US3686343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Paraxylene recovery with zeolite adsorbent
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1970-10-01
•
Granted: 1972-08-22
•
Expires: 1990-10-01
Abstract
Abstract This application relates to the separation of C8 aromatic mixtures and more particularly the separation of paraxylene from admixture with any combination of its isomers and/or ethylbenzene. The separation is accomplished by contacting a feed stream containing paraxylene and at least one other constituent selected from the group consisting of orthoxylene, metaxylene and ethylbenzene with a modified type Y zeolite containing predominantly potassium ions and having a unit-cell size of 24.50 to 24.75 Angstroms.
Inventors
- 👤 Roby Bearden Jr
- 👤 Richard J De Feo Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:05
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/02; B01J20/10; B01J20/16; B01J20/18; B01J20/186; C; C07; C07C; C07C7/00; C07C7/12; C07C7/13
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
19 words
The process of claim 1 wherein said type Y zeolite has a unit cell size of 24.60 to 24.70.
Claim 2
Dependent Claim
12 words
The process of claim 1 wherein said preferentially adsorbed component is paraxylene.
Claim 3
Dependent Claim
14 words
The process of claim 3 wherein said adsorption takes place in the liquid phase.
Claim 4
Dependent Claim
38 words
The process of claim 4 wherein said adsorption takes place in the liquid phase in the presence of inert carrier, said inert carrier being a liquid under adsorption conditions which may be readily separated from the C8 product.
Claim 5
Dependent Claim
16 words
The process of claim 5 wherein said inert carrier is a C2 to C18 aliphatic compound.
Claim 6
Dependent Claim
14 words
The process of claim 4 wherein said adsorption takes place in the vapor phase.
Claim 7
Dependent Claim
12 words
The process of claim 1 wherein said desorption is effected with steam.
Claim 8
Dependent Claim
80 words
A process for preferentially adsorbing paraxylene from admixture with at least one compound selected from the group consisting of meta xylene, ortho xylene and ethyl benzene which comprises contacting said mixture under adsorption conditions with a type Y zeolite in which 70 to 98 percent of the sodium ions have been replaced by potassium ions, said zeolite having a unit cell size of 24.50 to 24.75 Angstroms wherein said paraxylene is preferentially adsorbed and desorbing said paraxylene from said zeolite.
Claim 9
Dependent Claim
22 words
The process of claim 9 wherein said adsorption takes place in the liquid phase and in the presence of an inert carrier.
Claim 10
Dependent Claim
12 words
The process of claim 9 wherein said desorption is effected with steam.
Claim 11
Dependent Claim
15 words
The process of claim 9 wherein said desorption is effected with a polar displacing agent.
Claim 12
Dependent Claim
33 words
The process of claim 9 wherein the mixture is passed over the zeolite at a rate of 0.1 to 5 W/hr/W and adsorption takes place at a temperature of 200* to 800* F.
References Cited (Backward Citations)
US3126425A
Cited
US3114782A
Cited
US3130007A
Cited
US3506400A
Cited
US3558730A
Cited
US3626020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |