Patent US3864422A successfully refreshed from Google Patents.
US3864422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cyclopentadiene removal from isoprene process streams
Assignee: Goodrich Corp
•
Filing: 1973-09-26
•
Granted: 1975-02-04
•
Expires: 1993-09-26
Abstract
Abstract An isoprene stream containing cyclopentadiene is contacted with benzoquinone or naphthoquinone to react with the cyclopentadiene and the stream is fractionated to reduce cyclopentadiene content.
Inventors
- 👤 Richard W Hein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:38
CPC Classifications
C; C07; C07C; C07C7/00; C07C7/148; C07C7/152
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
113 words
A PROCESS FOR THE REMOVALS OF CYCLOPENTADIENE FROM ISOPRENE COMPRISING (A) CONTACTING ISOPRENE CONTAINING FROM ABOUT 0.1% TO ABOUT 2% BY WEIGHT CYCLOPENTADIENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF BENZOQUINONE AND NAPHTHOQUINONE TO FORM A HIGH BOILING ADDUCT AND (B) REMOVING SAID ADDUCT FROM SAID ISOPRENE BY FRACTIONATION, THEREBY REDUCING CYCLOPENTADIENE LEVEL IN SAID ISOPRENE TO LESS THAN 1 PPM, WHEREIN SAID ISOPRENE CONTAINS FROM 0% WATER UP TO ABOUT SATURATION WITH WATER AND BEYOND TO ABOUT 1% FREE WATER, BENZOQUINONE OR NAPHTHOQUINONE IS IN A MOLAR RATIO TO CYCLOPENTADIENE OF FROM ABOUT 0.5/1 TO ABOUT 4/1, AND SAID CONTACTING OCCURS AT A TEMPERATURE FROM ABOUT 10*C. TO ABOUT 95*C.
Claim 2
Dependent Claim
113 words
A PROCESS FOR THE REMOVALS OF CYCLOPENTADIENE FROM ISOPRENE COMPRISING (A) CONTACTING ISOPRENE CONTAINING FROM ABOUT 0.1% TO ABOUT 2% BY WEIGHT CYCLOPENTADIENE WITH A COMPOUND SELECTED FROM THE GROUP CONSISTING OF BENZOQUINONE AND NAPHTHOQUINONE TO FORM A HIGH BOILING ADDUCT AND (B) REMOVING SAID ADDUCT FROM SAID ISOPRENE BY FRACTIONATION, THEREBY REDUCING CYCLOPENTADIENE LEVEL IN SAID ISOPRENE TO LESS THAN 1 PPM, WHEREIN SAID ISOPRENE CONTAINS FROM 0% WATER UP TO ABOUT SATURATION WITH WATER AND BEYOND TO ABOUT 1% FREE WATER, BENZOQUINONE OR NAPHTHOQUINONE IS IN A MOLAR RATIO TO CYCLOPENTADIENE OF FROM ABOUT 0.5/1 TO ABOUT 4/1, AND SAID CONTACTING OCCURS AT A TEMPERATURE FROM ABOUT 10*C. TO ABOUT 95*C.
Claim 3
Dependent Claim
37 words
A process of claim 1 wherein said benzoquinone or naphthoquinone is in a molar ratio to cyclopentadiene of from about 1.5/l to about 3/l, and said contacting occurs at a temperature from about 40*C. to about 65*C.
Claim 4
Dependent Claim
10 words
A process of claim 2 wherein said benzoquinone is para-benzoquinone.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |