Method for brightening virgin mechanical pulp

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

2007-01-16

2007-01-16

Hug, Eric (Department: 1731)

Bleaching and dyeing; fluid treatment and chemical modification

Bleaching

C008S110000, C423S515000, C252S188220, C162S007000, C162S083000

Reexamination Certificate

active

10698183

ABSTRACT:
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 bisulfite−moles hydroxide)/moles borohydride is from 0 to 7.8.

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