US4029749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for manufacturing needle coke
Assignee: SANKO GAS CHEMICAL Co Ltd
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Filing: 1975-10-16
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Granted: 1977-06-14
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Expires: 1995-10-16
Abstract
Abstract A process is disclosed for manufacturing needle coke, which process involves the steps of comminuting a coal, dispersing it in a suitable solvent, subjecting the dispersion to hydrogenolysis liquefaction at 360°-480° C and 1-150 Kg/Cm 2 H 2 pressure, distilling the resultant ashless coal solution at 250°-600° C to remove impurities, and unreacted coal, and coking selected distillate fractions in a conventional coker.
Inventors
- 👤 Hisashi Murakami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:03
CPC Classifications
C; C10; C10B; C10B57/00; C10B57/08
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
80 words
A process for manufacturing needle coke which comprises crushing coal into comminuted particles; dispersing said comminuted particles into a suitable solvent; subjecting the dispersed particles to hydrogenolysis liquefaction at 360° -480° C and 1-150 Kg/Cm 2 of hydrogen pressure to obtain a liquefied coal solution; distilling the substantially ashless liquefied coal solution thus obtained at 250°-600° C to remove solid impurities and unreacted coal therefrom; and coking at least one selected distillate fraction of said distillation in a coking apparatus.
Claim 2
Dependent Claim
80 words
A process for manufacturing needle coke which comprises crushing coal into comminuted particles; dispersing said comminuted particles into a suitable solvent; subjecting the dispersed particles to hydrogenolysis liquefaction at 360° -480° C and 1-150 Kg/Cm 2 of hydrogen pressure to obtain a liquefied coal solution; distilling the substantially ashless liquefied coal solution thus obtained at 250°-600° C to remove solid impurities and unreacted coal therefrom; and coking at least one selected distillate fraction of said distillation in a coking apparatus.
Claim 3
Dependent Claim
49 words
The process of claim 1, wherein said crushing results in particles of 30 mesh size and smaller, said solvent is a distillate produced from coal and having a boiling point of between 140° and 400° C, and said coking is effected at temperatures of between 450° and 530° C.
Claim 4
Dependent Claim
24 words
The process according to claim 1, wherein a heavy oil obtained by coal tar distillation is added to said distillate fraction prior to coking.
Claim 5
Dependent Claim
23 words
The process according to claim 1, wherein a heavy oil obtained by petroleum distillation is added to said distillate fraction prior to coking.
Claim 6
Dependent Claim
21 words
The process according to claim 4, wherein said distillate fraction is coked at 450°-430° C for a period of 20-50 hours.
Claim 7
Dependent Claim
23 words
The process according to claim 1, wherein said distillate fraction is coked at 450°-530° C for a period of 20 14 50 hours.
Claim 8
Dependent Claim
23 words
The process according to claim 1, further comprising the step of calcining the coked distillate fraction at a temperature of 1300° -1600° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-13 | 1980-12-13 | 1981-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-13 | 1984-12-13 | 1985-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-13 | 1988-12-13 | 1989-06-14 | $7700.00 | Window Closed / Lapsed |