Patent ID: 6179971
Filing Date: 2001-01-30
Classification: B01D

Abstract:
A process for purifying a contaminated gas stream by conversion of the contaminants into less harmful products, comprising the steps of:(a) providing a photolytic stage having a source of UV radiation;(b) providing a photocatalytic stage downstream of said photolytic stage, said photocatalytic stage having a photocatalyst and source of UV radiation;(c) passing said contaminated gas stream through said photolytic stage while irradiating said contaminated gas stream with UV radiation so as to convert a portion of said contaminants to partially oxidized species;(d) removing said gas stream with said partially oxidized species of contaminants from said photolytic stage; and(e) passing said gas stream with partially oxidized species of contaminants through said photocatalytic stage by passing said stream over said photocatalyst while irradiating said photocatalyst with UV radiation so as to further convert said partially oxidized species and remaining contaminants to less harmful products.