Process for bleaching mechanical wood pulp

Details Process for bleaching mechanical wood pulp Process for bleaching mechanical wood pulp

D - Textiles, Paper

21

C

8/81

D21C 9/10 (2006.01) D21B 1/16 (2006.01)

Patent

CA 1325868

ABSTRACT OF THE DISCLOSURE A paper pulp refining and bleaching process wherein the pulp is treated in one or more refiners with a sodium hydrosulfite bleach liquor in the presence of a strong alkali such as NaOH, whereby the bleaching solution has an alkaline pH, preferably 10 to 12 and the pulp is discharged from the refiner at a pH of from about 5 to 6. The bleaching produces a brightness gain of at least 8 to 13 ISO points in the refiners. The process is preferably carried out by passing the pulp successively through a primary refiner at elevated pressure, a secondary refiner at atmospheric pressure and a bleaching tower, an alkaline hydrosulfite solution being fed to each.

593749

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