Chlorine-free process for bleaching lignocellulosic pulp

Details Chlorine-free process for bleaching lignocellulosic pulp Chlorine-free process for bleaching lignocellulosic pulp

D - Textiles, Paper

21

C

D21C 9/153 (2006.01) D21C 9/10 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2099881

2099881 9212289 PCTABS00014 A process for delignifying and bleaching a lignocellulosic pulp without the use of elemental chlorine or chlorine-containing compounds by oxygen delignifying (40) the pulp to a K No. of about 10 or less, a viscosity of greater than about 12 cps and a GEB of about 33-43; and thereafter further delignifying (78) the partially delignified pulp by lifting, displacing and tossing the pulp in a radial direction while advancing it in an axial direction in a plug flow-like manner with an effective amount of ozone (88) for a sufficient time to obtain a substantially delignified pulp having a K No. of about 5 or less, a viscosity of at least about 9-10 cps and a GE brightness of at least about 59. The substantially delignified pulp (102) may then be brightened to a final product having a GE brightness of at least about 75, or alternately up to about 83+ by contacting the ozonated pulp with a sufficient amount of a peroxide compound for a time of up to about three hours, with optional mixing of the pulp/peroxide mixture.

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