US3665046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separation of para-xylene from mixtures of c8 aromatics utilizing crystalline aluminositicate adsorbents
Assignee: Universal Oil Products Co
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Filing: 1969-10-13
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Granted: 1972-05-23
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Expires: 1989-10-13
Abstract
Abstract A process for the separation of an aromatic hydrocarbon from a mixture of aromatic isomers using a crystalline aluminosilicate adsorbent. A feed mixture comprising at least two aromatic-type hydrocarbons is passed through a bed of a faujasite structured adsorbent wherein one of the aromatics is preferentially adsorbed within the adsorbent. A subsequent desorption step is then used to desorb the selectively adsorbed feed component.
Inventors
- 👤 Armand J De Rosset
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:01
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
13 words
The process of claim 1 further characterized in that said adsorbent contains lanthanum.
Claim 2
Dependent Claim
13 words
The process of claim 1 further characterized in that said adsorbent contains cerium.
Claim 3
Dependent Claim
13 words
The process of claim 1 further characterized in that said adsorbent contains praseodymium.
Claim 4
Dependent Claim
13 words
The process of claim 1 further characterized in that said adsorbent contains neodymium.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |