Sustainable bleaching of Eucalyptus sp. kraft pulp with hypochlorous acid, ozone and hydrogen peroxide

Eucalyptus sp. is the most important planted crop for production of chemical pulp. This pulp mostly bleached with chlorine dioxide, which produces hypochlorous acid in situ when reacting lignin. However, applying hypochlorus directly not practiced, even though it contributes significantly to bleaching reactions. Therefore, this article presents as main oxygen delignified kraft The results showed that solely decreased kappa number more efficiently than dioxide did, without increasing content adsorbable organic halogens (AOX) effluent. sequence acid, ozone and hydrogen peroxide produced fully pulps, low organically bound (OX) aerobically digestible effluents. pulps digested effluents complied international standards industry. appealing because short, uses mild conditions requires less or similar energy produce chemicals comparable ECF sequences from literature.