Patent US2844518A successfully refreshed from Google Patents.
US2844518A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conversion of hydrocarbons
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1954-03-16
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Granted: 1958-07-22
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Expires: 1974-03-16
Abstract
No abstract record available.
Inventors
- 👤 Forrest H Blanding
- 👤 Walter J Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:16
CPC Classifications
C; C10; C10G; C10G11/00; C10G11/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
217 words
IN A CATALYSTIC CRACKING PROCESS WHEREIN VIRGIN HYDROCARBON OIL HAVING A BOILING RANGE OF ABOUT 600*-1050*F. IS CRACKED IN THE PRESENCE OF A CATALYST AND THE VAPOROUS CRACKED PRODUCTS ARE CONTINUOUSLY FRACTIONATE INTO GASOLINE, HEATING OIL, CYCLE OIL AND BOTTOMS, AND CYCLE OIL IS TO BE CONTINUOUSLY RECYCLED TO THE CRACKING STEP AND THE SELECTED CYCLE OIL FRACTION IS CRACKED TO EXTINCTION, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CRACKING STEP AT A RELATIVELY LOW TOTAL CONVERSION TO COKE, GASOLINE AND LIGHTER PRODUCTS BELOW ABOUT 49% BY WEIGHT CALCULATED ON A ONCE THROUGH BASIS, CONTINUOUSLY FRACTIONATING THE CRACKED PRODUCTS TO RECOVER A CYCLE OIL FRACTION BOILING BETWEEN ABOUT 675* AND 900*F., RECYCLING AT LEAST 50% BY VOLUME OF SAID SELECTED CYCLE OIL FRACTION ON THE VIRGIN OIL FEED TO THE CRACKING STEP, THE AMOUNT OF RECYCLE OIL BEING RELATED TO THE WEIGHT PER CENT OF TOTAL CARBON IN THE RINGS OF THE AROMATIC RING HYDROCARBON COMPOUND CONTENT OF THE VIRGIN OIL FEED AND ALSO TO THE AMOUNT OF VIRGIN OIL FEED CORRESPONDING IN BOILING RANGE TO THAT OF SAID SELECTED RECYCLE OIL FRACTION,M THE AMOUNT OF RECYCLE OIL FOR A SELECTED SET OF CONDITIONS INCREASING AS THE WEIGHT PERCENT TOTAL CARBON IN THE RINGS OF THE AROMATIC RING HYDROCARBON COMPOUND CONTENT INCREASES IN THE VIRGIN OIL FEED.
Claim 2
Dependent Claim
217 words
IN A CATALYSTIC CRACKING PROCESS WHEREIN VIRGIN HYDROCARBON OIL HAVING A BOILING RANGE OF ABOUT 600*-1050*F. IS CRACKED IN THE PRESENCE OF A CATALYST AND THE VAPOROUS CRACKED PRODUCTS ARE CONTINUOUSLY FRACTIONATE INTO GASOLINE, HEATING OIL, CYCLE OIL AND BOTTOMS, AND CYCLE OIL IS TO BE CONTINUOUSLY RECYCLED TO THE CRACKING STEP AND THE SELECTED CYCLE OIL FRACTION IS CRACKED TO EXTINCTION, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE CRACKING STEP AT A RELATIVELY LOW TOTAL CONVERSION TO COKE, GASOLINE AND LIGHTER PRODUCTS BELOW ABOUT 49% BY WEIGHT CALCULATED ON A ONCE THROUGH BASIS, CONTINUOUSLY FRACTIONATING THE CRACKED PRODUCTS TO RECOVER A CYCLE OIL FRACTION BOILING BETWEEN ABOUT 675* AND 900*F., RECYCLING AT LEAST 50% BY VOLUME OF SAID SELECTED CYCLE OIL FRACTION ON THE VIRGIN OIL FEED TO THE CRACKING STEP, THE AMOUNT OF RECYCLE OIL BEING RELATED TO THE WEIGHT PER CENT OF TOTAL CARBON IN THE RINGS OF THE AROMATIC RING HYDROCARBON COMPOUND CONTENT OF THE VIRGIN OIL FEED AND ALSO TO THE AMOUNT OF VIRGIN OIL FEED CORRESPONDING IN BOILING RANGE TO THAT OF SAID SELECTED RECYCLE OIL FRACTION,M THE AMOUNT OF RECYCLE OIL FOR A SELECTED SET OF CONDITIONS INCREASING AS THE WEIGHT PERCENT TOTAL CARBON IN THE RINGS OF THE AROMATIC RING HYDROCARBON COMPOUND CONTENT INCREASES IN THE VIRGIN OIL 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) | 1961-07-21 | 1962-01-20 | 1962-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-21 | 1966-01-20 | 1966-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-21 | 1970-01-20 | 1970-07-22 | $7700.00 | Window Closed / Lapsed |