US4359595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective production of olefins
Assignee: Mobil Oil AS
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Filing: 1981-02-02
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Granted: 1982-11-16
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Expires: 2001-02-02
Abstract
Abstract A lower alcohol and/or ether feed is selectively converted to a mixture of light olefins, including ethylene and propylene, by catalytic contact of the feed material with a catalyst comprising one or more zeolites characterized by a silica to alumina mole ratio of at least 12 and a constraint index in the approximate range of 1 to 12. The catalytic conversion is carried out in the presence of bulky heterocyclic organic nitrogen compounds to suppress the formation of mononuclear aromatics. The process of this invention is particularly useful in the production of C2-C3 olefins from methanol or dimethyl ether.
Inventors
- 👤 Louis D. Rollmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:45
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/0234; B01J31/0235; B01J31/0254; B01J29/00; B01J29/04; B01J29/06; B01J29/40; C; C07; C07C; C07C1/00; C07C1/20; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C5/00; C07C5/22; C07C5/27; C07C5/2702; C07C5/2708; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B01J2229/00; B01J2229/10; B01J2229/12; B01J2229/123; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/38; B01J2229/42; B01J29/65; B01J29/70; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70; Y; Y02; Y02P; Y02P30/00; Y02P30/20; Y02P30/40
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
80 words
In a process for converting lower alcohols and/or ethers to lower olefins under conversion conditions in the presence of a catalyst comprising one or more zeolites having a silica to alumina mole ratio of at least 12 and a constrain index of 1 to 12, the improvement comprising contacting said catalyst with one or more bulky heterocyclic organic nitrogen compounds having an effective critical dimension of greater than 6.2 Angstroms and having a pKa of between about 3 and 9.
Claim 2
Dependent Claim
80 words
In a process for converting lower alcohols and/or ethers to lower olefins under conversion conditions in the presence of a catalyst comprising one or more zeolites having a silica to alumina mole ratio of at least 12 and a constrain index of 1 to 12, the improvement comprising contacting said catalyst with one or more bulky heterocyclic organic nitrogen compounds having an effective critical dimension of greater than 6.2 Angstroms and having a pKa of between about 3 and 9.
Claim 3
Dependent Claim
23 words
The process of claim 1 wherein said zeolite is selected from the group consisting of ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 4
Dependent Claim
10 words
The process of claim 2 wherein said zeolite is ZSM-5.
Claim 5
Dependent Claim
29 words
The process of claim 1 wherein the amount of nitrogen as nitrogen compound is present in amounts corresponding to between about 5 ppm and 15% based on total feed.
Claim 6
Dependent Claim
25 words
The process of claim 4 wherein said amount of nitrogen as nitrogen compound is between about 10 ppm and 5000 ppm based on total feed.
Claim 7
Dependent Claim
15 words
The process of claim 1 wherein said nitrogen compound is continuously contacted with said catalyst.
Claim 8
Dependent Claim
15 words
The process of claim 1 wherein said nitrogen compound is intermittently contacted with said catalyst.
Claim 9
Dependent Claim
16 words
The process of claim 1 wherein said nitrogen compound serves as a solvent for the reaction.
Claim 10
Dependent Claim
18 words
The process of claim 1 wherein said nitrogen compound serves as a heat transfer medium for the reaction.
Claim 11
Dependent Claim
20 words
The process of claim 8 or 9 wherein said nitrogen compound represents between about 10% and 90% of the feed.
Claim 12
Dependent Claim
18 words
The process of claim 1 wherein said nitrogen compound is added to said reaction as an initial slug.
Claim 13
Dependent Claim
25 words
The process of claim 1 wherein said nitrogen compound is selected from the group consisting of aryl substituted heterocyclic compounds and alkyl substituted heterocyclic compounds.
Claim 14
Dependent Claim
16 words
The process of claim 12 wherein said aryl substituted heterocyclic compounds are phenyl substituted heterocyclic compounds.
Claim 15
Dependent Claim
16 words
The process of claim 12 wherein said alkyl substituted heterocyclic compounds are methyl substituted heterocyclic compounds.
Claim 16
Dependent Claim
29 words
The process of claim 1 wherein said nitrogen compound is selected from the group consisting of alkylated pyridine derivatives, quinoline, alkylated quinolines, three-ring heterocycles and derivatives of three-ring heterocycles.
Claim 17
Dependent Claim
21 words
The process of claim 15 wherein said alkylated pyridine derivatives are selected from the group consisting of collidine, 3,4-lutidine and pentamethylpyridine.
Claim 18
Dependent Claim
21 words
The process of claim 15 wherein said alkylated quinolines are selected from the group consisting of 4-methylquinoline, 2,4-dimethylquinoline, 4,8-dimethylquinoline, and 2,4,8-trimethylquinoline.
Claim 19
Dependent Claim
19 words
The process of claim 15 wherein said three-ring heterocycles are selected from the group consisting of benzoquinolines and phenanthrolines.
Claim 20
Dependent Claim
21 words
The process of claim 15 wherein said derivatives of three-ring heterocycles are selected from the group consisting of neocuproine and bathophenanthroline.
Claim 21
Dependent Claim
14 words
The process of claim 1 wherein said effective critical dimension is greater than 6.8.
Claim 22
Dependent Claim
15 words
The process of claim 1 wherein said effective critical dimension is greater than 7.0 Angstroms.
References Cited (Backward Citations)
US4300011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-15 | 1986-05-17 | 1986-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-15 | 1990-05-17 | 1990-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-15 | 1994-05-17 | 1994-11-16 | $7700.00 | Window Closed / Lapsed |