US3928481A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of polyphenyls
Assignee: Texaco Inc
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Filing: 1974-07-05
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Granted: 1975-12-23
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Expires: 1994-07-05
Abstract
Abstract Cyclohexyl benzenes may be selectively dehydrogenated to yield aromatics; by-products may be selectively removed by cracking.
Inventors
- 👤 Robert M Suggitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:17
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/12; C07C15/14; C07C5/00; C07C5/32; C07C5/367; C07C5/42; C07C5/48
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
37 words
The method which comprises dehydrogenating a naphthenyl benzene in a non-oxidative atmosphere at dehydrogenation conditions in the presence of non-acidic dehydrogenation catalyst thereby forming a dehydrogenated stream containing desired aromatic components; and recovering said desired aromatic components.
Claim 2
Independent Claim
37 words
The method which comprises dehydrogenating a naphthenyl benzene in a non-oxidative atmosphere at dehydrogenation conditions in the presence of non-acidic dehydrogenation catalyst thereby forming a dehydrogenated stream containing desired aromatic components; and recovering said desired aromatic components.
Claim 3
Dependent Claim
14 words
The method claimed in claim 1 wherein said dehyrogenation is carried out at 700*-1100*F.
Claim 4
Dependent Claim
29 words
The method claimed in claim 1 wherein said catalyst includes at least one metal selected from the group consisting of rhenium, Group VI B metals, and Group VIII metals.
Claim 5
Dependent Claim
14 words
The method claimed in claim 1 wherein said catalyst includes a Group VIII metal.
Claim 6
Dependent Claim
13 words
The method claimed in claim 1 wherein said catalyst includes a non-acidic support.
Claim 7
Dependent Claim
17 words
The method claimed in claim 1 wherein said catalyst includes a Group VIII metal on non-acidic alumina.
Claim 8
Dependent Claim
14 words
The method claimed in claim 1 wherein said naphthenyl benzene is cyclohexyl benzene se.
Claim 9
Dependent Claim
14 words
The method claimed in claim 7 wherein said naphthenyl benzene is a dicylohexyl benzene.
Claim 10
Independent Claim
52 words
The method which comprises dehydrogenating a dicyclohexyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing a Group VIII metal on a non-acidic support thereby forming a dehydrogenated stream containing terphenyl; and recovering said terphenyl.
Claim 11
Independent Claim
52 words
The method which comprises dehydrogenating a dicyclohexyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing a Group VIII metal on a non-acidic support thereby forming a dehydrogenated stream containing terphenyl; and recovering said terphenyl.
Claim 12
Dependent Claim
11 words
The method claimed in claim 9 wherein said temperature is 750*-1000*F.
Claim 13
Independent Claim
73 words
THE METHOD WHICH COMPRISES DEHYDROGENATING A NAPHTHENYL BENZENE IN A NON-OXIDATIVE ATMOSPHERE AT DEHYDROGENATION CONDITIONS IN THE PRESENCE OF NON-ACIDIC DEHYDROGENATION CATALYST THEREBY FORMING A DEHYDROGENATION STREAM CONTAINING (I) DESIRED AROMATIC COMPONENTS AND (II) UNDESIRED COMPONENTS HAVING A NAPHTHENYL-AROMATIC BOND; CRACKING SAID DEHYDROGENATION STREAM AT CRACKING CONDITIONS THEREBY RUPTURING AT LEAST A PORTION OF SAID NAPHTHENYLAROMATIC BONDS AND FOORMING LOWER BOILING PRODUCTS; SEPARATING SAID LOWER BOILING PRODUCTS; AND RECOVERING SAID DESIRED AROMATIC COMPONENTS.
Claim 14
Independent Claim
73 words
THE METHOD WHICH COMPRISES DEHYDROGENATING A NAPHTHENYL BENZENE IN A NON-OXIDATIVE ATMOSPHERE AT DEHYDROGENATION CONDITIONS IN THE PRESENCE OF NON-ACIDIC DEHYDROGENATION CATALYST THEREBY FORMING A DEHYDROGENATION STREAM CONTAINING (I) DESIRED AROMATIC COMPONENTS AND (II) UNDESIRED COMPONENTS HAVING A NAPHTHENYL-AROMATIC BOND; CRACKING SAID DEHYDROGENATION STREAM AT CRACKING CONDITIONS THEREBY RUPTURING AT LEAST A PORTION OF SAID NAPHTHENYLAROMATIC BONDS AND FOORMING LOWER BOILING PRODUCTS; SEPARATING SAID LOWER BOILING PRODUCTS; AND RECOVERING SAID DESIRED AROMATIC COMPONENTS.
Claim 15
Dependent Claim
11 words
The method claimed in claim 11 wherein said cracking is hydrocracking.
Claim 16
Dependent Claim
18 words
The method claimed in claim 11 wherein said cracking is carried out in the presence of acidic catalyst.
Claim 17
Dependent Claim
23 words
The method claimed in claim 11 wherein said cracking is carried out in the presence of a Group VIII metal on a silica-alumina.
Claim 18
Dependent Claim
15 words
The method claimed in claim 11 wherein said cracking is cracking carried out at 700*-1100*F.
Claim 19
Dependent Claim
26 words
The method claimed in claim 11 wherein said naphthenyl benzene contains at leAst one component selected from the group consisting of cyclohexyl benzenes and dicyclohexyl benzenes.
Claim 20
Independent Claim
106 words
The method which comprises dehydrogenating a naphthenyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing at least one metal selected from rhenium, Group VI B metals, and Group VIII metals thereby forming a dehydrogenated stream containing (i) desired aromatic components and (ii) undesired components having a naphthenyl-aromatic bond; hydrocracking said dehydrogenated stream at cracking conditions including temperature of 500*-800*F and 50-2000 psig thereby rupturing at least a portion of said naphthenyl-aromatic bonds and forming lower boiling products; separating said lower boiling products; and recovering said desired aromatic components.
Claim 21
Independent Claim
106 words
The method which comprises dehydrogenating a naphthenyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing at least one metal selected from rhenium, Group VI B metals, and Group VIII metals thereby forming a dehydrogenated stream containing (i) desired aromatic components and (ii) undesired components having a naphthenyl-aromatic bond; hydrocracking said dehydrogenated stream at cracking conditions including temperature of 500*-800*F and 50-2000 psig thereby rupturing at least a portion of said naphthenyl-aromatic bonds and forming lower boiling products; separating said lower boiling products; and recovering said desired aromatic components.
Claim 22
Independent Claim
114 words
The method which comprises dehydrogenating a charge stream containing dicyclohexyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing at least one metal selected from rhenium, Group VI B metals, and Group VIII metals thereby forming a dehydrogenated stream containing (i) desired terphenyl and (ii) undesired components having a naphthenyl-aromatic bond; hydrocracking said dehydrogenated steam at cracking conditions including temperature of 500*-800*F and 50-2000 psig in the presence of an acidic catalyst thereby rupturing at least a portion of said naphthenyl-aromatic bonds and forming lower boiling products; separating said lower boiling products; and recovering said desired terphenyl.
Claim 23
Independent Claim
114 words
The method which comprises dehydrogenating a charge stream containing dicyclohexyl benzene in a non-oxidative atmosphere at dehydrogenation conditions including pressure of 0-1000 psig and temperature of 700*-1100*F in the presence of a non-acidic dehydrogenation catalyst containing at least one metal selected from rhenium, Group VI B metals, and Group VIII metals thereby forming a dehydrogenated stream containing (i) desired terphenyl and (ii) undesired components having a naphthenyl-aromatic bond; hydrocracking said dehydrogenated steam at cracking conditions including temperature of 500*-800*F and 50-2000 psig in the presence of an acidic catalyst thereby rupturing at least a portion of said naphthenyl-aromatic bonds and forming lower boiling products; separating said lower boiling products; and recovering said desired terphenyl.
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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |