US4207169A
Expired / Lapsed
US
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Process for the steam dealkylation of aromatic hydrocarbons
Assignee: IFP Energies nouvelles
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Filing: 1979-01-08
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Granted: 1980-06-10
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Expires: 1999-01-08
Abstract
Abstract Catalytic process for steam dealkylation of a charge containing at least one alkyl aromatic hydrocarbon, such as a charge issued from effluents of units for catalytic reforming or for producing aromatic hydrocarbons, wherein the catalyst contains an alumina carrier, from 0.1 to 1% of rhodium, from 0.05 to 1% of TiO2 and optionally from 0.1 to 1% of ruthenium, palladium, iridium, platinum or osmium and/or from 0.01 to 5% of lithium, sodium, potassium, rubidium or cesium.
Inventors
- 👤 Philippe Courty
- 👤 Germain Martino
- 👤 Jean-Francois Le Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:54
CPC Classifications
C; C10; C10G; C10G59/00; C10G59/02; B; B01; B01J; B01J23/00; B01J23/38; B01J23/40; B01J23/46; B01J23/54; B01J23/56; B01J23/70; B01J23/89; B01J23/8933; B01J23/8946; B01J37/00; B01J37/02; B01J37/0201; B01J37/0207; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/20; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2523/00; C07C2523/02; C07C2523/04; C07C2523/08; C07C2523/12; C07C2523/14; C07C2523/16; C07C2523/20; C07C2523/22; C07C2523/24; C07C2523/26; C07C2523/28; C07C2523/30; C07C2523/32; C07C2523/34; C07C2523/36; C07C2523/38; C07C2523/40; C07C2523/42; C07C2523/44; C07C2523/46; C07C2523/70; C07C2523/74; C07C2523/745; C07C2523/75; C07C2523/755; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
50 words
A process for steam dealkylation of a charge containing at least one alkyl aromatic hydrocarbon, in the presence of a catalyst containing an alumina carrier and, expressed by weight with respect to the catalyst, from 0.1 to 1% of rhodium and 0.05 to 1% of titanium oxide TiO 2 .
Claim 2
Dependent Claim
50 words
A process for steam dealkylation of a charge containing at least one alkyl aromatic hydrocarbon, in the presence of a catalyst containing an alumina carrier and, expressed by weight with respect to the catalyst, from 0.1 to 1% of rhodium and 0.05 to 1% of titanium oxide TiO 2 .
Claim 3
Dependent Claim
32 words
A process according to claim 1 wherein the catalyst contains, expressed by weight with respect to the catalyst, from 0.2 to 0.8% of rhodium and from 0.06 to 0.5% of titanium oxide.
Claim 4
Dependent Claim
37 words
A process according to claim 2, wherein the catalyst further contains, expressed by weight with respect to the catalyst, from 0.1 to 1% of at least one noble metal selected from ruthenium, palladium, iridium, platinum and osmium.
Claim 5
Dependent Claim
37 words
A process according to claim 2, wherein the catalyst further contains, expressed by weight, with respect to the catalyst, from 0.01 to 5% of at least one alkali metal selected from lithium, sodium, potassium, rubidium and cesium.
Claim 6
Dependent Claim
37 words
A process according to claim 3, wherein the catalyst further contains, expressed by weight with respect to the catalyst, from 0.01 to 5% of at least one alkali metal selected from lithium, sodium, potassium, rubidium and cesium.
Claim 7
Dependent Claim
54 words
A process according to claim 3, wherein the catalyst further contains, expressed by weight with respect to the catalyst, from 0.01 to 6% of at least one additional metal or compound of an additional metal selected from indium, zirconium, thorium, germanium, tin, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, manganese, rhenium, iron, cobalt and nickel.
Claim 8
Dependent Claim
41 words
A process according to claim 6, wherein the catalyst contains a noble metal of the platinum family selected from ruthenium, palladium and platinum and in which the additional metal or metal compound is selected from rhenium, germanium, vanadium, tantalum and niobium.
Claim 9
Dependent Claim
53 words
A process according to claim 4, wherein the catalyst further contains, expressed by weight with respect to the catalyst, from 0.01 to 6% of at least one additional metal or compound of additional metal selected from indium, zirconium, thorium, germanium, tin, vanadium, niobium, tantalum, chromium, molybdenum tungsten, manganese, rhenium, iron, cobalt and nickel.
Claim 10
Dependent Claim
61 words
A process according to claim 8, wherein the catalyst contains an alumina carrier, from 0.25 to 0.65% of rhodium, 0.07 to 0.3% of titanium oxide, an alkali metal selected from sodium, potassium and rubidium, and at least one additional metal or compound of additional metal selected from indium, tungsten, tin, manganese, chromium, molybdenum, iron, niobium, cobalt, vanadium, nickel, germanium and iron.
Claim 11
Dependent Claim
32 words
A process according to claim 9, wherein the additional metal or the compound of additional metal of the catalyst is selected from cobalt, nickel, indium, tin, chromium, molybdenum, tungsten, manganese and iron.
Claim 12
Dependent Claim
74 words
A process according to claim 5, wherein the catalyst contains an alumina carrier and, by weight, from 0.25 to 0.65% of rhodium, 0.07 to 0.3% of titanium oxide, 0.25 to 0.65% of a noble metal selected from ruthenium, palladium and platinum, an alkali metal and 0.01 to 6% of at least one additional metal or compound of additional metal selected from indium, tungsten, tin, manganese, chromium, iron, niobium, cobalt, vanadium, nickel, germanium and rhenium.
Claim 13
Dependent Claim
18 words
A process according to claim 11, wherein the catalyst contains rhodium, titanium oxide, palladium, iron, nickel and potassium.
Claim 14
Dependent Claim
14 words
A process according to claim 1, used for the dealkylation of toluene to benzene.
Claim 15
Dependent Claim
24 words
A process according to claim 1, used for dealkylating alkylaromatic hydrocarbons issued from effluents of units for catalytic reforming or for producing aromatic hydrocarbons.
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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) | 1983-06-10 | 1983-12-10 | 1984-06-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-06-10 | 1987-12-10 | 1988-06-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-06-10 | 1991-12-10 | 1992-06-10 | $7700.00 | Window Closed / Lapsed |