Process for bleaching of lignocellulose-containing pulp

Finland Patent

APP PUB NO FI-111964-B
SERIAL NO

921886

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Abstract

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The present invention relates to a process for delignification and bleaching of chemically digested lignocellulose-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.

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Patent Owner(s)

Patent OwnerAddress
EKA CHEMICALS ABSE445 80 BOHUS

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Inventor(s)

Inventor Name Address
ANDERSSON LENNART KARLAGATAN 7 A 416 61 GOETEBORG
BASTA JIRI SKOGSDUVEVÄGEN 17 PARTILLE
HOLTINGER LILLEMOR HUMLEGAONGEN 19 440 45 NOEDINGE SVERIGE
HOEOEK JAN ELLBO-PARKGATAN 7 463 00 LILLA EDET SVERIGE

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