Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With regeneration – reclamation – reuse – recycling or...
Patent
1981-05-27
1983-09-27
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With regeneration, reclamation, reuse, recycling or...
162 65, 162 81, D21C 316, D21C 910
Patent
active
044067356
ABSTRACT:
A process is provided for the bleaching delignification of cellulose pulp with oxygen gas in the presence of alkali, wherein the pulp is first activated with nitrogen dioxide and then washed, preferably with water. The invention is characterized in that the acid solution obtained is used to pretreat the digested pulp subsequent to washing the pulp with waste liquor obtained from the oxygen gas bleaching delignification stage.
REFERENCES:
patent: 4076579 (1978-02-01), Brink
patent: 4087318 (1978-05-01), Samuelson
Alvo Steve
Mo och Domsjo Aktiebolag
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