Modified digestion of paper pulp followed by ozone bleaching

Details Modified digestion of paper pulp followed by ozone bleaching Modified digestion of paper pulp followed by ozone bleaching

D - Textiles, Paper

21

C

D21C 3/24 (2006.01) D21C 3/02 (2006.01) D21C 9/147 (2006.01) D21C 9/153 (2006.01) D21C 9/16 (2006.01)

Patent

CA 2130180

2130180 9316227 PCTABS00025 Kraft pulp (33) is bleached to a brightness of about 90 CPPA or greater, without the use of chlorinated organic compounds that has commercially acceptable strength properties. During production of the kraft pulp it is subjected to extended delignification, by adding kraft white liquor (141) to a first recirculation loop in the digester (45), and/or a second, wash, recirculation loop in the digester (46); or by conventional pulping followed by two oxygen stages (67, 69), with washing between the stages. The extended delignification pulp is then subjected to ozone bleaching (60), with an ozone dosage of less than 1.0 % (preferably less than about 0.5 %). The ozone bleaching sequence may be a (ZE)P(ZE)P sequence (60, 61, 62, 63).

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