Comparison of DIP Bleachinability Between Traditional Soap and Reduced Alkaline Chemistries, 2007 TAPPI 8th Research Forum on Recycling

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Reduced alkaline deinking is of interest to many mills. Reduced alkaline pulper chemistry can supply similar ink contents in the final pulp as can be obtained using traditional alkaline deinking. This study follows the development of brightness and residual ink through a pilot deinking process including a post bleaching stage. These results are obtained for pulps deinked using both traditional alkaline fatty acid chemistry and for pulps using a new reduced alkaline synthetic blend chemistry.

The brightness obtained on flotation accepts for the traditional alkaline fatty acid chemistry, which contained peroxide in the pulping process, was higher than the brightness obtained using the reduced alkaline chemistry which did not have peroxide present in the pulping. Interestingly, the results reveal that following post bleaching the two pulps had the same residual ink and brightness. In other words, the reduced alkali pulp was more responsive to the post bleaching chemicals than was the pulp processed under traditional alkaline deinking conditions.