US4529828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of ortho-xylene
Assignee: Honeywell UOP LLC
•
Filing: 1984-05-29
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Granted: 1985-07-16
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Expires: 2004-05-29
Abstract
Abstract A process able to separate ortho-xylene from the other C 8 aromatics. In the process the ortho-xylene-containing feed mixture is contacted with an X-type zeolite having silver cations at exchangeable cationic sites which has been subjected to a reduction step. The ortho-xylene is selectively adsorbed onto the adsorbent. The feed is then removed from the absorbent and the ortho-xylene recovered by desorption with para-diethylbenzene. The process is particularly amenable to the simulated moving bed flow scheme.
Inventors
- 👤 George J. Antos
- 👤 Nancy J. Flint
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:20
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A process for separating ortho-xylene from a feed mixture comprising ortho-xylene and at least one other xylene isomer or ethylbenzene, which process comprises contacting, at adsorption conditions, said feed with an adsorbent consisting essentially of an X-type zeolite having silver cations at exchangeable cationic sites which has been subjected to a reduction step, which selectively adsorbs said ortho-xylene, removing said feed from said adsorbent, and recovering said ortho-xylene by desorption at desorption conditions with a desorbent material comprising paradiethylbenzene.
Claim 2
Dependent Claim
79 words
A process for separating ortho-xylene from a feed mixture comprising ortho-xylene and at least one other xylene isomer or ethylbenzene, which process comprises contacting, at adsorption conditions, said feed with an adsorbent consisting essentially of an X-type zeolite having silver cations at exchangeable cationic sites which has been subjected to a reduction step, which selectively adsorbs said ortho-xylene, removing said feed from said adsorbent, and recovering said ortho-xylene by desorption at desorption conditions with a desorbent material comprising paradiethylbenzene.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said adsorption and desorption conditions include a temperature within the range of from about 20° C. to about 250° C. and a pressure sufficient to maintain liquid phase.
Claim 4
Dependent Claim
17 words
The process of claim 1 wherein said X-type zeolite also has potassium cations at exchangeable cationic sites.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein said process is effected with a simulated moving bed flow system.
Claim 6
Dependent Claim
17 words
The process of claim 4 wherein said simulated moving bed flow system is of the countercurrent type.
Claim 7
Dependent Claim
19 words
The process of claim 4 wherein said simulated moving bed flow system is of the co-current high efficiency type.
Claim 8
Dependent Claim
14 words
The process of claim 1 wherein said adsorbent includes an amorphous inorganic oxide matrix.
Claim 9
Dependent Claim
19 words
The process of claim 1 wherein the reduction of said adsorbent is effected with hydrogen at an elevated temperature.
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |