Process for bleaching of lignocellulose-containing material

Details Process for bleaching of lignocellulose-containing material Process for bleaching of lignocellulose-containing material

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2102713

Abstract The present invention relates to a process for deligni- fication and bleaching of chemically digested lignocellulose- containing pulp, where the pulp, from which essentially no magnesium ions have been removed by acid wash, is treated with a complexing agent at a pH in the range from 4 up to 9.0 and at a temperature in the range of from 26 up to about 100°C, whereupon the pulp is bleached with ozone. The initial treat- ment with a complexing agent removes the ions of certain metals detrimental to the subsequent ozone bleaching while retaining in the pulp the desirable ions, primarily of alka- line earth metals. Thereby, the selectivity in the deligni- fication is increased. Subsequently, the pulp is bleached with a peroxide-containing compound in an alkaline solution, to obtain the desired final brightness and completely avoid formation and discharge of chlorinated organic compounds.

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