D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/16 (2006.01) D21C 3/04 (2006.01) D21C 9/147 (2006.01)
Patent
CA 2139246
Abstract The present invention relates to a process for delig- nification and bleaching of chemically digested lignocellulo- se-containing pulp, wherein the pulp is acid treated at a pH of between about 1 and about 6, whereupon a water-soluble mixture of a magnesium compound and a calcium compound is added at a pH of between about 1 and about 7 before the pulp is treated with a chlorine-free bleaching agent. The chlorine- free bleaching agent includes hydrogen peroxide. After the treatment according to the invention, the pulp may be finally bleached to the desired brightness, suitably with a chlorine- free bleaching agent, such as ozone, to completely avoid formation and discharge of AOX.
Andersson Lennart
Basta Jiri
Holtinger Lillemor
Hook Jan
Andersson Lennart
Basta Jiri
Eka Nobel Ab
Holtinger Lillemor
Hook Jan
LandOfFree
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