Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

Details Ozone treatment of chlorine dioxide/chlorine chlorinated pulp Ozone treatment of chlorine dioxide/chlorine chlorinated pulp

D - Textiles, Paper

21

C

9/59, 8/80

D21C 9/153 (2006.01) D21H 11/16 (2006.01)

Patent

CA 2017334

The present invention provides for improvements in the preparation of cellulosic wood pulp for use in papermaking, and specifically to enhancement of the quality of a pulp which has been subjected to a chlorine-based bleaching agent, by subjecting the chlorinated pulp to ozonation prior to an extraction stage in the bleaching sequence. The improved pulp of the present invention includes reduction of total organically bound chlorine residues in the wood pulp and adsorbed organic halides (AOX) in the effluent, and has good brightness and viscosity. The advantages of the present invention may be accomplished by means of a bleaching sequence that employs as few as four stages, namely DZED with attendant relatively lower capital investment than heretofore possible.

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