Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1992-09-14
1994-10-04
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 3011, 162 34, 162 38, 162 60, 162 65, 162 78, 162 89, D21C 1104, D21C 1110
Patent
active
053523326
ABSTRACT:
A process for bleaching wood pulp is provided comprising subjecting the wood pulp, after brown stock washing, to an oxygen delignification stage, a washing sequence, a first chlorine dioxide bleaching stage, an oxidative extraction stage, at least one final chlorine dioxide bleaching stage and then recycling the filtrate from the oxidative extraction stage countercurrently through the bleaching plant and brown stock washing. Additionally, and quite beneficially, the filtrate from the first chlorine dioxide bleaching stage is also recycled countercurrently through the brown stock washing thereby significantly reducing the environmental impact associated with the manufacture of bleach wood pulp.
REFERENCES:
patent: 3698995 (1972-10-01), Rapson
patent: 4039372 (1977-08-01), Reeve et al.
patent: 4042452 (1977-08-01), Arhippainen et al.
Ambady Raman
Maples Gerald E.
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