Method at bleaching ligno-cellulose containing material

Details Method at bleaching ligno-cellulose containing material Method at bleaching ligno-cellulose containing material

D - Textiles, Paper

21

C

8/78.1, 9/16.5

D21C 9/10 (2006.01)

Patent

CA 1235257

ABSTRACT OF THE DISCLOSURE Ligno-cellulose containing fiber material is delignified during alkali extraction using oxygen containing gas. The fiber material is first bleached, with chlorine, chlorine dioxide or a mixture thereof, then mixed at a pulp concentration at 10 to 18% with the oxygen containing gas in an intensive mixer arranged immediately before an inlet to a substantially non-pressurized upward flowing extraction tower to provide a stable foam of the pulp suspension having the gas dispersed therein. The foam suspension is passed to the extraction tower and is extracted for a relatively short period of time (i.e., less than about 90 minutes) and at a relatively low temperature (i.e., 50 to 70°C) at a final pH in the pulp suspension of over 9. The method is advantageous since a conventional bleaching plant can be used only with an additional mixer and product of the same quality as that of oxygen bleaching can be obtained without heating oxidant.

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