PROCESS FOR TREATING A CELLULOSE-LIGNIN PULP

摘要

A process of treating a cellulose-lignin pulp. In an ozone stage, the pulp i s contacted with ozone to bleach and delignify the pulp. The ozone stage is conducted without the addition of a peroxide bleaching agent. A chelant is introduced into the ozone stage to improve selectivity of the delignificatio n.