PROCESS FOR THE BLEACHING AND DELIGNIFICATION OF CHEMICAL PAPER PULPS AND APPLICATION OF THIS PROCESS TO THE BLEACHING AND DELIGNIFICATION OF KRAFT PULPS AND OF ASAM PULPS

摘要

Process for bleaching and delignifying chemical paper pulp in three stages: a first stage in which the pulp is subjected to gaseous oxygen, followed by two stages in which gaseous ozone and peroxymonosulphuric acid or one of its salts are used in any order.