Technical Bulletin No. 0619: Delignification and Bleaching of Chemical Pulps with Ozone: A Literature and Patent Review

A review of the literature and patents in the area of ozone bleaching has been presented. The review (a) includes brief descriptions of the published results of ozone bleaching studies for various types of pulps and bleaching sequences, (b) discusses the effects of various process parameters on the properties of bleached pulp, and (c) identifies the various ozone bleaching sequences which have been examined. The ozone bleaching patents issued in the United States, Canada, Japan, Germany, France, and several other countries have been listed and briefly described.