JP2007191840A5 - - Google Patents

Claims (15)

A method for producing a vapor-grown carbon fiber, comprising producing a carbon fiber in a gas phase by introducing a raw material containing at least a carbon source and a catalyst and / or a catalyst precursor compound into a heating zone,
The method for producing vapor grown carbon fiber, wherein the raw material further contains an oxygen-containing carbon source compound selected from the group consisting of ketones and ethers.   The catalyst and / or catalyst precursor compound is solid or liquid at normal temperature and normal pressure, the oxygen-containing carbon raw compound is liquid at normal temperature and normal pressure, and the catalyst and / or catalyst precursor compound The method for producing vapor-grown carbon fiber according to claim 1, wherein the carbon-containing compound is dissolved or suspended in the oxygen-containing carbon source compound and introduced into the heating zone.   The gas phase according to claim 2, wherein the oxygen-containing carbon source compound in which the catalyst and / or catalyst precursor compound is dissolved or suspended is vaporized in advance and then introduced into the heating zone. A method for producing carbon fiber.   The method for producing vapor-grown carbon fiber according to any one of claims 1 to 3, wherein the oxygen-containing carbon source compound has a boiling point at normal pressure of 80 ° C or higher. The method for producing vapor grown carbon fiber according to any one of claims 1 to 4 , wherein the carbon source contains at least methane. The vapor grown carbon fiber according to any one of claims 1 to 5, wherein a concentration of the methane in the raw material is 15 mol% or more and less than 100 mol%, and a temperature of a high temperature portion of the heating zone is 1100 ° C to 1500 ° C. Manufacturing method. The method for producing vapor grown carbon fiber according to any one of claims 1 to 6, wherein the temperature of the introduction part of the heating zone is 700 ° C or lower. 8. The vapor grown carbon according to claim 1, wherein the vapor grown carbon stays in the low temperature portion of the heating zone at a temperature of 600 ° C. to 1000 ° C. for 0.05 second or more before reaching the high temperature portion of the heating zone. A method for producing fibers. The method for producing vapor grown carbon fiber according to any one of claims 1 to 8 , wherein a residence time at a temperature of 1100 ° C or higher is 0.001 second or longer in the heating zone. The total amount of carbon atoms contained in the carbon source other than methane in the feed is 60% or less of the total amount of carbon atoms contained in methane, the vapor-grown carbon fiber as described in any one of claims 1 to 9 Production method. The ratio of the number of atoms of the catalyst element in the raw material to the number of all carbon atoms in the raw material
(Number of atoms of catalyst element) / (Number of all carbon atoms)
= 0.000005 to 0.0015
The method for producing vapor grown carbon fiber according to claim 1, wherein The method for producing vapor grown carbon fiber according to any one of claims 1 to 11 , wherein all or part of the gas after the reaction is circulated and reused. The manufacturing method of the vapor grown carbon fiber in any one of Claims 1-12 which manufactures the carbon fiber whose average fiber diameter is 10 nm or more. A vapor grown carbon fiber produced by the method for producing a vapor grown carbon fiber according to any one of claims 1 to 13 . The vapor grown carbon fiber according to claim 14 , wherein the average fiber length is 10 µm or more.