EP0089840A1
Expired / Lapsed
EP
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Process for producing an optically anisotropic carbonaceous pitch
Assignee: Tonen General Sekiyu KK
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Filing: 1983-03-21
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Granted: —
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Expires: 2003-03-21
Abstract
Abstract A process for producing an optically anisotropic carbonaceous pitch comprises (a) heat treating a starting material which preferably comprises a carbonaceous heavy oil, at conditions which will favour the formation of an anisotropic pitch phase; (b) stopping said heat treating at an early stage in said formation; (c) maintaining the thus partially treated material at a temperature in the range 200 to 400°C; (d) subjecting the material from step (c) to a settling treatment, while maintaining the material in a molten state; (e) removing the anisotropic pitch phase which separates in step (d); and (f) su;bjecting at least a portiion of the remaining material to an after-treatment including a heat treatment for forming and/or concentrating an anisotropic pitch phase therein. A preferred step (b) comprises stopping the heat treatment when a pitch is obtained having a globular optically anisotropic phase content of 5-50 wt.%, a quinoline-insoluble matter content of 2-20 wt.%, a quinoline-insoluble/benzene-soluble matter content of 5-40 wt.% and a softening point of the formed pitch as a whole of up to 200°C.
Inventors
- 👤 Takayuki Izumi
- 👤 Tsutomu Naito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 06:13
CPC Classifications
D; D01; D01F; D01F9/00; D01F9/08; D01F9/12; D01F9/14; D01F9/145; D01F9/155; C; C10; C10C; C10C3/00; C10C3/002; D01F9/15
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
127 words
A process for producing an optically anisotropic carbonaceous pitch characterised by the steps of: (a) heat treating a starting material which preferably comprises a carbonaceous heavy oil, at conditions which will favour the formation of an anisotropic pitch phase; (b) stopping said heat treating at an early stage in said formation; (c) maintaining the thus partially treated material at a temperature in the range 200 to 400 0 C ; (d) subjecting the material from step (c) to a settling treatment, while maintaining the material in a molten state; (e) removing the anistropic pitch phase which separates in step (d); and (f) subjecting at least a portion of the remaining material to an after-treatment including a heat treatment for forming and/or concentrating an anisotropic pitch phase therein.
Claim 2
Dependent Claim
127 words
A process for producing an optically anisotropic carbonaceous pitch characterised by the steps of: (a) heat treating a starting material which preferably comprises a carbonaceous heavy oil, at conditions which will favour the formation of an anisotropic pitch phase; (b) stopping said heat treating at an early stage in said formation; (c) maintaining the thus partially treated material at a temperature in the range 200 to 400 0 C ; (d) subjecting the material from step (c) to a settling treatment, while maintaining the material in a molten state; (e) removing the anistropic pitch phase which separates in step (d); and (f) subjecting at least a portion of the remaining material to an after-treatment including a heat treatment for forming and/or concentrating an anisotropic pitch phase therein.
Claim 3
Dependent Claim
99 words
A process as claimed in claim 1, wherein said heat treating step (a) comprises the step of subjecting the starting material to a thermal reaction at a temperature in the range from about 370 to 460°C in an inert gas stream; and wherein step (b) comprises the step of stopping the thermal reaction when a pitch is obtained having a globular optically anisotropic phase content of 5-50 wt.%, quinoline-insoluble matter content of 2-20 wt.%, a quinoline-insoluble/benzene-soluble matter content of 5-40 wt.% and a softening point of the formed pitch as a whole of up to 2 00 ° C.
Claim 4
Dependent Claim
83 words
A process as claimed in claim 1, wherein step (a) comprises the step of subjecting the starting material to a thermal reaction at a temperature in the range 370 to 460 C, and step (b) comprises the step of stopping the thermal reaction when a pitch is obtained having a quinoline-insoluble matter content of 2-10 wt.%, a benzene-soluble matter content of at least 60 wt.% and a softening point of the formed pitch as a whole of up to 1 50 C .
Claim 5
Dependent Claim
24 words
A process as claimed in claim 2 wherein the starting material is a heavy hydrocarbon oil, tar or pitch by-product of petroleum or coal.
Claim 6
Dependent Claim
28 words
A process as claimed in claim 2 or claim 4, wherein the settling step (d) is effected at a temperature in the range 250 to 400 0 C.
Claim 7
Dependent Claim
24 words
A process as claimed in claim 3, wherein the settling step (d) is effected at a temperature in the range 200 to 350 C.
Claim 8
Dependent Claim
30 words
A process as claimed in any one of claims 2 to 6, wherein said thermal reaction is carried out at a temperature in the range of from 400 to 430°C.
Claim 9
Dependent Claim
41 words
A process as claimed in any preceding claim wherein the after-treatment of step (f) includes a heat treatment step for making the material heavier, said heat treatment being continued until an optically isotropic phase content of 0-20 wt.% has been attained.
Claim 10
Dependent Claim
131 words
A process as claimed in any one of claims 1 to 7, wherein the after-treatment step (f) comprises a heat treatment step for making the material heavier, which step (f) is carried out at a temperature in the range 300 to 420°C, preferably 350 to 420°C,in an inert gas stream, and continued until said material has a globular optically anisotropic phase content of 20-70 wt.%, a quinoline-insoluble matter content of no higher than 25 wt.%, a quinoline-soluble/benzene-insoluble matter content of at least 25 wt.% and a softening point of up to 250°C; and further comprises a second settling step carried out at a temperature in the range of from 330-400°C, and a discharging step wherein a lower layer of the settled material mainly comprises globular optically anisotropic phase which is discharged.
Claim 11
Dependent Claim
58 words
1 0 . A process as claimed in claim 9, wherein the heat treatment step (f) for making the material heavier is continued until a pitch having a globular optically anisotropic phase content of 30-50 wt.%, a quinoline-insoluble matter content of up to 20 wt.% and a quinoline-soluble/benzene-insoluble matter content of at least 30 wt.% has been formed.
Claim 12
Dependent Claim
68 words
A process as claimed in claim 8, wherein the heat treatment for making the material heavier in the after-treatment step (f) further comprises a step of accelerating the thermal chemical reaction at a temperature in the range 370 to 420 C and a subsequent step of performing a thermal chemical reaction at a lower temperature in the range 300 to 370 0 C in an inert gas stream.
Claim 13
Dependent Claim
63 words
A process as claimed in any preceding claim, where the optically anisotropic carbonaceous pitch product has a softening point in the range 230 to 320 o C, a globular optically anisotropic phase content of at least 80 wt.%, an isotropic phase content of up to 20 wt.% and quinoline-insoluble matter content of not more than 70 wt.%, preferably not more than 40 wt.%.
References Cited (Backward Citations)
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