▎ 摘　　要

NOVELTY - Reaction pipe, cyclone, and a collection portion are pumped in conduction thermal plasma device to generate flow of gas flowing, and plasma is produced in conduction coil section. Quenched gas is injected from upper side of reaction pipe toward end portion of domain. Hydrocarbon gas is injected toward reaction pipe side from plasma torch and domain is passed. Graphene is produced as hydrocarbon gas, and heat-decomposed. The produced graphene is cooled in reaction pipe by quenched gas and collected on lower portion of reaction pipe, cyclone, or collection portion. USE - Production of graphene (claimed). ADVANTAGE - The graphene is efficiently produced with high purity, by a simple process. DETAILED DESCRIPTION - Reaction pipe, cyclone, and a collection portion are pumped in a conduction thermal plasma device to generate flow of gas flowing, and plasma is produced in a conduction coil section applied with an induced electromotive force from a high frequency power supply by spraying a plasma source gas from a plasma torch to a reaction pipe side. The quenched gas is injected from the upper side of reaction pipe toward the end portion of the domain in which the plasma is formed. The hydrocarbon gas is injected as a starting raw material toward the reaction pipe side from the plasma torch and a domain is passed in which the plasma is formed. The graphene is produced as hydrocarbon gas passed through the domain where the plasma is formed, and heat-decomposed. The produced graphene is rapidly cooled in the reaction pipe by the quenched gas, and rapidly cooled graphene is collected on the lower portion of reaction pipe, lower portion of cyclone, or lower portion of collection portion.