Patent US4338054A successfully refreshed from Google Patents.
US4388408A
Expired / Lapsed
US
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Coker feedstock analysis method
Assignee: Sunoco Inc R&M
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Filing: 1980-12-22
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Granted: 1983-06-14
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Expires: 2000-12-22
Abstract
Abstract A clarified slurry oil coker feedstock is subjected to absorption chromatography and ultraviolet light adsorptivity and the results are correlated to determine the suitability of the feedstock for electrode grade coke.
Inventors
- 👤 Herbert P. Sien
- 👤 Thomas J. McGinley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:45
CPC Classifications
C; C10; C10B; C10B55/00; G; G01; G01N; G01N33/00; G01N33/26; G01N33/28; G01N33/2805; G01N30/00; G01N30/02; G01N2030/022; G01N2030/027
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
83 words
A method for determining the suitability of a clarified slurry oil from a fluidized bed catalytic cracking operation as a feedstock for electrode grade coke which comprises subjecting said feedstock to analysis of asphaltenes and U.V. absorptivity and selecting as suitable for coking those oils which show no more than 12 weight percent of asphaltenes and a minimum absorptivity in a 1 cm. cell of 40 , 19 and 15 liters per gm-cm., at wave lengths of 292, 324 and 340 nm., respectively.
Claim 2
Independent Claim
83 words
A method for determining the suitability of a clarified slurry oil from a fluidized bed catalytic cracking operation as a feedstock for electrode grade coke which comprises subjecting said feedstock to analysis of asphaltenes and U.V. absorptivity and selecting as suitable for coking those oils which show no more than 12 weight percent of asphaltenes and a minimum absorptivity in a 1 cm. cell of 40 , 19 and 15 liters per gm-cm., at wave lengths of 292, 324 and 340 nm., respectively.
Claim 3
Dependent Claim
12 words
The method of claim 1 wherein asphaltenes are determined by pentane solubility.
Claim 4
Dependent Claim
17 words
The method of claim 1 wherein asphaltenes are determined by absorption chromatography in a clay-silica gel column.
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) | 1986-06-13 | 1986-12-13 | 1987-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-13 | 1990-12-13 | 1991-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-13 | 1994-12-13 | 1995-06-14 | $7700.00 | Window Closed / Lapsed |