Chlorine-based bleaching process for kraft pulps using...

Details Chlorine-based bleaching process for kraft pulps using... Chlorine-based bleaching process for kraft pulps using...

D - Textiles, Paper

21

C

8/79

D21C 9/14 (2006.01) D21C 9/10 (2006.01)

Patent

CA 1219707

Abstract of the Disclosure Extraction of chlorine bleached kraft wood pulps with aqueous peracids at pH values of 7 or below, aqueous sulfites at pH values below 10 or with certain non-aqueous solvents provides extracted pulps having lower residual color and permits use of lesser quantities of alkali or chlorine dioxide in subsequent bleach steps to attain brightness and strength levels comparable to those attained with pulps treated by alkaline extraction at pH values of 10 or higher. At a comparable level of alkali and chlorine dioxide or hypochlorite application, extraction of chlorinated pulp with peracids provides bleached pulps with enhanced brightness.

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