US3625860A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for reactivating a reforming catalyst
Assignee: Gulf Research and Development Co
•
Filing: 1969-08-27
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Granted: 1971-12-07
•
Expires: 1989-08-27
Abstract
Abstract A method for activation and/or reactivation of noble metal-type catalysts employed in the reforming of hydrocarbons in the presence of hydrogen by treatment of such catalysts under particular conditions with a chloride-containing compound.
Inventors
- 👤 John A Condrasky
- 👤 Robert E Kline
- 👤 Stanley J Kwolek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/90; B01J23/96; Y; Y10; Y10S; Y10S502/00; Y10S502/514
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
45 words
Subjecting the substantially carbon-free catalyst to an oxygen treatment with a gas containing at least about 5 percent per volume of molecular oxygen at a temperature in the range from about 800* F. to about 1,150* F. for a period of at least 4 hours;
Claim 2
Dependent Claim
98 words
The process of claim 1 wherein the oxidative burn-off is effected by contacting the deactivated catalyst with a gas containing up to about 2 percent by volume of molecular oxygen, the oxygen treatment is conducted at a temperature of less than about 1,050* F. for a period of time from about 4 to about 36 hours, the reduction of the molecular oxygen-free catalyst is conducted at a temperature in the range from about 850* to about 950* F., and the chloride treatment of the reduced catalyst is effected at a temperature from about 700* to about 900* F.
Claim 3
Dependent Claim
36 words
The process of claim 1 wherein the drying of the catalyst is commenced during the oxidative burn-off of step (1) and is continued during the oxygen treatment, purging and reduction in steps (2), (3) and (4).
Claim 4
Dependent Claim
10 words
Purging the catalyst of molecular oxygen after the oxygen treatment;
Claim 5
Dependent Claim
22 words
Reducing the molecular oxygen-free catalyst by contacting it with hydrogen at a temperature from about 800* F. to about 1, 150* F.;
Claim 6
Dependent Claim
141 words
Subjecting the reduced catalyst to chloride treatment in the absence of hydrocarbons by contacting the catalyst with a nonmetallic chloride-containing compound in a quantity sufficient to provide from about 0.0005 to about 0.01 pound of chlorine per pound of catalyst, which cloride-containing compound is decomposable at contacting conditions, in the presence of a quantity of hydrogen at least equal to the stoichiometric aMount required to form hydrogen chloride with the chlorine obtained from the chloride compound while maintaining a partial pressure of chloride, considered as HCl, in the presence of the hydrogen in excess of 15 percent of the K.p value and in the substantial absence in the system of free oxygen and compounds that decompose at the treating conditions to produce free oxygen and at a temperature from about 500* F. to about 1,150* F. and under substantially nonoxidative conditions;
Claim 7
Dependent Claim
24 words
Prior to the chloride treatment, drying the catalyst to a water content no greater than about 0.01 pounds of water per pound of catalyst.
References Cited (Backward Citations)
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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) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |