D - Textiles – Paper – 21 – C
Patent
D - Textiles, Paper
21
C
D21C 9/14 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01) D21C 3/22 (2006.01) D21C 9/147 (2006.01) D21C 9/16 (2006.01)
Patent
CA 2327248
An environmentally friendly (ECF), yet commercially viable, process produces fully bleached (typically having a brightness of over 89 or 90% ISO) cellulose pulp using a (ZEND) treatment. Typically pulp is produced in an essentially sulphur-free pulping process (such as an soda/AQ process), and is then treated by a D-EO-, D-EP-, or D-EOP- sequence before the (ZEND) treatment. Optional oxygen delignification may also be used, and subsequent elemental-chlorine-free bleaching sequences may also be employed, although normally not necessary since the pulp after the (ZEND) treatment has high brightness and good viscosity (e.g. over 21 cP).
Andritz Inc.
Andritz-Ahlstrom Inc.
Bereskin & Parr Llp/s.e.n.c.r.l.,s.r.l.
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