Oxygen color stripping in secondary fiber recovery

Details Oxygen color stripping in secondary fiber recovery Oxygen color stripping in secondary fiber recovery

D - Textiles, Paper

21

H

D21H 11/14 (2006.01) D21B 1/32 (2006.01) D21C 5/02 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01)

Patent

CA 2068709

Color is removed from secondary pulps with non-chlorine based bleaching agents in treating sequences using oxygen with combinations of peroxide, ozone, and/or hydrosulfite at controlled pH conditions. Acid treatment prior to bleaching steps improves color removal and protects fibers from damage at more severe bleaching conditions.

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