US3686346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic dehydrogenation
Assignee: Phillips Petroleum Co
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Filing: 1970-03-05
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Granted: 1972-08-22
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Expires: 1990-03-05
Abstract
Abstract In a dehydrogenation process, the feed stream is successively and continuously passed through at least two Sn/O/O catalyst beds wherein the first catalyst bed is essentially free of Group Ia and IIa metals and the remaining catalyst beds contain a substantial amount of Group Ia or IIa metal-containing materials. The reaction temperature is gradually increased as the amount of Group Ia or IIa metal is increased.
Inventors
- 👤 Emory W Pitzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:16
CPC Classifications
B; B01; B01J; B01J27/00; B01J27/14; B01J27/16; B01J27/18; B01J27/1802; B01J27/1813; C; C07; C07C; C07C5/00; C07C5/32; C07C5/327; C07C5/333; C07C5/3332; Y; Y10; Y10S; Y10S585/00; Y10S585/8995; Y10S585/906
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
127 words
A process according to claim 1 wherein each said catalyst in each said catalyst bed is prepared from at least one phosphorus-containing material and at least one tin-containing material, and each said catalyst in each said catalyst bed other than that said first catalyst bed further is prepared from a Group Ia metal or metal containing material, none of said materials are deleterious to dehydrogenation catalytic effects, and all of the elements in said materials other than phosphorus, tin, oxygen, and Group Ia metal have been volatilized by heating each said catalyst at least to the temperature at which said catalyst is used in said dehydrogenation process or removed from said catalyst by washing with a liquid that is non-deleterious to the catalytic effects of said catalyst.
Claim 2
Dependent Claim
60 words
A process according to claim 1 wherein three to six catalyst beds are employed, and the amount of said Group Ia metal in each successive catalyst bed after the first catalyst bed gradually increases from a minimum of 0.1 to a maximum of 10 weight percent of said Group Ia metal based on the total weight of each respective catalyst.
Claim 3
Dependent Claim
36 words
A process according to claim 3 wherein the amount of said Group Ia metal in each such successive catalyst bed gradually increases to a maximum of about 3 weight percent in the last said catalyst bed.
Claim 4
Dependent Claim
49 words
A process according to claim 1 wherein said dehydrogenation process is carried out at an inlet temperature in the first catalyst bed in the range of 700* to 1,000* F and at an outlet temperature in the last catalyst bed in the range of 900* to 1, 300* F.
Claim 5
Dependent Claim
32 words
A process according to claim 5 wherein said inlet temperature is in the range of 800* to 900* F and said outlet temperature is in the range of 1,000* to 1,100* F.
Claim 6
Dependent Claim
53 words
A process according to claim 1 wherein said dehydrogenation process is carried out at a pressure in the range of 0.05 to 250 psia, an oxygen-to-dehydrogenatable feed volume ratio of 0.1:1 to 3:1, at a steam-to-feed ratio of 0.1:1 to 100:1 and at a gaseous hourly space velocity of 50 to 5,000 v/v/hour.
Claim 7
Dependent Claim
60 words
A process according to claim 2 wherein said phosphorus-containing materials are employed in amounts sufficient to provide the final catalyst with from 0.1 to 16 weight percent phosphorus, and said tin-containing materials are employed in an amount sufficient to provide the final catalyst from 15 to 75 weight percent tin, each based on the total weight of the final catalyst.
Claim 8
Dependent Claim
46 words
A process according to claim 8 wherein said phosphorus-containing material is phosphoric acid, phosphorus pentoxide, or tin phosphate; said tin-containing material is stannic chloride, stannic sulfate, stannous sulfate, stannic oxide, or said tin phosphate; and said Group Ia metal-containing material is lithium chloride or lithium nitrate.
Claim 9
Dependent Claim
37 words
A process according to claim 9 wherein 1,3-butadiene is formed from butene in said feed stream, said phosphorus-containing material is tin phosphate, said tin-containing material is stannic oxide and said Group Ia metal-containing material is lithium nitrate.
Claim 10
Dependent Claim
25 words
A process according to claim 8 wherein said Group Ia containing material is a lithium containing material such that the Group Ia metal is lithium.
References Cited (Backward Citations)
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US3513215A
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US3501547A
Cited
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |