US4361713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Para-selective zeolite catalysts treated with halogen compounds
Assignee: Mobil Oil AS
•
Filing: 1981-06-26
•
Granted: 1982-11-30
•
Expires: 2001-06-26
Abstract
Abstract A process is provided for modifying ZSM-5 type zeolite catalysts with halogen-based treating agents in order to enhance the para-selective properties of such catalysts for the conversion of aromatic materials to dialkyl-substituted benzene compounds. Halogen-based treating agents include HCl, HBr, Cl 2 , Br 2 , CCl 4 , GeCl 4 and mixtures thereof. Catalyst compositions so treated can be used in alkylation, transalkylation or disproportionation processes to provide product mixtures having exceptionally high concentrations of the para-dialkylbenzene isomer.
Inventors
- 👤 Warren W. Kaeding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:17
CPC Classifications
C; C07; C07C; C07C6/00; C07C6/08; C07C6/12; C07C6/123; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J37/00; B01J37/22; C07C2/00; C07C2/54; C07C2/64; C07C2/66; C07C2/86; C07C2/861; C07C2/862; C07C2/864; C07C6/126; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/37; B01J2229/42; B01J29/65; B01J29/70; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/40; C07C2529/65; C07C2529/70
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
89 words
A process for converting aromatic compounds to a dialkyl benzene compound mixture highly enriched in the para-dialkylbenzene isomer, said process comprising contacting said aromatic compounds under conversion conditions with a zeolite based catalyst comprising a crystalline zeolite material characterized by a silica to alumina ratio of at least 12 and a constraint index of from about 1 to 12, said catalyst having been contacted with a gaseous medium containing a halogen-based treating agent selected from HCl, HBr, Cl 2 , Br 2 and mixtures thereof under para-selectivity enhancing conditions.
Claim 2
Dependent Claim
89 words
A process for converting aromatic compounds to a dialkyl benzene compound mixture highly enriched in the para-dialkylbenzene isomer, said process comprising contacting said aromatic compounds under conversion conditions with a zeolite based catalyst comprising a crystalline zeolite material characterized by a silica to alumina ratio of at least 12 and a constraint index of from about 1 to 12, said catalyst having been contacted with a gaseous medium containing a halogen-based treating agent selected from HCl, HBr, Cl 2 , Br 2 and mixtures thereof under para-selectivity enhancing conditions.
Claim 3
Dependent Claim
58 words
A process according to claim 1 wherein said para-selectivity enhancing conditions include contact of zeolite catalyst with treating agent at a temperature of from about 15° C. to 300° C. for a period of from about 0.1 to 25 hours, followed by calcination of the treated catalyst at a temperature of from about 300° C. to 600° C.
Claim 4
Dependent Claim
33 words
A process according to claim 2 wherein said zeolite catalyst contains from about 0.25% to 25% by weight of a modifying oxide selected from magnesium oxide, phosphorus oxide and mixtures of said oxides.
Claim 5
Dependent Claim
20 words
A process according to claim 3 wherein said zeolite is selected from ZSM-5, ZSM-11, ZSM-12, ZSM-23, ZSM-35, ZSM-38 and ZSM-48.
Claim 6
Dependent Claim
29 words
A process according to claim 3 wherein said halogen-based treating agent is provided in a treating medium comprising from about 5% to 100% by volume of said treating agent.
Claim 7
Dependent Claim
47 words
A process according to claim 5 wherein said treating medium is passed over said catalyst at the rate of from about 5 to 100 cc/min/gm catalyst at a temperature of from about 15° C. to 300° C. for a period of from about 0.1 to 1 hour.
Claim 8
Dependent Claim
17 words
A process according to claim 6 wherein said treating medium comprises 100% by volume of anhydrous HCl.
Claim 9
Dependent Claim
28 words
A process according to claim 1, 2, 3, 4, 5, 6 or 7 which comprises alkylation of an aromatic compound with an alkylating agent to produce dialkylbenzene compounds.
Claim 10
Dependent Claim
33 words
A process according to claim 8 wherein said aromatic compound is toluene and said alkylating agent contains from 1 to about 16 carbon atoms and is selected from olefins, alkyl halides and alkanols.
Claim 11
Dependent Claim
23 words
A process according to claim 1, 2, 3, 4, 5, 6 or 7 which comprises transalkylation of aromatic compounds to produce dialkylbenzene compounds.
Claim 12
Dependent Claim
24 words
A process according to claim 1, 2, 3, 4, 5, 6 or 7 which comprises disproportionation of alkylbenzenes to produce benzenes and dialkylbenzene compounds.
References Cited (Backward Citations)
US4278827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-11-29 | 1986-05-31 | 1986-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-29 | 1990-05-31 | 1990-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-29 | 1994-05-31 | 1994-11-30 | $7700.00 | Window Closed / Lapsed |