Patent US4999503A successfully refreshed from Google Patents.
US4584424A
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Process for separating ethylbenzene from xylenes by selective adsorption on a Beta zeolite
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1984-10-29
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Granted: 1986-04-22
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Expires: 2004-10-29
Abstract
Abstract The invention relates to a process for selectively adsorbing ethylbenzene from a stream containing one or more isomeric xylenes. The ethylbenzene is adsorbed on a Beta zeolite. Certain desorbents, of which paradiethylbenzene is preferred, give the zeolite good ethylbenzene selectively over the xylenes.
Inventors
- 👤 Denise M. Barthomeuf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:39
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
103 words
a process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with a Beta zeolite under conditions suitable for adorbing ethylbenzene by the zeolite; (b) passing a desorbent selected from the group consisting of monosubstituted benzene wherein said substituent contains a heteroatom selected from the group consisting of O, S, P, and halogens, monoalkylbenzenes having from 3 to 12 carbon atoms in the monoalkyl substituent and paradialkylbenzenes through the zeolite during or after the contacting step, and (c) recovering a stream enhanced in ethylbenzene concentration from the zeolite.
Claim 2
Dependent Claim
103 words
a process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with a Beta zeolite under conditions suitable for adorbing ethylbenzene by the zeolite; (b) passing a desorbent selected from the group consisting of monosubstituted benzene wherein said substituent contains a heteroatom selected from the group consisting of O, S, P, and halogens, monoalkylbenzenes having from 3 to 12 carbon atoms in the monoalkyl substituent and paradialkylbenzenes through the zeolite during or after the contacting step, and (c) recovering a stream enhanced in ethylbenzene concentration from the zeolite.
Claim 3
Dependent Claim
15 words
The process of claim 1 wherein the substituent on the monosubstituted benzene desorbent is iodine.
Claim 4
Dependent Claim
20 words
The process of claim 1 wherein the desorbent is a paradialkylbenzene selected from the group consisting of paradiethylbenzene and paramethyl-n-propylbenzene.
Claim 5
Dependent Claim
10 words
The process of claim 3 wherein the desorbent is paradiethylbenzene.
Claim 6
Dependent Claim
13 words
The process of claim 1 wherein the feedstream contains orthoxylene, metaxylene, and paraxylene.
Claim 7
Dependent Claim
13 words
The process of claim 5 wherein the feedstream is substantially depleted in paraxylene.
Claim 8
Dependent Claim
27 words
The process at claim 1 wherein the zeolite contains at least one cation selected from the group consisting of alkali and alkaline earth metals and mixtures thereof.
Claim 9
Dependent Claim
11 words
The process of claim 7 wherein the zeolite contains Rb cations.
Claim 10
Dependent Claim
11 words
The process of claim 7 wherein the zeolite contains K cations.
Claim 11
Dependent Claim
11 words
The process of claim 7 wherein the zeolite contains Cs cations.
Claim 12
Dependent Claim
11 words
The process of claim 7 wherein the zeolite contains Na cations.
Claim 13
Dependent Claim
68 words
A process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with an exchanged Beta zeolite under conditions suitable for adsorbing ethylbenzene by the zeolite, (b) passing a desorbent selected from the group consisting of n-butylbenzene, n-pentylbenzene, n-heptylbenzene, n-nonylbenzene, n-dodecylbenzene, iodobenzene, paradiethylbenzene, and paramethyl-n-propylbenzene through the zeolite during or after the contacting step,
Claim 14
Dependent Claim
68 words
A process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with an exchanged Beta zeolite under conditions suitable for adsorbing ethylbenzene by the zeolite, (b) passing a desorbent selected from the group consisting of n-butylbenzene, n-pentylbenzene, n-heptylbenzene, n-nonylbenzene, n-dodecylbenzene, iodobenzene, paradiethylbenzene, and paramethyl-n-propylbenzene through the zeolite during or after the contacting step,
Claim 15
Dependent Claim
11 words
(c) recovering a stream enhanced in ethylbenzene content from the zeolite.
Claim 16
Dependent Claim
11 words
(c) recovering a stream enhanced in ethylbenzene content from the zeolite.
Claim 17
Dependent Claim
13 words
The process of claim 12 wherein the feedstream contains orthoxylene, metaxylene and paraxylene.
Claim 18
Dependent Claim
13 words
The process of claim 13 wherein the feedstream is substantially depleted in paraxylene.
Claim 19
Dependent Claim
27 words
The process of claim 12 wherein the zeolite contains at least one cation selected from the group consiting of alkali and alkaline earth metals and mixtures thereof.
Claim 20
Dependent Claim
11 words
The process of claim 15 wherein the zeolite contains Rb cations.
Claim 21
Dependent Claim
11 words
The process of claim 15 wherein the zeolite contains K cations.
Claim 22
Dependent Claim
11 words
The process of claim 15 wherein the zeolite contains Cs cations.
Claim 23
Dependent Claim
11 words
The process of claim 15 wherein the zeolite contains Na cations.
Claim 24
Dependent Claim
68 words
A process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with a Beta zeolite containing Rb or Cs cations under conditions suitable for adsorbing ethylbenzene by the zeolite, (b) passing paradiethylbenzene through the zeolite during or after the contacted step, and (c) recovering a stream enhanced in ethylbenzene concentration from the zeolite.
Claim 25
Dependent Claim
68 words
A process for the separation of ethylbenzene from a feedstream containing ethylbenzene and at least one xylene isomer comprising the steps of: (a) contacting the feedstream with a Beta zeolite containing Rb or Cs cations under conditions suitable for adsorbing ethylbenzene by the zeolite, (b) passing paradiethylbenzene through the zeolite during or after the contacted step, and (c) recovering a stream enhanced in ethylbenzene concentration from the zeolite.
Claim 26
Dependent Claim
13 words
The process of claim 20 wherein the feedstream contains orthoxylene, metaxylene and paraxylene.
Claim 27
Dependent Claim
13 words
The process of claim 21 wherein the feedstream is substantially depleted in paraxylene.
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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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |