D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
8/78.1, 9/16.5
D21C 9/10 (2006.01)
Patent
CA 1175610
ABSTRACT OF THE DISCLOSURE A process is provided for the bleaching delignification of cellulose pulp with oxygen gas in the presence of alkall, 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 subse- quent to washing the pulp with waste liquor obtained from the oxygen gas bleaching delignification stage.
378416
Macrae & Co.
Mo Och Domsjo Aktiebolag
LandOfFree
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