Patent US2810772A successfully refreshed from Google Patents.
US2810772A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production and recovery of paraxylene
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1953-12-07
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Granted: 1957-10-22
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Expires: 1973-12-07
Abstract
No abstract record available.
Inventors
- 👤 Rufus B Bennett
- 👤 Ralph L Dockendorff
- 👤 John M Powers
- 👤 Raymond A Speed
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:21
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0004; B01D9/0059; C; C07; C07C; C07C7/00; C07C7/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
223 words
A CONTINUOUS PROCESS FOR RECOVERING PARAXYLENE FROM A FEED STOCK CONSISTING OF A LIQUID MIXTURE OF HYDROCARBONS INCLUDING PARAXYLENE IN THE RANGE OF FROM ABOUT 15% TO 25% BY VOLUME AND AT LEAST ONE OTHER ISOMERIC XYLENE WHICH COMPRISES THE STEPS OF ESTABLISHING A FIRST BODY OF SLURRY CONSISTING OF PARAXYLENE CRYSTALS AND MOTHER LIQUID AND CONTINUOUSLY MAINTAINING SAID FIRST BODY SLURRY AT A TEMPERATURE OF ABOUT -80*F., ESTABLISHING A SECOND BODY OF SLURRY CONSISTING OF PARAXYLENE CRYSTALS AND MOTHER LIQUOR AND CONTINUOUSLY MAINTAINING SAID SECOND BODY OF SLURRY AT A TEMPERATURE OF ABOUT -90* TO ABOUT -105*F., CONTINUOUSLY CHARGING A STREAM OF SAID FEED STOCK TO SAIDFIRST BODY OF SLURRY CONTINUOUSLY CHARGING A TRANSFER STREAM OF FIRST BODY SLURRY TO SAID SECOND BODY, CONTINUOUSLY REMOVING A DISCHARGE STREAM FROM SAID SECOND BODY SLURRY AND SEPARATING A CAKE OF PARAXYLENE CRYSTALS FROM SAID DISCHARGE STREAM OF SECOND BODY SLURRY, SAID TRANSFER STREAM AND SAID DISCHARGE STREAM BEING REMOVED, RESPECTIVELY, FROM SAID FIRST AND SECOND BODIES AT THE SAME RATE AT WHICH SAID FEED STOCK IS CHARGED TO SAID FIRST BODY, SAID TRANSFER STREAM AND SAID DISCHARGE STREAM BEING REMOVED, RESPECTIVELY, FROM SAID FIRST AND SECOND BODIES AT A RATE SUFFICIENT TO PROVIDE FOR AN AVERAGE SLURRY RESIDENCE TIME OF FROM ABOUT 0.5 TO 3 HOURS IN EACH OF SAID FIRST AND SECOND BODIES.
Claim 2
Dependent Claim
223 words
A CONTINUOUS PROCESS FOR RECOVERING PARAXYLENE FROM A FEED STOCK CONSISTING OF A LIQUID MIXTURE OF HYDROCARBONS INCLUDING PARAXYLENE IN THE RANGE OF FROM ABOUT 15% TO 25% BY VOLUME AND AT LEAST ONE OTHER ISOMERIC XYLENE WHICH COMPRISES THE STEPS OF ESTABLISHING A FIRST BODY OF SLURRY CONSISTING OF PARAXYLENE CRYSTALS AND MOTHER LIQUID AND CONTINUOUSLY MAINTAINING SAID FIRST BODY SLURRY AT A TEMPERATURE OF ABOUT -80*F., ESTABLISHING A SECOND BODY OF SLURRY CONSISTING OF PARAXYLENE CRYSTALS AND MOTHER LIQUOR AND CONTINUOUSLY MAINTAINING SAID SECOND BODY OF SLURRY AT A TEMPERATURE OF ABOUT -90* TO ABOUT -105*F., CONTINUOUSLY CHARGING A STREAM OF SAID FEED STOCK TO SAIDFIRST BODY OF SLURRY CONTINUOUSLY CHARGING A TRANSFER STREAM OF FIRST BODY SLURRY TO SAID SECOND BODY, CONTINUOUSLY REMOVING A DISCHARGE STREAM FROM SAID SECOND BODY SLURRY AND SEPARATING A CAKE OF PARAXYLENE CRYSTALS FROM SAID DISCHARGE STREAM OF SECOND BODY SLURRY, SAID TRANSFER STREAM AND SAID DISCHARGE STREAM BEING REMOVED, RESPECTIVELY, FROM SAID FIRST AND SECOND BODIES AT THE SAME RATE AT WHICH SAID FEED STOCK IS CHARGED TO SAID FIRST BODY, SAID TRANSFER STREAM AND SAID DISCHARGE STREAM BEING REMOVED, RESPECTIVELY, FROM SAID FIRST AND SECOND BODIES AT A RATE SUFFICIENT TO PROVIDE FOR AN AVERAGE SLURRY RESIDENCE TIME OF FROM ABOUT 0.5 TO 3 HOURS IN EACH OF SAID FIRST AND SECOND BODIES.
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) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |