US5210333A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzene removal from hydrocarbon streams
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1992-09-30
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Granted: 1993-05-11
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Expires: 2012-09-30
Abstract
Abstract A method for the separation of benzene from a hydrocarbon stream, such as a gasoline boiling range stream, which comprises contacting the hydrocarbon stream with an adsorbent capable of selectively adsorbing the benzene from the stream, hydrogenating the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent. The hydrogenation of the benzene to cyclohexane facilitates the removal of the benzene from the adsorbent.
Inventors
- 👤 Richard J. Bellows
- 👤 Gary B. McVicker
- 👤 Joseph E. Baumgartner
- 👤 James P. Dennis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:31
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
25 words
A method of substantially removing adsorbed benzene from an adsorbent which comprises converting the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent.
Claim 2
Independent Claim
25 words
A method of substantially removing adsorbed benzene from an adsorbent which comprises converting the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the adsorbent has an average pore diameter greater than the size of a benzene molecule.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the benzene is converted to cyclohexane by catalytic hydrogenation.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein the cyclohexane is desorbed using a hydrocarbon desorbent.
Claim 6
Dependent Claim
24 words
The method of claim 4 wherein the hydrocarbon desorbent is an aromatic compound selected from benzene, toluene, xylene, ethyl benzene or a mixture thereof.
Claim 7
Dependent Claim
16 words
The method of claim 1 wherein the cyclohexane desorbed from the adsorbent is reconverted to benzene.
Claim 8
Independent Claim
52 words
A method for the substantial separation of benzene from a feed mixture comprising benzene and at least one other hydrocarbon, which method comprises contacting the feed mixture with an adsorbent capable of selectively adsorbing benzene from the feed mixture, converting the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent.
Claim 9
Independent Claim
52 words
A method for the substantial separation of benzene from a feed mixture comprising benzene and at least one other hydrocarbon, which method comprises contacting the feed mixture with an adsorbent capable of selectively adsorbing benzene from the feed mixture, converting the adsorbed benzene to cyclohexane, and desorbing the cyclohexane from the adsorbent.
Claim 10
Dependent Claim
20 words
The method of claim 7 wherein the feed mixture is a refinery process stream boiling in the gasoline boiling range.
Claim 11
Dependent Claim
11 words
The method of claim 7 wherein the adsorbent is a zeolite.
Claim 12
Dependent Claim
33 words
The method of claim 9 wherein the adsorbent is a cationic exchanged L, X, Y, or mordenite type zeolite, the cation being selected from alkali metals, alkaline earth metals and rare earth metals.
Claim 13
Dependent Claim
41 words
The method of claim 7 wherein the benzene is converted to cyclohexane by hydrogenation in the presence of a hydrogen activation catalyst, the catalyst being supported by the adsorbent either as the sole support material or admixed with another support material.
Claim 14
Dependent Claim
13 words
The method of claim 11 wherein the hydrogen activation catalyst is supported platinum.
Claim 15
Dependent Claim
22 words
The method of claim 7 wherein the benzene adsorption, conversion to cyclohexane, and cyclohexane desorption are conducted in the same reactor vessel.
Claim 16
Dependent Claim
12 words
The method of claim 7 wherein the desorbent is the feed mixture.
Claim 17
Dependent Claim
74 words
A continuous process for the substantial separation of benzene from a feed mixture comprising benzene and at least one other hydrocarbon, which process comprises: (i) contacting the feed mixture with an adsorbent capable of selectively adsorbing benzene from the feed mixture; (ii) converting the adsorbed benzene to cyclohexane; and (iii) desorbing the cyclohexane from the adsorbent using as desorbent the feed mixture, the benzene in the feed mixture displacing the cyclohexane from the adsorbent.
Claim 18
Dependent Claim
74 words
A continuous process for the substantial separation of benzene from a feed mixture comprising benzene and at least one other hydrocarbon, which process comprises: (i) contacting the feed mixture with an adsorbent capable of selectively adsorbing benzene from the feed mixture; (ii) converting the adsorbed benzene to cyclohexane; and (iii) desorbing the cyclohexane from the adsorbent using as desorbent the feed mixture, the benzene in the feed mixture displacing the cyclohexane from the adsorbent.
References Cited (Backward Citations)
US3265755A
Cited
JPS5598123A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-10 | 1996-11-09 | 1997-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-10 | 2000-11-09 | 2001-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-10 | 2004-11-09 | 2005-05-11 | $7700.00 | Window Closed / Lapsed |