Aga Aktiebolag

Anna Tigerstr&ouml;m

Anders Tor J&ouml;rgen Engstr&ouml;m

The invention refers to a method for an integrated treatment of cellulose pulp. The method includes the steps: providing said cellulose pulp ( ), providing a determined quantity of white liquor ( ) including alkali and sulphur components, providing an oxygen-containing gas, oxidizing ( ) the sulphur components of the white liquor by the supply of a part of said gas in such a way that at least a part of the sulphur is present in the form of sulphate, transporting the cellulose pulp having a certain kappa number to at least one mixing device ( ), and supplying the oxidized white liquor from the oxidizing step to the cellulose pulp, supplying a part of said gas to the cellulose pulp in said mixing device, mixing the cellulose pulp with the oxidized white liquor and said gas in said mixing device, and transporting the cellulose pulp from said mixing device to a delignification reactor ( ) for oxygen delignification of said cellulose pulp, wherein the kappa number is reduced.

Oxidized white liquor in an oxygen delignification process

A process for the bleaching of lignin present in pulp fibers in an aqueous environment such as a pulp suspension. The invention also relates to a process for producing paper or board from pulp containing bleached lignin. According to the invention carbon dioxide is used for the bleaching of lignin.

Growing community of inventors

Stockholm, Sweden

Anna Tigerström

Growing community of inventors

Stockholm, Sweden

Anna Tigerstr&ouml;m

Anna Tigerström