US3878087A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing resinous pitch
Assignee: Kureha Corp
•
Filing: 1973-05-16
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Granted: 1975-04-15
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Expires: 1993-05-16
Abstract
Abstract A process for producing a resinous pitch composition in powder form, wherein a crude oil or liquid fraction thereof is subjected to thermal cracking for acetylene production to obtain a tarry substance therefrom, the substance is then distilled at a specified temperature and under pressure to result in a pitch product having enhanced properties; and the product is finally ground into powder form.
Inventors
- 👤 Yoshio Kawai
- 👤 Tadashi Araki
- 👤 Kazuhiro Watanabe
- 👤 Ryoichi Takahashi
- 👤 Kazuo Noguchi
- 👤 Nobuo Hatazawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:57
CPC Classifications
C; C10; C10C; C10C3/00; C10C3/002; C08; C08L; C08L95/00; C10G; C10G27/00; C10G27/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
149 words
A PROCESS FOR PRODUCING A RESINOUS PITCH COMPOSITION WHICH CONSISTS ESSENTIALLY OF: A. SUBJECTING NAPHTHA TO THERMAL CRACKING FOR ACETYLENE PRODUCTION AT A TEMPERATURE OF FROM 1,100* TO 1,500*C. UNDER NORMAL PRESSURE WITH A HEAT MEDIUM SELECTED FROM THE GROUP CONSISTING OF COMBUSTION FLAME AND HIGH TEMPERATURE STEAM FOR A CONTACT TIME OF FROM 0.001 TO 0.1 SECOND TO PRODUCE A TARRY SUBSTANCE: B. FURTHER SUBJECTING SAID TARRY SUBSTANCE TO DISTILLATION UNDER PRESURE RANGING FROM NORMAL PRESSURE TO 10KG/CM2(ATM.) AT A TEMPERATURE OF FROM 250* TO 450*C. TO REMOVE LIGHT OIL FRACTIONS INCLUDING VOLATILE MATTER THEREFROM; AND C. GRINDING THE HEAT-TREATED PRODUCT INTO POWDER FORM HAVING A PARTICLE SIZE RANGE OF FROM 4 TO 200 MESHES, SAID GROUND PRODUCT BEING CHATACTERIZED BY A SOFTENING POINT OF FROM 150* TO 400*C., A BENZENE-INSOLUBLE COMPONENT OF FROM 50 TO 90% BY WEIGHT, AND A SPECIFIC GRAVITY OF FROM 1.2 TO 1.5.
Claim 2
Dependent Claim
149 words
A PROCESS FOR PRODUCING A RESINOUS PITCH COMPOSITION WHICH CONSISTS ESSENTIALLY OF: A. SUBJECTING NAPHTHA TO THERMAL CRACKING FOR ACETYLENE PRODUCTION AT A TEMPERATURE OF FROM 1,100* TO 1,500*C. UNDER NORMAL PRESSURE WITH A HEAT MEDIUM SELECTED FROM THE GROUP CONSISTING OF COMBUSTION FLAME AND HIGH TEMPERATURE STEAM FOR A CONTACT TIME OF FROM 0.001 TO 0.1 SECOND TO PRODUCE A TARRY SUBSTANCE: B. FURTHER SUBJECTING SAID TARRY SUBSTANCE TO DISTILLATION UNDER PRESURE RANGING FROM NORMAL PRESSURE TO 10KG/CM2(ATM.) AT A TEMPERATURE OF FROM 250* TO 450*C. TO REMOVE LIGHT OIL FRACTIONS INCLUDING VOLATILE MATTER THEREFROM; AND C. GRINDING THE HEAT-TREATED PRODUCT INTO POWDER FORM HAVING A PARTICLE SIZE RANGE OF FROM 4 TO 200 MESHES, SAID GROUND PRODUCT BEING CHATACTERIZED BY A SOFTENING POINT OF FROM 150* TO 400*C., A BENZENE-INSOLUBLE COMPONENT OF FROM 50 TO 90% BY WEIGHT, AND A SPECIFIC GRAVITY OF FROM 1.2 TO 1.5.
Claim 3
Dependent Claim
44 words
The process according to claim 1, further including the step of subjecting the substance obtained from the thermal cracking step to hydrogenation prior to said distillation step to cause transformation of a portion of the aromatic rings in said cracked naphtha into aliphatic rings.
References Cited (Backward Citations)
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US2305440A
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US2944958A
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US3318801A
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US3350295A
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US3617477A
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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) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |