D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/10 (2006.01) D21B 1/16 (2006.01) D21C 9/16 (2006.01)
Patent
CA 2230315
A pulp refining and bleaching process for increasing the pulp brightness of a mechanical wood pulp prepared from softwood chips wherein the pulp is treated in one or more stages in refiner by adding sodium perborate or peracetic acid generated in a bleach generating unit by reacting sodium perborate or hydrogen peroxide with an activating agent such as tetraacetylethylenediamine in the presence or absence of caustic solution and the pulp discharged from the refiner is subjected to another bleaching stage in a bleach tower by separate addition of sodium perborate or hydrogen peroxide with or without a bleach activator. The process is preferably carried out by passing the pulp through a primary refiner at elevated pressure and optionally to a bleaching tower, a solution of sodium perborate or in-situ generated peracetic acid from a mixture of sodium perborate or hydrogen peroxide and an activator, tetraacetylethylenediamine being fed in the refiner and sodium perborate or hydrogen peroxide with an activator, tetraacetylethylenediamine, being fed in the bleaching tower. The pulp after refining has improved brightness and pulp brightness after an optional tower bleaching has exceeded 75 ISO% points.
Daneault Claude
Leduc Celine
Sain Mohini M.
Daneault Claude
Leduc Celine
Sain Mohini M.
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