US2581344A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of distilled coke-oven benzene by distillation with added hydrocarbon material
Assignee: Beazer East Inc
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Filing: 1948-06-04
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Granted: 1952-01-08
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Expires: 1968-06-04
Abstract
No abstract record available.
Inventors
- 👤 John R Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:51
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD FOR THE PURIFICATION OF DISTILLED COKE-OVEN BENZENE WHICH CONTAINS A SMALL AMOUNT OF NON-AROMATIC HYDROCARBON IMPURITIES HIGHER BOILING THAN BENZENE AND SUBSTANTIALLY INSEPARABLE THEREFROM BY SIMPLE DISTILLATION, WHICH COMPRISES DISTILLING IN A FRACTIONAL DISTILLATION ZONE A MIXTURE OF SAID BENZENE AND ADDED NONAROMATIC HYDROCARBON MATERIAL, SAID HYDROCARBON MATERIAL BOILING NORMALLY BETWEEN 75* AND 85* C. AND BEING PRESENT IN SAID MIXTURE IN AN AMOUNT IN EXCESS OF THAT REQUIRED TO FORM AN AXEOTROPE WITH SAID BENZENE, REMOVING FROM SAID DISTILLATION ZONE THE AZETROPE OF BENZENE AND SAID HYDROCARBON MATERIAL AS AN OVERHEAD FRACTION, REMOVING AT LEAST A PORTION OF THE EXCESS HYDROCARBON MATERIAL AND SAID HIGH BOILING IMPURITIES FROM SAID DISTILLATION ZONE AS A DISTILLATION RESIDUE, SEPARATING BENZENE AND SAID HYDROCARBON MATERIAL BY DISTILLATION WITH A POLAR AZEOTROPIC AGENT IN A SECOND FRACTIONAL DISTILLATION ZONE AND RECOVERING PURIFIED BENZENE FREED OF HIGH BOILING NON-AROMATIC IMPURITIES FROM A FRACTION FROM SAID SECOND DISTILLATION ZONE.
Claim 2
Independent Claim
155 words
A METHOD FOR THE PURIFICATION OF DISTILLED COKE-OVEN BENZENE WHICH CONTAINS A SMALL AMOUNT OF NON-AROMATIC HYDROCARBON IMPURITIES HIGHER BOILING THAN BENZENE AND SUBSTANTIALLY INSEPARABLE THEREFROM BY SIMPLE DISTILLATION, WHICH COMPRISES DISTILLING IN A FRACTIONAL DISTILLATION ZONE A MIXTURE OF SAID BENZENE AND ADDED NONAROMATIC HYDROCARBON MATERIAL, SAID HYDROCARBON MATERIAL BOILING NORMALLY BETWEEN 75* AND 85* C. AND BEING PRESENT IN SAID MIXTURE IN AN AMOUNT IN EXCESS OF THAT REQUIRED TO FORM AN AXEOTROPE WITH SAID BENZENE, REMOVING FROM SAID DISTILLATION ZONE THE AZETROPE OF BENZENE AND SAID HYDROCARBON MATERIAL AS AN OVERHEAD FRACTION, REMOVING AT LEAST A PORTION OF THE EXCESS HYDROCARBON MATERIAL AND SAID HIGH BOILING IMPURITIES FROM SAID DISTILLATION ZONE AS A DISTILLATION RESIDUE, SEPARATING BENZENE AND SAID HYDROCARBON MATERIAL BY DISTILLATION WITH A POLAR AZEOTROPIC AGENT IN A SECOND FRACTIONAL DISTILLATION ZONE AND RECOVERING PURIFIED BENZENE FREED OF HIGH BOILING NON-AROMATIC IMPURITIES FROM A FRACTION FROM SAID SECOND DISTILLATION ZONE.
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) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |