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US 6,602,486 B2Granted
Method for separating and treating exhaust gas of carbon fiber
AssigneeShowa Denko K.K.
InventorsYoshihisa Sakamoto, Nobuhiro Matsumoto, Kunio Nishimura
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AssigneeShowa Denko K.K.
InventorsYoshihisa Sakamoto, Nobuhiro Matsumoto, Kunio Nishimura
Estimating the term…
A method for producing carbon fiber including the following processes: a process for obtaining fine carbon fiber by thermally decomposing an organic compound in a furnace by use of a catalyst; a process for separating a reaction exhaust gas contained in the carbon fiber; a process for continuously subjecting the carbon fiber to thermal treatment in a non-oxidative atmosphere; and a process for incinerating a thermal treatment exhaust gas generated in the thermal treatment and/or the reaction exhaust gas. The method for separating a reaction exhaust gas from carbon fiber is characterized in that a packed carbon fiber layer is formed, an inert gas is caused to flow through the layer, and the layer is compressed. Combustion of the reaction exhaust gas and combustion of the exhaust gas generated from the subsequent thermal treatment is achieved through employment of a pilot burner holding flame at all times in a vertical incinerator.
A method for producing carbon fiber comprising a first step of thermally decomposing an organic compound in a thermal-decomposition furnace at 800-1,300° C. in an atmosphere containing a reducing gas, by use of a transition metal or a compound thereof serving as a catalyst, to thereby obtain carbon fiber, a second step of separating a reaction exhaust gas produced during the first step, wherein the second step includes forming a packed layer of carbon fiber at an outlet side of the thermal-decomposition furnace, causing an inert gas to flow upward from a lower side of the packed layer, and compressing the packed layer, and a third step in which the carbon fiber is subjected to a thermal treatment of firing or graphitization in a non-oxidative atmosphere.
A method for producing carbon fiber comprising a first step of thermally decomposing an organic compound in a thermal-decomposition furnace at 800-1,300° C. in an atmosphere containing a reducing gas, by use of a transition metal or a compound thereof serving as a catalyst, to thereby obtain carbon fiber, a second step of separating a reaction exhaust gas produced during the first step, wherein the second step includes forming a packed layer of carbon fiber at an outlet side of the thermal-decomposition furnace, causing an inert gas to flow upward from a lower side of the packed layer, and compressing the packed layer, a third step in which the carbon fiber is subjected to a thermal treatment of firing or graphitization in a non-oxidative atmosphere, and a fourth step of incinerating a thermal treatment exhaust gas from the thermal treatment step and/or the separated reaction exhaust gas.
Dependencies are inferred from the claim text.