D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 1/04 (2006.01) D21C 9/02 (2006.01) D21C 9/10 (2006.01)
Patent
CA 2537033
A single pulp bleaching stage comprises an acid treatment, A, a neutralization treatment, n, and a chlorine dioxide treatment, Do. The AnD o bleaching stage may optionally include washing between treatments, either between each treatment or only some treatments, represented by A-n-D o which indicates there is washing between the acid (A) and the neutralization (n) treatments and the neutralization (n) and the chlorine dioxide (D) treatments, or An-D o which indicates there is washing only between the neutralization (n) and the chlorine dioxide (D) treatments. The AnD o stage can be followed by washing and further bleaching stages. Preferably, the (AnD o) stage is followed by an extraction stage E op with caustic in the presence of oxygen and a peroxide.
O'leary Pamela J.
Pikka Olavi
Shin Nam Hee
Andritz Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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