US2856442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extractive distillation process
Assignee: California Research LLC
•
Filing: 1954-12-06
•
Granted: 1958-10-14
•
Expires: 1974-12-06
Abstract
No abstract record available.
Inventors
- 👤 Munk Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:52
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/04; C07C7/05; C07C7/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
IN A PROCESS FOR RECOVERING SUBSTANTIALLY PURE BENZENE FROM A CATALYTIC REFORMATE CONTAINING BENZENE, TOLUENE AND NONAROMATIC COMPONENTS, THE STEPS COMPRISING FREEING THE REFORMATE OF LIGHTER NONAROMATIC HYDROCARBON CONSTITUENTS; PASSING THE RESULTING BOTTOMS PRODUCT SO OBTAINED TO A RE-RUN COLUMN FROM WHICH A CONCENTRATE CONTAINING SUBSTANTIALLY ALL THE BENZENE CONTENT OF SAID REFORMATE, ALONG WITH NONAROMATIC COMPONENTS AND FROM ABOUT 0.2 TO 5% BY VOLUME OF TOLUENE, IS TAKEN OVERHEAD AND FROM WHICH A FRACTION COMPRISED IN MAJOR PORTION OF TOLUENE IS WITHDRAWN AS BOTTOMS; PASSING SAID CONCENTRATE TO AN EXTRATIVE DISTILLATION COLUMN, AND THERE CONTACTING THE CONCENTRATE WITH A SELECTIVE SOLVENT AT ELEVATED TEMPERATURES WHEREBY THE RELATIVELY LOW BOILING NONAROMATIC COMPONENTS ARE SEPARATED AS AN OVERHEAD PRODUCT, WHILE WITHDRAWING A BOTTOMS PRODUCT CONTAIN-
Claim 2
Dependent Claim
124 words
IN A PROCESS FOR RECOVERING SUBSTANTIALLY PURE BENZENE FROM A CATALYTIC REFORMATE CONTAINING BENZENE, TOLUENE AND NONAROMATIC COMPONENTS, THE STEPS COMPRISING FREEING THE REFORMATE OF LIGHTER NONAROMATIC HYDROCARBON CONSTITUENTS; PASSING THE RESULTING BOTTOMS PRODUCT SO OBTAINED TO A RE-RUN COLUMN FROM WHICH A CONCENTRATE CONTAINING SUBSTANTIALLY ALL THE BENZENE CONTENT OF SAID REFORMATE, ALONG WITH NONAROMATIC COMPONENTS AND FROM ABOUT 0.2 TO 5% BY VOLUME OF TOLUENE, IS TAKEN OVERHEAD AND FROM WHICH A FRACTION COMPRISED IN MAJOR PORTION OF TOLUENE IS WITHDRAWN AS BOTTOMS; PASSING SAID CONCENTRATE TO AN EXTRATIVE DISTILLATION COLUMN, AND THERE CONTACTING THE CONCENTRATE WITH A SELECTIVE SOLVENT AT ELEVATED TEMPERATURES WHEREBY THE RELATIVELY LOW BOILING NONAROMATIC COMPONENTS ARE SEPARATED AS AN OVERHEAD PRODUCT, WHILE WITHDRAWING A BOTTOMS PRODUCT CONTAIN-
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) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |