Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – Gas – vapor or mist contact
Patent
1992-06-25
2000-11-28
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
Gas, vapor or mist contact
162 78, 162 89, D21C 914, D21C 9153
Patent
active
061530514
ABSTRACT:
A method for improving the preparation of chemical cellulosic wood pulp for use in papermaking, and specifically to enhancement of the quality of a kraft pulp which has been subjected to a chlorine dioxide/chlorine bleaching stage and thereafter subjected to ozonation prior to an extraction stage in the bleaching sequence. The improved pulp of the present invention exhibits reduced 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 a minimum of stages, namely (D.fwdarw.C)ZED or D.sub.c ZED with attendant relatively lower capital investment than heretofore possible.
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Berry et al, "Toward Preventing The Formation of Dioxins During Chemical Pulp Bleaching," Pulp & Paper Canada, p 48-58, Aug. 1989.
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Alvo Steve
International Paper Company
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