US3700745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrodealkylation process with promoted group viii metals
Assignee: Ashland LLC
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Filing: 1968-10-22
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Granted: 1972-10-24
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Expires: 1988-10-22
Abstract
Abstract A hydrodealkylation process comprising contacting alkyl aromatic hydrocarbons with a catalyst, including an active Group VIII metal, such as, platinum, rhodium, palladium, ruthenium and nickel, a promoter selected from the group of alkali, alkaline earth and rare earth metals, such as, potassium, rubidium, cesium, calcium, strontium, cerium and thorium, and an inert oxide support such as, gamma aluminas, silica-alumina, silica, silica-magnesia, alumina-magnesia and silica-zirconia at a temperature of 1,050* to 1,200* F, a pressure of 100 to 1,000 psig., a liquid hourly space velocity of 0.1 to 5 and a hydrogento-hydrocarbon mole ratio of 3-15/1.
Inventors
- 👤 Stephen M Kovach
- 👤 Ralph E Patrick
- 👤 Ronald A Kmecak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:34
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; C; C07; C07C; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C2521/00; C07C2521/02; C07C2521/04; C07C2521/06; C07C2521/08; C07C2521/10; C07C2523/00; C07C2523/10; C07C2523/12; C07C2523/38; C07C2523/40; C07C2523/42; C07C2523/44; C07C2523/46; C07C2523/70; C07C2523/74; C07C2523/755
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
141 words
A process wherein hydrodealkylating dealkylatable methyl-substituted aromatic hydrocarbons is the dominant reaction comprising: contacting the hydrocarbons with a catalyst consisting essentially of about 0.5 to 5 percent by weight of an active metal selected from the group consisting of platinum, rhodium, palladium, ruthenium, and nickel and about 1 to 10 percent by weight of a promoting metal selected from the group consisting of cerium, thorium, and mixtures thereof, both impregnated on an inert oxide carrier selected from the group consisting of alumina, silica, magnesia, zirconia, and mixtures thereof under conditions sufficient to effect said hydrodealkylation reaction, including a temperature of about 1, 050* to 1,200* F, a pressure of about 100 to 1,000 psig, a liquid hourly space velocity of about 0.1 to 5, and a gaseous hydrogen to inlet feed hydrocarbon mole ratio between about 3 and 15 to 1.
Claim 2
Dependent Claim
16 words
A process in accordance with claim 1 wherein the inert oxide carrier is a gamma alumina.
Claim 3
Dependent Claim
16 words
A process in accordance with claim 1 wherein the promoting metal is in its oxide form.
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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) | 1975-10-24 | 1976-04-24 | 1976-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-24 | 1980-04-24 | 1980-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-24 | 1984-04-24 | 1984-10-24 | $7700.00 | Window Closed / Lapsed |