US3653184A
Expired / Lapsed
US
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Separation of c{11 {0 aromatics mixture with production chromatography
Assignee: Mobil Oil AS
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Filing: 1970-06-08
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Granted: 1972-04-04
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Expires: 1990-06-08
Abstract
Abstract A mixture of C8 aromatics, ethylbenzene, ortho-xylene, metaxylene and para-xylene is separated into its component parts by production gas chromatography. The mixture is passed with a carrier in contact with a strongly polar liquid partitioning liquid to separate the ortho-xylene and ethylbenzene by different sorption rates and the remaining mixture of meta- and para-xylene is passed in contact with a certain zeolite to separate the paraxylene and meta-xylene by different sorption rates.
Inventors
- 👤 B M Drinkard
- 👤 Paul T Allen
- 👤 Edward H Unger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:06
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/02; B01D53/025; C; C07; C07C; C07C7/00; C07C7/135
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
11 words
A process according to claim 1 wherein the zeolite is ZSM-5.
Claim 2
Dependent Claim
11 words
A process according to claim 1 wherein the zeolite is ZSM-8.
Claim 3
Dependent Claim
37 words
A process according to claim 1 wherein said partitioning liquid phase is selected from from the group consisting of Zonyl E-7 on Chromosorb P, diethylene glycol succinate, polyethylene glycol, tetracyano ethylated pentaerythritol, and 1,2,3 tris (2-cyanoethoxy) propane.
Claim 4
Dependent Claim
22 words
A process according to claim 4 wherein the zeolite and partitioning liquid are maintained in columns through which the mixture is passed.
Claim 5
Dependent Claim
24 words
A process according to claim 5 wherein the column contaiNing the partitioning liquid has a diameter about thirty times greater than the zeolite column.
Claim 6
Dependent Claim
20 words
A process according to claim 6 wherein a carrier is admixed with the mixture prior to passage through the columns.
Claim 7
Dependent Claim
26 words
A process according to claim 7 wherein the carrier is selected from the group consisting of steam, water, nitrogen, air, helium, hydrogen, hydrocarbons and mixtures thereof.
Claim 8
Dependent Claim
19 words
A process according to claim 8 wherein the temperature maintained in the column is about 25* to 300* C.
Claim 9
Dependent Claim
14 words
A process according to claim 9 wherein the sorbed materials are recovered by desorbing.
Claim 10
Dependent Claim
28 words
A process according to claim 10 wherein the mixture contains about 5-15 weight percent ethylbenzene, 20-30 weight percent para-xylene, 40-50 weight percent mata-xylene and 15-25 weight percent ortho-xylene.
Claim 11
Dependent Claim
29 words
A process according to claim 11 wherein the zeolite is selected from the group consisting of ZSM-5 and ZSM-8 and the partitioning liquid is Zonyl E-7 on Chromosorb P.
References Cited (Backward Citations)
US3285701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |