Paper Pulp Bleaching
Mechanical pulp
Hydrogen Peroxide is the ideal agent for bleaching mechanical and other high yield pulps (thermo-mechanical, chemi-mechanical) to high brightness levels. The brightness is more stable with Hydrogen Peroxide than with any other commercial bleaching agent.
CMP, CSRMP of eucalyptus, CMP bagasse, Cold Soda Semi Chemical Pulp of hardwood and SGW of hardwood can be bleached to high degree of brightness using Hydrogen Peroxide.
Chemical pulp
Recirculation of bleaching effluents therefore becomes possible. Also, when recirculation and burning are not practiced, the use of Hydrogen Peroxide produces a less coloured bleaching effluent which reduces the pollution load on surface waters.
For these reasons and its cost effectiveness, the use of Hydrogen Peroxide has good potential in chemical pulp bleaching as a partial replacement for chlorine, chlorine dioxide and sodium/calcium hypochlorite.
Waste paper pulp
Hydrogen Peroxide is an efficient chemical for both mechanical and chemical pulp bleaching. Hydrogen Peroxide is active in alkaline conditions in which waste papers are usually repulped. Hydrogen Peroxide also aids ink removal. For these reasons Hydrogen Peroxide is a very effective and convenient chemical for waste paper upgrading. Added at the repulping stage, it bleaches the pulp fibres and improves ink removal. Added at the bleach tower, Hydrogen Peroxide bleaching benefits from the higher pulp consistency.