Process for oxygen bleaching

Details Process for oxygen bleaching Process for oxygen bleaching

D - Textiles, Paper

21

C

8/78.1

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

Patent

CA 1337843

A process for oxygen bleaching fibrous cellulose pulp is described in which the pulp passes a first delignification zone with a pre- determined low temperature and a second delignification zone with a predetermined high temperature which is higher than that in the first delignification zone. The pulp is fed through a first verti- cal reactor containing said first delignification zone with low temperature, and thereafter through a second vertical reactor con- taining said second delignification zone with high temperature. The temperature in the first delignification zone is either main- tained at the temperature that the pulp entering for bleaching has acquired during a previous treatment before the oxygen bleaching, or as required is adjusted by the controlled supply of steam to a mixer disposed in the pipe before the first reactor. The tempera- ture in the second delignification zone is adjusted by the con- trolled supply of steam to a mixer disposed in the pipe between the two reactors.

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