Method for brightening virgin mechanical pulp

Details Method for brightening virgin mechanical pulp Method for brightening virgin mechanical pulp

D - Textiles, Paper

21

C

D21C 9/10 (2006.01)

Patent

CA 2446490

A method for brightening virgin mechanical pulp. The method comprises combining: (i) an aqueous solution comprising sodium borohydride and sodium hydroxide and (ii) an aqueous solution comprising sodium bisulfite, in a chemical mixer and adding output of the chemical mixer to an aqueous slurry of virgin mechanical pulp. The ratio of (moles bisulfate - moles hydroxide)/moles borohydride is from 0 to 7.8.

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