US3779899A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogenation of aromatic hydrocarbons
Assignee: Individual
•
Filing: 1971-05-03
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Granted: 1973-12-18
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Expires: 1991-05-03
Abstract
Abstract Aromatic hydrocarbons, particularly monocyclic hydrocarbons, are hydrogenated without substantial hydrocracking in the presence of a catalyst prepared by impregnating or ion-exchanging platinum onto a previously stabilized Y zeolite base, followed by drying and calcining at temperatures above 1,000* F. The final, hightemperature calcination gives markedly improved hydrogenation activity as compared to calcination at lower temperatures.
Inventors
- 👤 D Mears
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:08
CPC Classifications
B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/08; B01J29/10; B01J29/14; B01J29/146; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; B01J29/12; B01J29/126; C; C10; C10G; C10G2400/00; C10G2400/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
21 words
A hydrogenation process as defined in claim 1 wherein said Y zeolite is stabilized by incorporating therein zeolitic polyvalent metal cations.
Claim 2
Dependent Claim
47 words
A hydrogenation process as defined in claim 1 wherein said Y zeolite is at least about 80% in the decationized and/or hydrogen form, and has been stabilized by calcining in a steam atmosphere at temperatures between about 900* and 1,500* F., prior to the addition of platinum.
Claim 3
Dependent Claim
168 words
A process for the hydrogenation of benzene in a hydrocarbon feedstock composed mainly of C6 or C5-C6 hydrocarbons, which comprises contacting said feedstock plus added hydrogen and under hydrogenation conditions with a catalyst comprising a minor proportion of platinum dispersed by ion exchange onto a stabilized hydrogen and/or decationized Y zeolite containing less than about 1.5 weight-percent of Na2O, said catalyst having been prepared by subjecting an ammonium Y zeolite in which at least about 50 percent of the original zeolitic sodium has been replaced with ammonium ions to hydrothermal stabilization by heating in the presence of steam at a temperature between about 900* and 1,500* F. for a sufficient time to reduce the unit cell size to between about 24.20 and 24.55 A, then exchanging said platinum into the resulting stabilized zeolite, and finally calcining the platinum-containing catalyst at a temperature between about 1,100* and 1,600* F. in a substantially dry atmosphere for a sufficient time to reduce its loss on ignition to below about 4 weight-percent.
Claim 4
Dependent Claim
59 words
A hydrogenation process as defined in claim 4 wherein said hydrothermal stabilization treatment comprises at least two steam calcination steps at temperatures between about 900* and 1,500* F., with an intervening ammonium ion exchange treatment to reduce the final sodium content to below about 0.5 weight-percent Na2O and give a unit cell size between about 24.30 and 24.50 A.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |