0402335-A2 is referenced by 27 patents and cites 3 patents.

The invention relates to a process for bleaching chemically delignified lignocellulose-containing pulp, to render more efficient a peroxide-containing treatment stage, by treating the pulp with a complexing agent before the peroxide step, so that the trace metal profile of the pulp is altered by the treatment with the complexing agent, in the absence of sulphite, at a pH in the range from 3.1 up to 9.0 and at a temperature in the range from 10 DEG C up to 100 DEG C, whereupon, in a subsequent step, the treatment with a peroxide-containing substance is carried out at a pH in the range from 7 up to 13, said two-step treatment being carried out at an optional position in the bleaching sequence applied to the pulp.

Title
Process for bleaching lignocellulose-containing pulps.
Application Number
EP19900850200 19900521
Publication Number
0402335 (A2)
Application Date
May 21, 1990
Publication Date
December 12, 1990
Inventor
Samuelsson Marie R
SE
Basta Jiri J
SE
Holtinger Lillemor K
SE
Lundgren Per G
SE
Assignee
Eka Nobel
SE
IPC
D21C 09/16
D21C 09/147
D21C 09/10
D21C 09/16
D21C 09/147
D21C 09/10
D21C 09/16
D21C 09/147
D21C 09/10
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