Method for making isotropic carbon fibers
AssigneeKoppers Company, Inc.
InventorGeorge R. Romovacek
Life of this patent
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Abstract
Isotropic carbon fibers are disclosed and a method is disclosed for making them from liquid hydrocarbon distillates comprising reacting the distillate with elemental oxygen to produce a pitch-like product which will yield isotropic carbon upon subsequent carbonization, forming the pitch-like product into a filament and carbonizing the filament in an inert atmosphere at temperatures in excess of 800.degree. C wherein the distillate is reacted with the oxygen until at least 0.5 standard cubic feet of elemental oxygen is reacted per pound of distillate.
Claims5
A method for preparing isotropic carbon fibers from hydrocarbon distillates selected from coal tar distillates boiling between about 200.degree. to 400.degree. C, straight run petroleum distillates boiling between about 200.degree. to 600.degree. C and catalytically cracked recycle petroleum distillates boiling between about 200.degree. to 500.degree. C comprising:
- a. reacting the distillate with a gas containing elemental oxygen at a temperature of from about 250.degree. to about 420.degree. C until at least 0.5 standard cubic foot of elemental oxygen is reacted per pound of distillate and the distillate is converted to a pitch like substance which yields isotropic carbon upon subsequent carbonization;
- b. forming a fiber from the oxidized hydrocarbon distillate;
- c. carbonizing the fiber in an inert atmosphere at temperatures
- in excess of 800.degree. C.
A method for preparing isotropic carbon fibers from hydrocarbon distillates selected from coal tar distillates boiling between about 200.degree. to 400.degree. C, straight run petroleum distillates boiling between about 200.degree. to 600.degree. C and catalytically cracked recycle petroleum distillates boiling between about 200.degree. to 500.degree. C comprising:
- a. reacting the distillate with a gas containing elemental oxygen at a temperature of from about 250.degree. to about 420.degree. C until at least 0.5 standard cubic foot of elemental oxygen is reacted per pound of distillate and the distillate is converted to a pitch-like substance which yields isotropic carbon upon subsequent carbonization;
- b. distilling the oxidized distillate until it has a cube in air softening point of from about 80.degree. C to about 200.degree. C;
- c. forming a fiber from the oxidized hydrocarbon distillate;
- d. carbonizing the fiber in an inert atmosphere at temperatures in excess of 800.degree. C.
Dependencies are inferred from the claim text.