Chlorine-free bleaching method for dissolving-grade pulps

Details Chlorine-free bleaching method for dissolving-grade pulps Chlorine-free bleaching method for dissolving-grade pulps

D - Textiles, Paper

21

C

8/78.1

D21C 9/147 (2006.01) D21C 9/10 (2006.01) D21C 9/153 (2006.01)

Patent

CA 2035698

A three-stage bleaching process for dissolving grade pulp utilizes the sequence EOP-Z-P and the off gas from the Z stage is delivered to the EOP stage whose parameters are controlled to fully react all of the oxygen of the off gas. The filtrate or waste water from the Z stage, at a pH below 3, serves to dilute the EOP pulp before Z stage bleaching and/or for de-ashing of the P pulp follow- ing the P stage.

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