US4093536A
Expired / Lapsed
US
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Catalytic cracking and dehydrocyclizing of alkanes using alkaline earth oxides promoted with manganese oxide and/or rhenium oxide
Assignee: Phillips Petroleum Co
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Filing: 1975-05-22
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Granted: 1978-06-06
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Expires: 1995-05-22
Abstract
Abstract Alkanes are catalytically converted employing a catalyst comprising at least one alkaline earth oxide together with a promoting amount of manganese oxide and/or rhenium oxide. When the catalyst is treated with an oxygen-containing gas, such as air, prior to contacting the alkanes conversion by cracking is favored. When the catalyst is treated with hydrogen prior to contacting the alkanes dehydrocyclization is favored. A composition of matter is disclosed suitable for use as a catalyst for converting alkanes.
Inventors
- 👤 Louis F. Heckelsberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:51
CPC Classifications
C; C07; C07C; C07C4/00; C07C4/02; C07C4/06; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; C07C5/412; C10; C10G; C10G11/00; C10G11/02; C10G11/04; C07C2523/00; C07C2523/02; C07C2523/16; C07C2523/32; C07C2523/34; C07C2523/36
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A method for catalytically converting alkanes comprising contacting the alkanes under converting conditions with a catalyst by forming a reaction mixture consisting essentially of said alkanes and a catalyst consisting essentially of components selected from the group consisting of: (A) two alkaline earth oxides and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide, (B) at least one alkaline earth oxide and a promoting amount of rhenium oxide, and (C) an alkaline earth oxide selected from the group consisting of strontium and barium and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide.
Claim 2
Independent Claim
121 words
A method for catalytically converting alkanes comprising contacting the alkanes under converting conditions with a catalyst by forming a reaction mixture consisting essentially of said alkanes and a catalyst consisting essentially of components selected from the group consisting of: (A) two alkaline earth oxides and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide, (B) at least one alkaline earth oxide and a promoting amount of rhenium oxide, and (C) an alkaline earth oxide selected from the group consisting of strontium and barium and a promoting amount of a promoter selected from the group consisting of manganese oxide and a mixture of manganese oxide and rhenium oxide.
Claim 3
Dependent Claim
31 words
The method of claim 1 wherein the promoting amount is in the range of from about 0.1 to about 30 parts by weight per 100 parts by weight alkaline earth oxide.
Claim 4
Dependent Claim
31 words
The method of claim 1 wherein the promoting amount is in the range of from about 1 to about 15 parts by weight per 100 parts by weight alkaline earth oxide.
Claim 5
Dependent Claim
25 words
The method of claim 1 wherein the alkaline earth oxide in (A) and (B) is selected from the group consisting of magnesium, calcium, and strontium.
Claim 6
Dependent Claim
59 words
The method of claim 1 wherein the alkanes are catalytically cracked employing the catalyst which is treated with dry air at a temperature in the range of from about 750° to about 1200° F (approximately 400° to about 650° C) for a period of time ranging from about 0.1 hour to about 20 hours prior to contacting said alkanes.
Claim 7
Dependent Claim
60 words
The method of claim 5 wherein the cracking temperature is in the range of from about 450° to about 600° C (842° to about 1112° F); wherein the cracking pressure is in the range of from about 0 to about 200 psig; and wherein the feed-to-catalyst contact time is in the range of from about 0.1 to about 50 seconds.
Claim 8
Dependent Claim
81 words
The method of claim 5 wherein the alkaline earth oxide in (A) and (B) is a mixture of magnesium oxide and calcium or strontium oxide, the weight ratio of magnesium oxide to calcium or strontium oxide is in the range of from about 20:1 to about 8:1, and the catalyst is treated at a temperature ranging from about 950° to about 1050° F (510° to about 566° C) for a period of time ranging from about 1 to about 4 hours.
Claim 9
Dependent Claim
78 words
The method of claim 1 wherein the alkanes are catalytically dehydrocyclized employing the catalyst which is treated with hydrogen at a temperature in the range of from about 750° to about 1200° F (approximately 400° to about 650° C) for a period of time ranging from about 0.1 hour to about 20 hours prior to contacting said alkanes, and wherein said alkanes are linear or branched substituted or unsubstituted alkanes having 6 or more carbon atoms per molecule.
Claim 10
Dependent Claim
28 words
The method of claim 8 wherein the alkanes contain carbon chains of at least 6 carbon atoms, either unsubstituted or substituted with one or more alkyl side chains.
Claim 11
Dependent Claim
62 words
The method of claim 8 wherein the dehydrocyclization temperature is in the range of from about 450° to about 600° C (842° to about 1112° F); wherein the dehydrocyclization pressure is in the range of from about 0 to about 200 psig; and wherein the feed to catalyst contact time is in the range of from about 0.1 to about 50 seconds.
Claim 12
Dependent Claim
82 words
The method of claim 8 wherein the alkaline earth oxide in (A) and (B) is a mixture of magnesium oxide and calcium or strontium oxide, the weight ratio of the magnesium oxide to calcium or strontium oxide is in the range of from about 100:1 to about 5:1, and the catalyst is treated at a temperature ranging from about 950° to about 1050° F (510° to about 566° C) for a period of time ranging from about 1 to about 4 hours.
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |