EP0087749A1
Expired / Lapsed
EP
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Pitch as a raw material for making carbon fibers and process for producing the same
Assignee: Eneos Corp
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Filing: 1983-02-23
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Granted: —
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Expires: 2003-02-23
Abstract
Abstract A pitch is disclosed which is used as a raw material for making carbon fibers. The pitch has a quinoline insoluble content of 7-18% by weight and a toluene insoluble content of 70-90% by weight. Further, the pitch preferably has a n-heptane soluble content of 1.0% by weight or less. A process for producing the pitch is also disclosed. The process comprises carrying out thermal modification of a petroleum heavy residual oil having a boiling point of 400°C or more (atmospheric pressure) and a sulfur content of 1.5% by weight or less. Insoluble substances are then separated and removed by heating at a temperature of 380°C or less. Thereafter, a low boiling point fraction is removed by vacuum distillation. The pitch can be utilized to produce carbon fibers without breaking of filaments in spinning or adhesion by fusion of the fibers in infusiblization. The carbon fibers produced have a high tensile strength and high modulus of elasticity.
Inventors
- 👤 Kunihiko Moriya
- 👤 Kazuhito Tate
- 👤 Goro Muroga
- 👤 Kazuhiro Yanagida
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 18:55
CPC Classifications
C; C10; C10C; C10C3/00
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
33 words
A pitch used as a raw material for carbon fibers which has a quinoline insoluble content of 7 to 18% by weight and a toluene insoluble content of 70 to 90% by weight.
Claim 2
Dependent Claim
33 words
A pitch used as a raw material for carbon fibers which has a quinoline insoluble content of 7 to 18% by weight and a toluene insoluble content of 70 to 90% by weight.
Claim 3
Dependent Claim
26 words
A pitch used as a raw material for carbon fibers according to Claim 1 which has a n-heptane soluble content of 1.0% by weight or less.
Claim 4
Dependent Claim
50 words
A pitch used as a raw material for carbon fibers according to Claim 1, wherein the pitch has a quinoline insoluble content of 7 to 18% by weight and a toluene insoluble content of 75 to 90% by weight and a n-heptane soluble content of 1.0% by weight or less.
Claim 5
Dependent Claim
28 words
A pitch used as a raw material for carbon fibers according to Claim 3, wherein the pitch has a toluene insoluble content of 80 to 90% by weight.
Claim 6
Dependent Claim
27 words
A pitch used as a raw material or carbon fibers according to Claim 4, wherein the pitch has a n-heptane content of 1.0% by weight or less.
Claim 7
Dependent Claim
95 words
. A process for producing a pitch used as a raw material for carbon fibers, the pitch having a quinoline insoluble content of 7 to 18% by weight and a toluene insoluble content of 70 to 90% by weight, which comprises carrying out thermal modification of a petroleum heavy residual oil having a boiling point of 400°C or more (atmospheric pressure) and a sulfur content of 1.5% by weight or less, separating and removing insoluble substances with heating at a temperature of 380°C or less, and removing a low boiling point fraction by vacuum distillation.
Claim 8
Dependent Claim
95 words
. A process for producing a pitch used as a raw material for carbon fibers, the pitch having a quinoline insoluble content of 7 to 18% by weight and a toluene insoluble content of 70 to 90% by weight, which comprises carrying out thermal modification of a petroleum heavy residual oil having a boiling point of 400°C or more (atmospheric pressure) and a sulfur content of 1.5% by weight or less, separating and removing insoluble substances with heating at a temperature of 380°C or less, and removing a low boiling point fraction by vacuum distillation.
Claim 9
Dependent Claim
33 words
A process for producing a pitch according to Claim 6, wherein the pitch used as a raw material for carbon fibers further contains a n-heptane soluble content of 1.0% by weight or less.
Claim 10
Dependent Claim
29 words
A process for producing a pitch according to Claim 6, wherein the low boiling point fraction is a fraction having a boiling point of 400°C or less (atmospheric pressure).
Claim 11
Dependent Claim
35 words
A process for producing a pitch according to Claim 6, wherein the thermal modification is carried out under such a condition that the yield of the thermally modified oil is 80% by weight or more.
Claim 12
Dependent Claim
39 words
A process for producing a pitch according to Claim 6, wherein the vacuum distillation is carried out under a condition comprising a pressure of 1.0 Torr or less and a liqui-d temperature in the system of 370 to 390°C.
Claim 13
Dependent Claim
55 words
A process for producing a pitch according to Claim 6, wherein a petroleum heavy residual oil having a boiling point of 400°C or more and a sulfur content of 1.5% by weight or less is subjected to thermal modification at a temperature of 380 to 450°C for a heating time of 1 to 30 hours.
Claim 14
Dependent Claim
24 words
A process for producing a pitch according to Claim 6, wherein the petroleum heavy residual oil has a boiling point of 410°C or more.
Claim 15
Dependent Claim
32 words
A process for producing a pitch according to Claim 6, wherein insoluble substances were separated and removed from the thermally modified oil with heating it to a temperature of 350°C or less.
Claim 16
Dependent Claim
56 words
A process for producing a pitch according to Claim 6, wherein the petroleum heavy oil is subjected to thermal modification at a temperature of 410 to 450°C for a time of 1 to 20 hours without applying pressure under such a condition that the yield of the thermally modified oil is 80% by weight or more.
Claim 17
Dependent Claim
40 words
A process for producing a pitch according to Claim 6, wherein the insoluble substances are separated and removed from the thermally modified oil by the action of gravity or centrifugal force with heating to a temperature of 380°C or less.
Claim 18
Dependent Claim
42 words
. A process for producing a pitch according to Claim 6, wherein the insoluble substances are separated and removed from the thermally modified oil at a temperature of 200 to 350°C by utilizing gravity or centrifugal force or by means of filtration.
Claim 19
Dependent Claim
9 words
A process for producing a pitch according to Claim
Claim 20
Dependent Claim
60 words
6, wherein the material from which insoluble substances are removed is subjected to vacuum distillation by a batch vacuum distillation apparatus under a pressure of 1.0 Torr or less at a liquid temperature of the bottom in the system of 370 to 390°C to remove a low boiling point fraction having a boiling point of 750°C or less (atmospheric pressure).
Claim 21
Dependent Claim
60 words
6, wherein the material from which insoluble substances are removed is subjected to vacuum distillation by a batch vacuum distillation apparatus under a pressure of 1.0 Torr or less at a liquid temperature of the bottom in the system of 370 to 390°C to remove a low boiling point fraction having a boiling point of 750°C or less (atmospheric pressure).
Claim 22
Dependent Claim
77 words
A process for producing a pitch according to Claim 6, wherein the material from which insoluble substances are removed is subjected to vacuum distillation by a continuous vacuum distillation apparatus under a pressure of 1.0 Torr or less at a liquid temperature of the flash zone in the system or the bottom in the distillation tower of 370 to 390°C to remove a low boiling point fraction having a boiling point of 750°C or less (atmospheric pressure).
Claim 23
Dependent Claim
68 words
A process for producing a pitch according to Claim 6, wherein the material from which insoluble substances are removed is subjected to vacuum distillation by a batch distillation apparatus under a pressure of 0.5 Torr or less at a liquid temperature of the bottom in the system of 370 to 390°C to remove a low boiling point fraction having a boilling point of 750°C or less (atmospheric pressure).
Claim 24
Dependent Claim
77 words
A process for producing a pitch according to Claim 6, wherein the material from which insoluble substances are removed is subjected to vacuum distillation by a continuous vacuum distillation apparatus under a pressure of 0.5 Torr or less at a liquid temperature of the flash zone in the system or the bottom in the distillation tower of 370 to 390°C to remove a low boiling point fraction having a boiling point of 750°C or less (atmospheric pressure).
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