Process for bleaching of lignocellulose-containing pulp

Details Process for bleaching of lignocellulose-containing pulp Process for bleaching of lignocellulose-containing pulp

D - Textiles, Paper

21

C

D21C 9/16 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2067296

The present invention relates to a process for delig- nification and bleaching of chemically digested ligno- cellulose-containing pulp, wherein the pulp is acid treated at a pH of between about 1 and about 6, whereupon a water- soluble compound containing an alkaline earth metal 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 peroxide compounds, ozone, oxygen and sodium dithionite in an optional sequence or mixture. 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.

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