US2824843A
Expired / Lapsed
US
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Treatment of calcium nickel phosphate-containing catalysts
Assignee: Dow Chemical Co
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Filing: 1953-02-20
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Granted: 1958-02-25
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Expires: 1973-02-20
Abstract
No abstract record available.
Inventors
- 👤 Andrew J Dietzler
- 👤 Charles R Noddings
- 👤 John W Corey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/185; B01J27/1853; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
108 words
A METHOD WHICH COMPRISES HEATING A CALCIUM NICKEL PHESPHATE CATALYST, WHICH CONTAINS AN AVERAGE OF FROM 6.3 TO 12 ATOMS OF CALCIUM PER ATOM OF NICKEL AND IS SUBSTANTIALLY FREE OF CARBONACEOUS MATERIAL, AT A TEMPERATURE OF FROM 650* TO 800* C. IN CONTACT WITH AT LEAST ONE GAS OF THE CLASS CONSISTING OF STEAM, OXYGEN, AND AIR FOR A TIME OF AT LEAST 5 HOURS AND SUFFICIENT TO INCREASE THE SELECTIVE ACTIVITY OF THE CATALYST, FOR CATAYLENE IN THE THERMAL DEHYDROGENATION OF A NORMAL BUTYLENE IN THE PRESENCE OF STREAM TO FORM BUTADIENE RATHER THAN CATALYZING SIDE REACTIONS, OVER THE SELECTIVE ACTIVITY INITIALLY POSSED BY THE CATALYST.
Claim 2
Independent Claim
108 words
A METHOD WHICH COMPRISES HEATING A CALCIUM NICKEL PHESPHATE CATALYST, WHICH CONTAINS AN AVERAGE OF FROM 6.3 TO 12 ATOMS OF CALCIUM PER ATOM OF NICKEL AND IS SUBSTANTIALLY FREE OF CARBONACEOUS MATERIAL, AT A TEMPERATURE OF FROM 650* TO 800* C. IN CONTACT WITH AT LEAST ONE GAS OF THE CLASS CONSISTING OF STEAM, OXYGEN, AND AIR FOR A TIME OF AT LEAST 5 HOURS AND SUFFICIENT TO INCREASE THE SELECTIVE ACTIVITY OF THE CATALYST, FOR CATAYLENE IN THE THERMAL DEHYDROGENATION OF A NORMAL BUTYLENE IN THE PRESENCE OF STREAM TO FORM BUTADIENE RATHER THAN CATALYZING SIDE REACTIONS, OVER THE SELECTIVE ACTIVITY INITIALLY POSSED BY THE CATALYST.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |