Patent US4593136A successfully refreshed from Google Patents.
US4593136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZSM-5/ZSM-12 catalyst mixture for cracking alkylbenzenes
Assignee: Mobil Oil AS
•
Filing: 1985-10-07
•
Granted: 1986-06-03
•
Expires: 2005-10-07
Abstract
Abstract There is provided a mixed catalyst of ZSM-5 and ZSM-12. Alkylbenzenes, especially heavy aromatic bottoms from cumene production, may be cracked over this mixed catalyst.
Inventors
- 👤 Warren W. Kaeding
- 👤 Carol S. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:39
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/02; C07C4/06; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
82 words
In a method for the preparation of isopropylbenzene from benzene and a mixture of propane and propylene, wherein a heavy aromatic bottoms fraction is produced as a byproduct, said bottoms fraction consisting essentially of hydrocarbons having 10 or more carbon atoms, the improvement comprising cracking said bottoms fraction over a catalyst comprising a mixture of zeolites, said mixture comprising: (i) from about 10% to about 90% by weight of ZSM-5; and (ii) from about 10% to about 90% by weight of ZSM-12.
Claim 2
Dependent Claim
82 words
In a method for the preparation of isopropylbenzene from benzene and a mixture of propane and propylene, wherein a heavy aromatic bottoms fraction is produced as a byproduct, said bottoms fraction consisting essentially of hydrocarbons having 10 or more carbon atoms, the improvement comprising cracking said bottoms fraction over a catalyst comprising a mixture of zeolites, said mixture comprising: (i) from about 10% to about 90% by weight of ZSM-5; and (ii) from about 10% to about 90% by weight of ZSM-12.
Claim 3
Dependent Claim
18 words
A method according to claim 1, wherein said bottoms fraction comprises at least 50% by weight of diisopropylbenzene.
Claim 4
Dependent Claim
51 words
A method according to claim 2, wherein said bottoms fraction comprises less than 5% by weight of the sum of the weights of benzene, toluene, xylene and ethylbenzene and the cracked bottoms fraction comprises at least 30% by weight of the sum of the weights of benzene, toluene, xylene and ethylbenzene.
Claim 5
Dependent Claim
44 words
A method according to claim 3, wherein the cracking conditions comprise a WHSV of from about 0.5 to about 10, a cracking temperature of from about 300° to about 600° C. and a cracking pressure of less than or equal to about 500 psig.
References Cited (Backward Citations)
US4136128A
Cited
US4188282A
Cited
US4289606A
Cited
US4251676A
Cited
US4463209A
Cited
US4372839A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-02 | 1989-12-02 | 1990-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-02 | 1993-12-02 | 1994-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-02 | 1997-12-02 | 1998-06-03 | $7700.00 | Window Closed / Lapsed |