Patent ID: 6600084
Filing Date: 2003-07-29
Classification: A62D,B01D,B01J,C01B,H01J,H05B,H05H,Y02C,Y02P

Abstract:
A method for decomposing an organic halide; comprising:providing a microwave plasma generator comprising a rectangular waveguide having a hole to transmit a microwave, a cylindrical microwave resonance cavity connected to said rectangular waveguide by communicating with the hole and placed such that a central axis of said resonance cavity aligns with the direction of electric field in said rectangular waveguide, and including a cylindrical outer conductor and a cylindrical probe antenna disposed within the cylindrical outer conductor so as to be coaxial with the outer conductor, a discharge tube which is made of a dielectric material, extends through the hole of said rectangular waveguide, and extends through said resonance cavity so as to be coaxial with the central axis of said cavity, and an ignition member connected with an ignition power supply, wherein said discharge tube has a double-tube structure including outer and inner tubes, a sectional area of an annular gap formed between said outer and inner tubes is constant over an entire length of said inner tube, and an end portion of said inner tube has a gas injection opening having the same diameter as an internal cavity of said inner tube; supplying the organic halide into said inner tube; supplying a gas other than an organic halide, containing water vapor and air into the annular gap formed between said outer and inner tubes; and allowing said ignition member to discharge by operating said ignition power supply, generating a plasma in said outer tube, the plasma extending from the vicinity of the end portion of said inner tube toward an end portion of said outer tube, thereby decomposing the organic halide.