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 3/02 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1150011

ABSTRACT OF THE DISCLOSURE A method is disclosed for delignification of lingo-cellulose con- taining fiber material comprising mixing an oxygen-containing gas with the cellulose fiber material so as so atomize the gas and form a foam of the gas and the cellulose fiber material, and without an intervening oxidation step, subjecting the foam to upwardly flowing, substantially non-pressurized, alkali extraction. The alkali extraction step is conducted at a temperature of from about 40° to about 80°C. and at a pH, ligno cellulose containing fiber conceutration and oxygen containing gas concentration sufficient to provide a bleached, delignified cellulose fiber without bleaching the lignin substance extracted from the material and to suppress lignin condensation reaction during the extraction.

351280

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