Abstract: A method for producing a preserved flower with its original natural flower color, particularly its original delicate color gradations, retained and a processing solution used in the method are provided. More specifically, the method for producing a preserved flower includes: immersing a fresh flower in a processing solution including a solution or dispersion containing one or two or more selected from a natural oil, natural resin, siloxane, synthetic resin, hydrated urethane, fatty acid ester, and surfactant; and drying the treated fresh flower.

Abstract: A method for producing vapor grown carbon, including mixing a raw material gas containing an organic compound and an organo-transition metallic compound preliminarily heated preferably to a temperature of 100 to 450° C. with a carrier gas heated preferably to a temperature of 700 to 1,600° C., and introducing the resultant gas mixture into a carbon fiber production zone, wherein preferably a mixture of an aromatic compound and acetylene, ethylene, or butadiene is used as an organic compound. The method can include dissolving the transition metallic compound in a solvent, atomizing the resultant solution into fine droplets, evaporating the solvent in the droplets to thereby obtain fine particles of the transition metal compound, and introducing the drifting particles with an organic compound gas into the carbon fiber production zone. Vapor grown carbon fiber is thereby produced.

Abstract: An object of the present invention is to provide a method and apparatus for heat-treating carbon fiber, in which impairment of a furnace caused by solidification of a transition metal impurity serving as a catalyst raw material is prevented, and the amount of the metal, such as Fe, Co, or Ni, contained in the carbon fiber is reduced. In the present invention, a vaporized metal impurity is contained in an inert gas that is passed through a furnace, and the gas is discharged from a high-temperature section of the furnace. The impurity contained in the gas discharged from the furnace is cooled to solidify, and then recovered. The resultant gas is recycled as an inert gas in the furnace.

Abstract: (1) A method for producing vapor grown carbon, comprising mixing a raw material gas containing an organic compound and an organo-transition metallic compound preliminarily heated preferably to a temperature 100 to 145° C. with a carrier gas heated preferably to a temperature 700 to 1,600° C., and introducing the resultant gas mixture into a carbon fiber production zone, wherein preferably a mixture of an aromatic compound and acetylene, ethylene, or butadiene is used as an organic compound; (2) a method in which a transition metallic compound is dissolved in a solvent, the resultant solution is atomized into fine droplets, the solvent in the droplets is evaporated to thereby obtain fine particles of the transition metal compound, the drifting particles are introduced with an organic compound gas into the carbon fiber production zone; (3) an apparatus used in the production methods; and (4) vapor grown carbon fiber thereby produced.

Abstract: 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.

Abstract: The present invention provides 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.

Abstract: 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.

Abstract: An object of the present invention is to provide a method and apparatus for heat-treating carbon fiber, in which impairment of a furnace caused by solidification of a transition metal impurity serving as a catalyst raw material is prevented, and the amount of the metal, such as Fe, Co, or Ni, contained in the carbon fiber is reduced. In the present invention, a vaporized metal impurity is contained in an inert gas that is passed through a furnace, and the gas is discharged from a high-temperature section of the furnace. The impurity contained in the gas discharged from the furnace is cooled to solidify, and then recovered. The resultant gas is recycled as an inert gas in the furnace.