Patent US2834715A successfully refreshed from Google Patents.
US2834715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of catalytic cracking feed
Assignee: Individual
•
Filing: 1954-06-03
•
Granted: 1958-05-13
•
Expires: 1974-06-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Pratt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/14; C10G11/18; C10G21/00; C10G21/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A METHOD FOR PREPARING A CHARGE OIL FOR CATALYTIC CRACKING, WHICH INLUDES THE STEPS OF: HEATING AN ATMOSPHERIC REDUCED CRUDE AND INTRODUCING IT INTO A VACUUM FLASH TOWER AT A TEMPERATURE SUFFICEINTLY HIGH TO MAINTAIN A FLASH TEMPERATURE WITHIN THE RANGE OF ABOUT 200* F. BELOW THAT AT WHICH SUBSTANTIAL THERMAL DECOMPOSITION BEGINS TO TAKE PLACE; WITHDRAWING A VACUUM DISTILLATE FROM SAID TOWER; WITHDRAWING FROM SAID TOWER A VACUUM BOTTOMS COMPRISED OF AT LEAST 25% OF THE OIL PRESENT IN SAID REDUCED CRUDE AND SUITABLE FOR CATALYTIC CRACKING; COOLING SAID VACUUM BOTTOMS, INTRODUCING SAID COOLED VACUUM BOTTOMS INTO A FRACTIONATION ZONE AND COUNTERCURRENTLY CONTACTING SAID COOLED VACUUM BOTTOMS THEREIN WITH NORMALLY GASEOUS HYDROCARBON SOLVENT AT TEMPERATURES WITHIN 100*F. OF THE CRITICAL TEMPERATURE OF SAID SOLVENT TO FRACTIONATE SAID VACUUM BOTTOMS INTO AN ASPHALTIC RAFFINATE AND A DECARBONIZED OIL EXTRACT HAVING A CONRADSON CARBON RESIDUE SUBSTANTIALLY LOWER THAN SAID VACUUM BOTTOMS; AND EMPLOYING THE MAJOR PARTS OF SAID VACUUM DISTILLATE AND SAID DECARBONIZED OIL IN FORMING A CATALYTIC CRACKING FEED.
Claim 2
Independent Claim
169 words
A METHOD FOR PREPARING A CHARGE OIL FOR CATALYTIC CRACKING, WHICH INLUDES THE STEPS OF: HEATING AN ATMOSPHERIC REDUCED CRUDE AND INTRODUCING IT INTO A VACUUM FLASH TOWER AT A TEMPERATURE SUFFICEINTLY HIGH TO MAINTAIN A FLASH TEMPERATURE WITHIN THE RANGE OF ABOUT 200* F. BELOW THAT AT WHICH SUBSTANTIAL THERMAL DECOMPOSITION BEGINS TO TAKE PLACE; WITHDRAWING A VACUUM DISTILLATE FROM SAID TOWER; WITHDRAWING FROM SAID TOWER A VACUUM BOTTOMS COMPRISED OF AT LEAST 25% OF THE OIL PRESENT IN SAID REDUCED CRUDE AND SUITABLE FOR CATALYTIC CRACKING; COOLING SAID VACUUM BOTTOMS, INTRODUCING SAID COOLED VACUUM BOTTOMS INTO A FRACTIONATION ZONE AND COUNTERCURRENTLY CONTACTING SAID COOLED VACUUM BOTTOMS THEREIN WITH NORMALLY GASEOUS HYDROCARBON SOLVENT AT TEMPERATURES WITHIN 100*F. OF THE CRITICAL TEMPERATURE OF SAID SOLVENT TO FRACTIONATE SAID VACUUM BOTTOMS INTO AN ASPHALTIC RAFFINATE AND A DECARBONIZED OIL EXTRACT HAVING A CONRADSON CARBON RESIDUE SUBSTANTIALLY LOWER THAN SAID VACUUM BOTTOMS; AND EMPLOYING THE MAJOR PARTS OF SAID VACUUM DISTILLATE AND SAID DECARBONIZED OIL IN FORMING A CATALYTIC CRACKING FEED.
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) | 1961-05-12 | 1961-11-11 | 1962-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-12 | 1965-11-11 | 1966-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-12 | 1969-11-11 | 1970-05-13 | $7700.00 | Window Closed / Lapsed |