words
A method for preparing lower olefins according to claim 1 wherein said alkaline earth metal-modified alkaline earth metal-containing zeolite is an alkaline earth metal-modified barium-containing zeolite.
Claim 10
Dependent Claim
26 words
A method for preparing lower olefins according to claim 1 wherein said alkaline earth metal-modified alkaline earth metal-containing zeolite is an alkaline earth metal-modified magnesium-containing zeolite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-08-30 | 1992-02-29 | 1992-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-30 | 1996-02-29 | 1996-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-30 | 2000-02-29 | 2000-08-30 | $7700.00 | Window Closed / Lapsed |