Patent US4341622A successfully refreshed from Google Patents.
US4341622A
Expired / Lapsed
US
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Manufacture of benzene, toluene and xylene
Assignee: Mobil Oil AS
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Filing: 1980-12-04
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Granted: 1982-07-27
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Expires: 2000-12-04
Abstract
Abstract Benzene, toluene and xylenes are prepared from heavy reformate in substantially the proportion in said reformate of single ring aromatic compounds bearing none, one or two methyl groups by contacting said heavy reformate at 800 DEG -1000 DEG F. with a zeolite of low acid activity.
Inventors
- 👤 Samuel A. Tabak
- 👤 Roger A. Morrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:10
CPC Classifications
C; C10; C10G; C10G45/00; C10G45/58; C10G45/60; C10G45/64; C10G2400/00; C10G2400/30
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
133 words
A process for the manufacture of aromatic hydrocarbons which comprises subjecting a hydrocarbon naphtha to catalytic reforming under conditions to convert naphthenes to aromatic hydrocarbons in a reformate reaction product, distilling said reformate to separate compounds of less than nine carbons from a heavy reformate, contacting said heavy reformate at 800°-1000° F. with a zeolite catalyst having a constraint index of 1 to 12, a silica/alumina ratio above about 12 and reduced acid activity 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, whereby to convert ethylbenzene and alkylbenzenes of more than eight carbon atoms to benzene, toluene and xylene, distilling the product of said contacting to separate benzene, toluene and xylene.
Claim 2
Dependent Claim
133 words
A process for the manufacture of aromatic hydrocarbons which comprises subjecting a hydrocarbon naphtha to catalytic reforming under conditions to convert naphthenes to aromatic hydrocarbons in a reformate reaction product, distilling said reformate to separate compounds of less than nine carbons from a heavy reformate, contacting said heavy reformate at 800°-1000° F. with a zeolite catalyst having a constraint index of 1 to 12, a silica/alumina ratio above about 12 and reduced acid activity 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, whereby to convert ethylbenzene and alkylbenzenes of more than eight carbon atoms to benzene, toluene and xylene, distilling the product of said contacting to separate benzene, toluene and xylene.
Claim 3
Dependent Claim
11 words
A process according to claim 1 wherein said zeolite is ZSM-5.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein said zeolite is in the acid form.
Claim 5
Dependent Claim
14 words
A process according to claim 1 wherein said contacting is conducted under hydrogen pressure.
Claim 6
Dependent Claim
17 words
A process according to claim 1 wherein said zeolite is associated with a metal of Group VIII.
Claim 7
Dependent Claim
16 words
A process according to claim 5 wherein said metal is a noble metal of Group VIII.
Claim 8
Dependent Claim
19 words
A process according to claim 1 wherein said heavy reformate is treated with a solvent to separate paraffins therefrom.
Claim 9
Dependent Claim
13 words
A process according to claim 1 wherein said heavy reformate contains paraffin hydrocarbons.
Claim 10
Dependent Claim
14 words
A process according to claim 1 wherein said silica/alumina ratio is greater than 200.
Claim 11
Dependent Claim
14 words
A process according to claim 9 wherein said silica/alumina ratio is greater than 500.
Claim 12
Dependent Claim
14 words
A process according to claim 5 wherein said metal is co-crystallized with said zeolite.
Claim 13
Dependent Claim
19 words
A process according to claim 1 wherein said acid activity is reduced by alkali metal cations in said zeolite.
Claim 14
Dependent Claim
16 words
A process according to claim 1 wherein said acid activity is reduced by steaming the zeolite.
Claim 15
Dependent Claim
11 words
A process according to claim 5 wherein said metal is platinum.
References Cited (Backward Citations)
US3945913A
Cited
US4078990A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-07-26 | 1986-01-25 | 1986-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-07-26 | 1990-01-25 | 1990-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-07-26 | 1994-01-25 | 1994-07-27 | $7700.00 | Window Closed / Lapsed |