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US4304658A
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Dehydrocyclization to aromatic hydrocarbons over rhodium catalyst
Assignee: Texaco Inc
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Filing: 1979-12-13
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Granted: 1981-12-08
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Expires: 1999-12-13
Abstract
Abstract Steam dehydrocyclization of paraffinic hydrocarbons to aromatic hydrocarbons is effected in the presence of supported catalyst, typically bearing rhodium and preferably chromium and potassium, and characterized by a pH less than about 8.
Inventors
- 👤 Russell R. Reinhard
- 👤 Tansukhlal G. Dorawala
- 👤 Edwin R. Kerr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:15
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/32; C07C5/373; C07C5/393; C07C5/41; C07C5/415; C07C5/417; B; B01; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/64; B01J23/652; B01J23/6522; B01J23/70; B01J23/89; B01J23/8933; B01J23/8946; B01J23/8993; C10; C10G; C10G35/00; C10G35/04; C10G35/06; C10G35/085
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
44 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon which comprises contacting said dehydrocyclizable hydrocarbon and steam at steam dehydrocyclization conditions with a catalyst composition, having a pH of less than about 8 , containing a porous support bearing a catalytic amount of rhodium.
Claim 2
Dependent Claim
44 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon which comprises contacting said dehydrocyclizable hydrocarbon and steam at steam dehydrocyclization conditions with a catalyst composition, having a pH of less than about 8 , containing a porous support bearing a catalytic amount of rhodium.
Claim 3
Dependent Claim
22 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst has a pH of 4.2-7.4.
Claim 4
Dependent Claim
23 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst has a pH of about 4.6-6.0.
Claim 5
Dependent Claim
23 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst has a pH of about 5.5.
Claim 6
Dependent Claim
28 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains a metal of Group VI B of the Periodic Table.
Claim 7
Dependent Claim
19 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains chromium.
Claim 8
Dependent Claim
22 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said porous support is an active alumina.
Claim 9
Dependent Claim
28 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains a metal of Group I A of the Periodic Table.
Claim 10
Dependent Claim
19 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains potassium.
Claim 11
Dependent Claim
23 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains a non-noble Group VIII metal.
Claim 12
Dependent Claim
22 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains rhodium, potassium and iron.
Claim 13
Dependent Claim
27 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst contains 0.1 w%-2.0 w% rhodium on a porous alumina support.
Claim 14
Dependent Claim
87 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein said catalyst is a(VIII).sub.2/n O:b(VI).sub.2/m O:c(IA).sub.2 O:d(Supp):eRh.sub.2/3 O wherein VIII represents a non-noble metal of Group VIII of the periodic table of valence n, Rh represents rhodium, VI represents metal of Group VI B of the Periodic Table of valence m, IA represents a metal of Group I A of the Periodic Table, Supp represents support, a is 0.0-0.75, b is 0-0.78, c is 0-0.17, d is 0.15-2.49, and e is 0.0012-0.024.
Claim 15
Dependent Claim
30 words
The process for steam dehydrocyclizing a dehydrocyclizable hydrocarbon as claimed in claim 13, wherein said catalyst contains (0.0-0.75) Fe.sub.2/3 O:(0-0.78) Cr.sub.2/3 O:(0-0.5) K.sub.2 O:(0.012-0.024) Rh.sub.2/3 O, and (0.15-2.49) gamma alumina.
Claim 16
Dependent Claim
25 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein the steam dehydrocyclizable hydrocarbon contains C 6 -C 9 paraffins.
Claim 17
Dependent Claim
21 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein the steam dehydrocyclizable hydrocarbon contains naphthenes.
Claim 18
Dependent Claim
31 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein the steam dehydrocyclizable hydrocarbon is a naphtha fraction boiling in the range of 140° F.-400° F.
Claim 19
Dependent Claim
25 words
The process for steam dehydrocyclizing a steam dehydrocyclizable hydrocarbon as claimed in claim 1, wherein the steam dehydrocyclization conditions include temperature of 700° F.-1150° F.
Claim 20
Dependent Claim
61 words
The process for steam dehydrocyclizing a steam dehydrocyclizable aliphatic hydrocarbon which comprises contacting said dehydrocyclizable aliphatic hydrocarbon and steam, in mole ratio of 1-50 steam: 1 hydrocarbon, with a catalyst, having a pH of 4.2-7.4, containing a porous support bearing 0.1 w%-2.0 w% rhodium, 1 w%-4 w% potassium, 0.5 w%-20 w% iron, 10 w%-38 w% chromium, and 38 w%-88 w% alumina.
Claim 21
Dependent Claim
61 words
The process for steam dehydrocyclizing a steam dehydrocyclizable aliphatic hydrocarbon which comprises contacting said dehydrocyclizable aliphatic hydrocarbon and steam, in mole ratio of 1-50 steam: 1 hydrocarbon, with a catalyst, having a pH of 4.2-7.4, containing a porous support bearing 0.1 w%-2.0 w% rhodium, 1 w%-4 w% potassium, 0.5 w%-20 w% iron, 10 w%-38 w% chromium, and 38 w%-88 w% alumina.
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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) | 1984-12-07 | 1985-06-08 | 1985-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-12-07 | 1989-06-08 | 1989-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-12-07 | 1993-06-08 | 1993-12-08 | $7700.00 | Window Closed / Lapsed |