Method for reducing chlorinated compounds produced during...

Details Method for reducing chlorinated compounds produced during... Method for reducing chlorinated compounds produced during...

D - Textiles, Paper

21

C

8/79

D21C 9/14 (2006.01) D21C 9/10 (2006.01)

Patent

CA 2033077

A chlorination stage bleaching method is disclosed which comprises suppressing formation of polychlorinated dioxins and furans without resulting in cellulose degradation and poor pulp viscosity by controlling the molecular chlorine:hypochlorous acid ratio by adding the chlorine to the pulp in multiple charges and by adding an alkaline material to the pulp during the chlorination stage such that chlorination stage pH is controlled to a value from above about 1.8 to below about 3.5.

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