Abstract: There are provided a detector agent which is effectively discolored at a lower concentration for various halogen compounds and a method for detecting halogen compounds by use of said detector agent. A detector agent for halogen compounds, which contains curcumin or Bromocresol Green as a discoloring component, and said discoloring component is preferably supported on granular activated alumina.

Abstract: An improved scrubbing dust collector and exhaust gas treatment installation are described. The collector (2) includes a tank (21) containing a washing liquid, a scrubbing tower (22) on the upper portion of the tank into which an exhaust gas is introduced, a jetting nozzle (25) on the upper portion of the tower, and at least one netting member (42) located in a lower portion of the tower. The netting may be installed in a frame (40) which has slits therein. A plurality of netting members may be employed and a lower member may have a smaller mesh size than an upper one. The installation includes the scrubbing dust collector (2), a combustor (1) and a separator tower (23). As washing liquid is jetted from the nozzle (25), it passes downward in the scrubbing tower and forms a membrane-like layer on the netting member thereby providing a larger contact area between the exhaust gas and the washing liquid.

Abstract: There are provided a detector agent which is effectively discolored at a lower concentration for various halogen compounds and a method for detecting halogen compounds by use of said detector agent.

Abstract: A decomposition method for effectively decomposing PFC at a low temperature and in safety by use of a chemically and intensively more stable reactant, a reactant for use therein and a decomposition apparatus therefor are provided.

Abstract: The present invention relates to an exhaust gas treatment unit which possesses a stable treating capacity, with a reduced running cost. The exhaust gas treatment unit removes noxious gases such as monosilane contained in an exhaust gas by thermal decomposition. The exhaust gas treatment unit includes a heating drum (5) into which the exhaust gas and oxygen or air are introduced and a heating source (6) disposed on the outer periphery of the heating drum (5) so as to heat the inside of said heating drum (5). A temperature sensor (14) detects the temperature of the inside of said heating drum (5) in the vicinity of its outlet and a controller (16) controls the heating source (6) in accordance with a detected temperature value from the temperature sensor (14) so that the temperature of the inside of said heating drum (5) in the vicinity of the outlet is maintained within a predetermined temperature range.