Patent US3928169A successfully refreshed from Google Patents.
US3928169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of pitch substantially soluble in quinoline
Assignee: Carbochem Inc
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Filing: 1974-05-06
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Granted: 1975-12-23
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Expires: 1994-05-06
Abstract
Abstract A precursor for needle coke is produced by heat treatment under pressure of a heavy aromatic oil of coal tar origin. The oil is obtained from the distillation of coal tar and is preferably the distillate fraction boiling above 300*C. The precursor is a pitch of a DMFI content of 10 - 30% and substantially quinoline soluble. When processed to coke it yields a needle coke of a preferred orientation ratio above 80.
Inventors
- 👤 Edward Patrick Conroy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:33
CPC Classifications
C; C10; C10C; C10C1/00; C10C1/19
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
97 words
A PROCESS FOR PRODUCING PITCH FROM A COAL TAR MATERIAL COMPRISING DISTILLING SAID COAL TAR MATERIAL UNDER ATMOSPHERIC OR REDUCED PRESSURE TO PRODUCE A PITCH AND DISTILLATE OIL, SEPARATING FROM SAID DISTILLATE OIL A HEAVY CREOSOTE OIL FRACTION HAVING AT LEAST 90% OF ITS CONSTITUENTS BOILING ABOVE 300*C, SUBJECTING SAID CREOSOTE OIL FRACTION TO HEAT TREATMENT AT TEMPERATURES 400* - 470*C UNDER PRESSURE 15 - 500 PSIG TO PRODUCE A PITCH, AND TERMINATING SAID HEAT TREATMENT WHEN A PITCH HAVING A DMFI CONTENT BETWEEN 10 AND 30% AND A QI CONTENT NOT GREATER THAN 2% IS OBTAINED.
Claim 2
Dependent Claim
97 words
A PROCESS FOR PRODUCING PITCH FROM A COAL TAR MATERIAL COMPRISING DISTILLING SAID COAL TAR MATERIAL UNDER ATMOSPHERIC OR REDUCED PRESSURE TO PRODUCE A PITCH AND DISTILLATE OIL, SEPARATING FROM SAID DISTILLATE OIL A HEAVY CREOSOTE OIL FRACTION HAVING AT LEAST 90% OF ITS CONSTITUENTS BOILING ABOVE 300*C, SUBJECTING SAID CREOSOTE OIL FRACTION TO HEAT TREATMENT AT TEMPERATURES 400* - 470*C UNDER PRESSURE 15 - 500 PSIG TO PRODUCE A PITCH, AND TERMINATING SAID HEAT TREATMENT WHEN A PITCH HAVING A DMFI CONTENT BETWEEN 10 AND 30% AND A QI CONTENT NOT GREATER THAN 2% IS OBTAINED.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the time of treatment is between 1 and 24 hours.
Claim 4
Dependent Claim
19 words
The process of claim 1, wherein the heat treatment is carried out at a temperature between 420*C and 460*C.
Claim 5
Dependent Claim
23 words
The process of claim 1, wherein the said creosote oil fraction is subjected to heat treatment in a closed vessel under autogenous pressure.
Claim 6
Dependent Claim
47 words
The process of claim 1, wherein said creosote oil fraction is passed continuously through a heating zone under pressure to effect the heat treatment thereof and said pitch having a DMFI content between 10% and 30% and a QI content not greater than 2% is continuously withdrawn.
Claim 7
Dependent Claim
13 words
A pitch when produced according to the method as defined in claim 1.
References Cited (Backward Citations)
US3069347A
Cited
US3692663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |