Delignification and bleaching process and solution for...

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D - Textiles, Paper

21

C

9/2, 8/82

D21C 9/16 (2006.01)

Patent

CA 1129161

Abstract An improved process and solution for delignifying and brightening lignocellulosic pulp. The solution comprises from about 0.1 to about 5% by weight, based on oven-dried pulp of a peroxide and about 0.5 to about 20 mole percent, based on the moles of peroxide, of a metal ion selected from the group consisting of tungsten, molybdenum, chromium, osmium and selenium. The preferred process of this invention com- prises contacting a lignocellulosic pulp with about 0.5 to about 20 mole percent, based on moles of peroxide, of a metal ion selected from the group consisting of tungsten, molybdenum, chromium, osmium and selenium at a temperature below about 50°C; adjusting the pH of the resultant pulp slurry to between about 1 and about 7; adding 0.1 to about 5% by weight based on oven- dried pulp of peroxide and effecting pulp delignification and brightening at about 30°C to about 100°C until most of the peroxide has been consumed.

319915

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