Patent ID: 6051197
Filing Date: 2000-04-18
Classification: B01D

Abstract:
A method for treating a waste gas, comprising the steps of:heating the waste gas in the presence of air to generate a particulate polymer and a refined gas;separating and collecting separately one portion of the generated polymer and the refined gas including the remaining portion of the polymer generated in said heated waste gas; andcollecting said remaining polymer from said refined gas by applying centrifugal forces having different magnitude continuously to the refined gas including the remaining polymer which is separated in said separating-and-collecting step,said step of applying centrifugal forces having different magnitude comprises providing a plurality of at least three cyclone separators connected in series and having decreasing diameters respectively applying progressively greater centrifugal forces to the refined gas including the remaining polymer after separating one portion of the generated polymer, whereby particles which are not removed by the centrifugal force in one of said serially connected cyclone separators is subjected to a higher centrifugal force in the succeeding one of said at least three serially-connected cyclone separator.