High efficiency chlorine dioxide pulp bleaching process

Details High efficiency chlorine dioxide pulp bleaching process High efficiency chlorine dioxide pulp bleaching process

D - Textiles, Paper

21

C

D21C 9/14 (2006.01)

Patent

CA 2069322

HIGH EFFICIENCY CHLORINE DIOXIDE PULP BLEACHING PROCESS ABSTRACT A high-efficiency wood pulp bleaching process to produce wood pulps with higher brightness at equal chlorine dioxide usage or of equal brightness at significantly reduced chlorine dioxide usage. The process comprises reacting the chlorine dioxide with wood pulp at a pH of about 5-10 for about 5-40 minutes and then acidifying the mixture to a pH of about 1.9-4.2. The mixture is then allowed to react for about 2 or more hours to complete the two-step high/low pH bleaching process.

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