US4251676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Selective cracking reactions by cofeeding organic amine or ammonia
Assignee: Mobil Oil AS
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Filing: 1979-12-28
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Granted: 1981-02-17
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Expires: 1999-12-28
Abstract
Abstract An improved process for selective cracking of 1,4-disubstituted aromatic compounds whereby the yield of recyclable olefin cracking product is increased. The process is carried out in the presence of a specified type of crystalline zeolite cracking catalyst (e.g. ZSM-5) and the reactor feed is admixed with ammonia or an organic amine.
Inventors
- 👤 Margaret M. Wu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:40
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/02; C07C4/06; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
64 words
In the process for selective cracking of 1,4-disubstituted aromatic compounds in the presence of crystalline zeolite catalysts, said zeolites being characterized by a constraint index within the approximate range of 1 to 12 and a silica to alumina mole ratio of at least 12, the improvement comprising: contacting said disubstituted aromatic compounds with said zeolite in the presence of ammonia or an organic amine.
Claim 2
Dependent Claim
64 words
In the process for selective cracking of 1,4-disubstituted aromatic compounds in the presence of crystalline zeolite catalysts, said zeolites being characterized by a constraint index within the approximate range of 1 to 12 and a silica to alumina mole ratio of at least 12, the improvement comprising: contacting said disubstituted aromatic compounds with said zeolite in the presence of ammonia or an organic amine.
Claim 3
Dependent Claim
27 words
The improved process of claim 1 wherein said ammonia or organic amine is mixed with said disubstituted aromatic compounds prior to contacting said compounds with said zeolite.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein said ammonia or organic amine is present in an amount of between about 0.5 mole percent and about 30 mole percent of the disubstituted aromatic compound concentration.
Claim 5
Dependent Claim
31 words
The process of claim 3 wherein said ammonia or organic amine is present in an amount of between 1 mole percent and 10 mole percent of the disubstituted aromatic compound concentration.
Claim 6
Dependent Claim
66 words
The process of claim 1 wherein said disubstituted aromatic compounds comprise compounds defined by the formula: ##STR2## wherein R 1 and R 2 are alkyl, alkylene or alkyne groups having from one to eight carbon atoms and R 1 is the same as or different than R 2 and, further, wherein at least one of R 1 and R 2 contains more than one carbon atom.
Claim 7
Dependent Claim
38 words
The process of claim 1 wherein said contacting is carried out at a temperature of between about 200° C. and about 600° C. and a pressure of from 10 4 N/m 2 to 10 6 N/m 2 .
Claim 8
Dependent Claim
17 words
The process of claim 6 wherein said temperature is between about 300° C. and about 450° C.
Claim 9
Dependent Claim
20 words
The process of claim 7 wherein said pressure is between 5×10 4 N/m 2 and 2×10 5 N/m 2 .
Claim 10
Dependent Claim
23 words
The process of claim 1 wherein said crystalline zeolite is chosen from the group consisting of: ZSM-5; ZSM-11; ZSM-12; ZSM-23; ZSM-35 and ZSM-38.
Claim 11
Dependent Claim
11 words
The process of claim 1 wherein said crystalline zeolite is ZSM-5.
Claim 12
Dependent Claim
16 words
The process of claim 1, 9 or 10 wherein said zeolite additionally comprises a binder therefor.
References Cited (Backward Citations)
US4181811A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |