Patent ID: 7799274

Claim:
A device for a thermal decomposition of a volatile compound, and deposition of particles which are formed by said decomposition, comprising: (a) a pressure vessel, (b) at least one reaction tube located inside said pressure vessel such that, an open end of said reaction tube extends into the pressure vessel and an other end of said reaction tube is located outside the pressure vessel and is provided with a gas feed, wherein a longitudinal axis of the reaction tube is oriented in the direction of gravity and parallel to a longitudinal axis of the pressure vessel, wherein the reaction tube can be heated on a gas inlet side and cooled on a gas outlet side, wherein the pressure vessel, in its lower part, comprises a collection cone, wherein the open end of the at least one reaction tube extends into a gas space of the collection cone, wherein the collection cone is connected to an outlet lock for particles, and (c) a gas outlet unit located mainly inside said pressure vessel, said gas outlet unit comprising a gas guide, a gas inlet region, wherein the gas inlet region is in communication with the gas space of the collection cone, a filter system, and a gas outlet, which is located outside the pressure vessel; and wherein said gas outlet unit has a longitudinal axis which is oriented in the direction of gravity and parallel to said longitudinal axis of said pressure vessel; and wherein said reaction tube and said gas outlet unit are located on opposite sides of said longitudinal axis of said pressure vessel.