Patent ID: 7285250

Claim:
An apparatus for treating perfluorocompound (PFC) gas comprising: a gas washing tower, wherein at least one of water or an aqueous alkaline solution is sprayed to PFC decomposed gas, an exhaust blower for exhausting the gas washed at said gas washing tower, a storage tank, and a mist separating apparatus which separates mist from said gas washed at said washing tower; wherein said mist separating apparatus has a mist removal means comprised of a cyclone type mist separator that removes mist by centrifugal force or a filter type mist separator that removes said mist by filtering, and said mist separating apparatus drains the mist removed by said mist removal means through a lower liquid waste outlet in a form of liquid of a gather of mists, and residual mists not removed by said mist removal means are discharged in a form of liquid of a gather of residual mists through an upper liquid waste outlet provided at an entry end of a rear stage of said mist removal means installed in the emission side of said gas exhausted by said exhaust blower, and wherein each of the said lower liquid waste outlet and said upper liquid waste outlet of said mist separating apparatus has a direct piping connection to said storage tank through which waste water is discharged into said storage tank.