Patent US2432999A successfully refreshed from Google Patents.
Patent US2532276A successfully refreshed from Google Patents.
US2532276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production and recovery of para-xylene
Assignee: Anglo Iranian Oil Co Ltd
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Filing: 1947-04-03
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Granted: 1950-12-05
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Expires: 1967-04-03
Abstract
No abstract record available.
Inventors
- 👤 Birch Stanley Francis
- 👤 Fidler Frederick Arnold
- 👤 Haresnape John Norman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:18
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/02; C07C15/067; C07C15/08; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732; C07C5/2735; C07C5/274; C07C5/2748; C07C5/2751; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
180 words
A PROCESS FOR THE PRODUCTION OF PARA-XYLENE FROM AN AROMATIC HYDROCARBON MIXTURE BOILING IN THE RANGE 135*C. TO 150*C. AND DERIVED FROM A MINERAL OIL SELECTED FROM THE GROUP COAL TAR AND PETROLEUM, WHEREIN THE MIXTURE IS FRACTIONALLY DISTILLED TO PROVIDE AN OVERHEAD FRACTION RICH IN ETHYL BENZENE, PARA-XYLENE AND META-XYLENE, AN INTERMEDIATE CUT RICH IN META-XYLENE AND A RESIDUE FRACTION RICH IN ORTHO-XYLENE, THE OVERHEAD FRACTION BEING PASSED TO A LOW TEMPERATURE FILTRATION ZONE WHEREIN PARA-XYLENE IS SEPARATED AS A SOLID, FRACTIONALLY DISTILLING THE RESIDUE OBTAINED FROM SAID LOW TEMPERATURE FILTRATION TO OBTAIN A PARA-XYLENE ENRICHED FRACTION CONTAINING AT LEAST 25% BY WEIGHT OF PARA-XYLENE AND A META-XYLENE ENRICHED FRACTION CONTAINING LESS THAN 10% BY WEIGHT OF PARA-XYLENE AND THEREAFTER SUBJECTING THE PARA-XYLENE ENRICHED FRACTION TO LOW TEMPERATURE FILTRATION FOR THE RECOVERY OF PARA-XYLENE AND SUBJECTING THE SAID METAXYLENE ENRICHED FRACTION TOGETHER WITH SAID INTERMEDIATE CUT RICH IN META-XYLENE TO CATALYTIC ISOMERISATION AT A TEMPERATURE WITHIN THE RANGE OF 260*C. TO 677*C. TO CONVERT AT LEAST PART OF SAID META-XYLENE TO PARA-XYLENE, AND RECOVERING PARA-XYLENE FROM THE ISOMERISATION PRODUCT.
Claim 2
Dependent Claim
180 words
A PROCESS FOR THE PRODUCTION OF PARA-XYLENE FROM AN AROMATIC HYDROCARBON MIXTURE BOILING IN THE RANGE 135*C. TO 150*C. AND DERIVED FROM A MINERAL OIL SELECTED FROM THE GROUP COAL TAR AND PETROLEUM, WHEREIN THE MIXTURE IS FRACTIONALLY DISTILLED TO PROVIDE AN OVERHEAD FRACTION RICH IN ETHYL BENZENE, PARA-XYLENE AND META-XYLENE, AN INTERMEDIATE CUT RICH IN META-XYLENE AND A RESIDUE FRACTION RICH IN ORTHO-XYLENE, THE OVERHEAD FRACTION BEING PASSED TO A LOW TEMPERATURE FILTRATION ZONE WHEREIN PARA-XYLENE IS SEPARATED AS A SOLID, FRACTIONALLY DISTILLING THE RESIDUE OBTAINED FROM SAID LOW TEMPERATURE FILTRATION TO OBTAIN A PARA-XYLENE ENRICHED FRACTION CONTAINING AT LEAST 25% BY WEIGHT OF PARA-XYLENE AND A META-XYLENE ENRICHED FRACTION CONTAINING LESS THAN 10% BY WEIGHT OF PARA-XYLENE AND THEREAFTER SUBJECTING THE PARA-XYLENE ENRICHED FRACTION TO LOW TEMPERATURE FILTRATION FOR THE RECOVERY OF PARA-XYLENE AND SUBJECTING THE SAID METAXYLENE ENRICHED FRACTION TOGETHER WITH SAID INTERMEDIATE CUT RICH IN META-XYLENE TO CATALYTIC ISOMERISATION AT A TEMPERATURE WITHIN THE RANGE OF 260*C. TO 677*C. TO CONVERT AT LEAST PART OF SAID META-XYLENE TO PARA-XYLENE, AND RECOVERING PARA-XYLENE FROM THE ISOMERISATION PRODUCT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-04 | 1954-06-05 | 1954-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-04 | 1958-06-05 | 1958-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-04 | 1962-06-05 | 1962-12-05 | $7700.00 | Window Closed / Lapsed |