Patent US2945902A successfully refreshed from Google Patents.
US2945902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of improving the color of an aromatic hydrocarbon obtained from a hydroformate extract by treatment with maleic anhydride
Assignee: American Oil Co
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Filing: 1956-04-23
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Granted: 1960-07-19
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Expires: 1976-04-23
Abstract
No abstract record available.
Inventors
- 👤 Robert T Romans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:14
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/14875
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
181 words
THE METHOD OF IMPROVING BOTH THE COLOR AND COLOR STABILITY OF MONO-NUCLEAR AROMATIC HYDROCARBON OBTAINED AS A COMPONENT OF A NAPHTHA HYDROFORMATE EXTRACT WHICH CONTAINS OLEFINIC HYDROGARBON CONTAMINANTS NORMALLY PRESENT IN SAID EXTRACT, WHICH METHOD CONSISTS ESSENTIALLY OF TREATING A NAPHTHA HYDROFORMATE EXTRACT CONTAINING SAID MONO-NUCLEAR AROMATIC HYDROCARBON AND SAID OLEFIN HYDROCARBON CONTAMINANTS IN A CONTACTING ZONE WITH A HYDROCARBON SOLUTION OF MELEIC ANHYDRIDE WHICH CONTAINS AN AMOUNT OF MALEIC ANHYDRIDE GREATER THAN 0.2 WEIGHT PERCENT BASED ON TOTAL EXTRACT HYDROCARBONS PRESENT IN THE CONTACTING ZONE, DISTILLING AT LEAST A PART OF SAID TREATED NAPHTHA EXTRACT HYDROCARMONO-NUCLEAR AROMATIC HYDROCARBON SUBSTANTIALLY FREE OF SAID OLEFINIC CONTAMINANTS AS AN OVERHEAD HYDROCARBON PRODUCT AND A BOTTOMS FRACTION CONTAINING MALEIC AN HYDRIDE, MONO-NUCLEAR AROMATIC HYDROCARBON AND SAID OLEFINIC HYDROCARBON CONTAMINANTS, REMOVING A PART OF THE BOTTOMS FRACTIONS FOR PURGING OLEFIN HYDROCARBON CONTAMINANTS FROM THE SYSTEM AND RECYCLING THE REMAINDER OF THE BOTTOMS FRACTION AS SAID HYDROCARBON SOLUTION TO THE TREATING STEP TOGETHER WITH SUFFICIENT MALEIC ANHYDRIDE TO PROVIDE AT LEAST ABOUT 0.2 WEIGHT PERCENT CONCENTRATION THEREOF BASED ON TOTAL EXTRACT HYDROCARBONS IN SAID CONTACTING ZONE.
Claim 2
Independent Claim
181 words
THE METHOD OF IMPROVING BOTH THE COLOR AND COLOR STABILITY OF MONO-NUCLEAR AROMATIC HYDROCARBON OBTAINED AS A COMPONENT OF A NAPHTHA HYDROFORMATE EXTRACT WHICH CONTAINS OLEFINIC HYDROGARBON CONTAMINANTS NORMALLY PRESENT IN SAID EXTRACT, WHICH METHOD CONSISTS ESSENTIALLY OF TREATING A NAPHTHA HYDROFORMATE EXTRACT CONTAINING SAID MONO-NUCLEAR AROMATIC HYDROCARBON AND SAID OLEFIN HYDROCARBON CONTAMINANTS IN A CONTACTING ZONE WITH A HYDROCARBON SOLUTION OF MELEIC ANHYDRIDE WHICH CONTAINS AN AMOUNT OF MALEIC ANHYDRIDE GREATER THAN 0.2 WEIGHT PERCENT BASED ON TOTAL EXTRACT HYDROCARBONS PRESENT IN THE CONTACTING ZONE, DISTILLING AT LEAST A PART OF SAID TREATED NAPHTHA EXTRACT HYDROCARMONO-NUCLEAR AROMATIC HYDROCARBON SUBSTANTIALLY FREE OF SAID OLEFINIC CONTAMINANTS AS AN OVERHEAD HYDROCARBON PRODUCT AND A BOTTOMS FRACTION CONTAINING MALEIC AN HYDRIDE, MONO-NUCLEAR AROMATIC HYDROCARBON AND SAID OLEFINIC HYDROCARBON CONTAMINANTS, REMOVING A PART OF THE BOTTOMS FRACTIONS FOR PURGING OLEFIN HYDROCARBON CONTAMINANTS FROM THE SYSTEM AND RECYCLING THE REMAINDER OF THE BOTTOMS FRACTION AS SAID HYDROCARBON SOLUTION TO THE TREATING STEP TOGETHER WITH SUFFICIENT MALEIC ANHYDRIDE TO PROVIDE AT LEAST ABOUT 0.2 WEIGHT PERCENT CONCENTRATION THEREOF BASED ON TOTAL EXTRACT HYDROCARBONS IN SAID CONTACTING ZONE.
References Cited (Backward Citations)
GB352164A
Cited
US2431655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |