US4351979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of aromatic compounds
Assignee: Mobil Oil AS
•
Filing: 1981-04-24
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Granted: 1982-09-28
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Expires: 2001-04-24
Abstract
Abstract Isomerization of xylene admixed with other alkyl aromatics of at least eight carbon atoms and with normal or slightly branched paraffins is conducted at 600 DEG -800 DEG F. with a zeolite like zeolite ZSM-5 of reduced acid activity.
Inventors
- 👤 Arthur W. Chester
- 👤 Yung F. Chu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:54
CPC Classifications
C; C07; C07C; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2737; B; B01; B01J; B01J29/00; B01J29/04; B01J29/06; B01J29/40; B01J29/42; B01J29/44; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/18; C07C5/2754; B01J2229/00; B01J2229/10; B01J2229/26; B01J2229/30; B01J2229/36; B01J2229/42; C07C2529/00; C07C2529/04; C07C2529/06; C07C2529/064; C07C2529/068; C07C2529/40; C10; C10G; C10G2400/00; C10G2400/30; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
168 words
In a process for isomerizing the xylene content of a charge consisting essentially of eight carbon atom aromatic hydrocarbon compounds which mixture contains xylene, and ethylbenzene by contact at conversion conditions under hydrogen pressure with a catalyst comprising a zeolite having a silica/alumina ratio greater than 12 and a constraint index of 1 to 12, the improvement resulting in conversion of ethylbenzene to benzene which comprises adding to the charge 1 to 25 weight percent based on total charge of paraffin hydrocarbons having 3-12 carbon atoms and having no branching in excess of one methyl group on any carbon atom whereby the charge consists essentially of said eight carbon atom aromatic compounds and said paraffinic hydrocarbons, maintaining the conversion temperature between about 600° F. and about 800° F. and using such catalyst comprising a zeolite of reduced acidity such that less than 2 weight percent of xylene is converted to compounds other than xylene when contacted with said catalyst at 900° F., 200 psig and LHSV of 5.
Claim 2
Dependent Claim
168 words
In a process for isomerizing the xylene content of a charge consisting essentially of eight carbon atom aromatic hydrocarbon compounds which mixture contains xylene, and ethylbenzene by contact at conversion conditions under hydrogen pressure with a catalyst comprising a zeolite having a silica/alumina ratio greater than 12 and a constraint index of 1 to 12, the improvement resulting in conversion of ethylbenzene to benzene which comprises adding to the charge 1 to 25 weight percent based on total charge of paraffin hydrocarbons having 3-12 carbon atoms and having no branching in excess of one methyl group on any carbon atom whereby the charge consists essentially of said eight carbon atom aromatic compounds and said paraffinic hydrocarbons, maintaining the conversion temperature between about 600° F. and about 800° F. and using such catalyst comprising a zeolite of reduced acidity such that less than 2 weight percent of xylene is converted to compounds other than xylene when contacted with said catalyst at 900° F., 200 psig and LHSV of 5.
Claim 3
Dependent Claim
14 words
A process according to claim 1, wherein said zeolite is in the acid form.
Claim 4
Dependent Claim
11 words
A process according to claim 1, wherein said zeolite is ZSM-5.
Claim 5
Dependent Claim
13 words
A process according to claim 1, wherein said zeolite comprises alkali metal cations.
Claim 6
Dependent Claim
16 words
A process according to claim 1, wherein the concentration of said paraffin hydrocarbon is about 3%.
Claim 7
Dependent Claim
15 words
A process according to claim 1, wherein said zeolite is ZSM-5 which has been steamed.
Claim 8
Dependent Claim
20 words
A process according to claim 6, wherein the zeolite has been steamed to an Alpha value of 45 to 110.
Claim 9
Dependent Claim
12 words
A process according to claim 1, wherein the paraffin hydrocarbon is n-nonane.
Claim 10
Dependent Claim
15 words
A process according to claim 1, wherein the catalyst also contains a Group VIII metal.
Claim 11
Dependent Claim
14 words
A process according to claim 1, wherein said silica/alumina ratio is greater than 200.
Claim 12
Dependent Claim
14 words
A process according to claim 1, wherein said silica/alumina ratio is greater than 500.
Claim 13
Dependent Claim
127 words
A process for isomerization of xylenes which comprises charging hydrogen and a hydrocarbon mixture consisting essentially of aromatic hydrocarbons having eight carbon atoms and paraffin hydrocarbons of 3-12 carbon atoms having no branching in excess of one methyl group on any carbon atom to contact with a zeolite catalyst at a temperature of about 600°-800° F., a pressure above about 100 pounds per square inch and a weight hourly space velocity between 1 and about 200, said zeolite catalyst having a constraint index of 1 to 12, a silica to alumina ratio greater than 12 and a reduced acidity such that less than 2 weight percent of xylene is converted to other compounds when contacted with said catalyst at 900° F., 200 psig and LHSV of 5.
Claim 14
Dependent Claim
127 words
A process for isomerization of xylenes which comprises charging hydrogen and a hydrocarbon mixture consisting essentially of aromatic hydrocarbons having eight carbon atoms and paraffin hydrocarbons of 3-12 carbon atoms having no branching in excess of one methyl group on any carbon atom to contact with a zeolite catalyst at a temperature of about 600°-800° F., a pressure above about 100 pounds per square inch and a weight hourly space velocity between 1 and about 200, said zeolite catalyst having a constraint index of 1 to 12, a silica to alumina ratio greater than 12 and a reduced acidity such that less than 2 weight percent of xylene is converted to other compounds when contacted with said catalyst at 900° F., 200 psig and LHSV of 5.
Claim 15
Dependent Claim
13 words
The process of claim 12, wherein said zeolite is in the acid form.
Claim 16
Dependent Claim
15 words
The process of claim 12, wherein said silica to alumina ratio is greater than 200.
Claim 17
Dependent Claim
15 words
The process of claim 12, wherein said silica to alumina ratio is greater than 500.
Claim 18
Dependent Claim
16 words
The process of claim 12, wherein said zeolite has been steamed to achieve said reduced activity.
Claim 19
Dependent Claim
30 words
The process of claim 12, wherein said zeolite is composited with an inert matrix material in an amount such that the inert matrix constitutes at least 90% of the composite.
Claim 20
Dependent Claim
12 words
The process of claim 12, wherein said zeolite contains alkali metal cations.
Claim 21
Dependent Claim
11 words
The process of claim 12, wherein said paraffin hydrocarbon is n-nonane.
Claim 22
Dependent Claim
16 words
A process according to claim 12, wherein said paraffin hydrocarbon has more than six carbon atoms.
Claim 23
Dependent Claim
15 words
A process according to claim 12, wherein said catalyst also contains a Group VIII metal.
Claim 24
Dependent Claim
11 words
A process according to claim 21, wherein said metal is platinum.
Claim 25
Dependent Claim
18 words
A process according to claim 16, wherein said zeolite has been steamed to an Alpha value of 45-110.
References Cited (Backward Citations)
US4236996A
Cited
US4283584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |