Patent US3969068A successfully refreshed from Google Patents.
Patent US3215749A successfully refreshed from Google Patents.
US3215749A
Expired / Lapsed
US
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Process for producing naphthalene
Assignee: Sunoco Inc
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Filing: 1961-05-18
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Granted: 1965-11-02
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Expires: 1981-05-18
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Johnson
- 👤 Jr Alfred Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:16
CPC Classifications
C; C07; C07C; C07C15/00; C07C15/20; C07C15/24; C07C4/00; C07C4/08; C07C4/12; C07C4/14; C07C4/16; C07C5/00; C07C5/22; C07C5/27; C07C5/2729; C07C5/2732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
122 words
PROCESS FOR PRODUCING NAPHTHALENE FROM AN AROMATIC HYDRACARBON CHARGE STOCK COMPRISING A MIXTURE OF ALKYL NAPHTHALENES WHICH COMPRISES SUBJECTING SAID CHARGE STOCK IN THE PRESENCE OF HYDROGEN TO A TEMPERATURE IN THE RANGE OF 1000-1500*F., WHEREBY PARTIAL DEALKYLATION OF ALKYL NAPHTHALENES OCCURS AND ALKYL GROUPS IN THE ALPHA POSITION ARE REMOVED AT A RATE FASTER THAN ALKYL GROUPS IN THE BETA POSITION; DISTILLING THE REACTION PRODUCT TO OBRAIN A NAPHTHALENE FRACTION AND AN ALKYL NAPHTHALENE FRACTION; SUBJECTING SAID ALKYL NAPHTHALENE FRACTION TO ISOMERIZING CONDITIONS EFFECTIVE TO SHIFT THE POSITION OF ALKYL GROUPS ON THE NAPHTHALENE NUCLEUS, WHEREBY AN ALKYL NAPHTHALENE PRODUCT HAVING AN INCREASED CONTENT OF ALPHA ALKYL NAPHTHALENES IS OBTAINED; AND RECYCLING SAID ALKYL NAPHTHALENE PRODUCIT TO THE PARTIAL DEALKYLATION STEP.
Claim 2
Dependent Claim
122 words
PROCESS FOR PRODUCING NAPHTHALENE FROM AN AROMATIC HYDRACARBON CHARGE STOCK COMPRISING A MIXTURE OF ALKYL NAPHTHALENES WHICH COMPRISES SUBJECTING SAID CHARGE STOCK IN THE PRESENCE OF HYDROGEN TO A TEMPERATURE IN THE RANGE OF 1000-1500*F., WHEREBY PARTIAL DEALKYLATION OF ALKYL NAPHTHALENES OCCURS AND ALKYL GROUPS IN THE ALPHA POSITION ARE REMOVED AT A RATE FASTER THAN ALKYL GROUPS IN THE BETA POSITION; DISTILLING THE REACTION PRODUCT TO OBRAIN A NAPHTHALENE FRACTION AND AN ALKYL NAPHTHALENE FRACTION; SUBJECTING SAID ALKYL NAPHTHALENE FRACTION TO ISOMERIZING CONDITIONS EFFECTIVE TO SHIFT THE POSITION OF ALKYL GROUPS ON THE NAPHTHALENE NUCLEUS, WHEREBY AN ALKYL NAPHTHALENE PRODUCT HAVING AN INCREASED CONTENT OF ALPHA ALKYL NAPHTHALENES IS OBTAINED; AND RECYCLING SAID ALKYL NAPHTHALENE PRODUCIT TO THE PARTIAL DEALKYLATION STEP.
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) | 1968-11-01 | 1969-05-03 | 1969-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-01 | 1973-05-03 | 1973-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-01 | 1977-05-03 | 1977-11-02 | $7700.00 | Window Closed / Lapsed |