Process for gas phase delignifying wood pulp

Details Process for gas phase delignifying wood pulp Process for gas phase delignifying wood pulp

D - Textiles, Paper

21

C

D21C 3/02 (2006.01) C01B 11/02 (2006.01) D21C 3/04 (2006.01) D21C 9/14 (2006.01)

Patent

CA 2116014

2116014 9304231 PCTABS00020 A process for delignifying wood pulp characterized by admixing an aqueous solution of chloric acid, containing about 30 percent or greater by weight of HClO3, with a non-oxidizable inorganic acid to produce chlorine dioxide gas containing less than 10 percent by volume of chlorine. The wood pulp, having a consistency of 15 percent or greater, is contacted with the chlorine dioxide gas to delignify the wood pulp. The novel process of the present invention reduces the formation of chloroform and significantly reduces the amounts of toxic by-products such as dioxin and other organic chlorides. These undesirable by-products, collectively identified as absorbable organic halides (AOX), require effluents from pulp bleaching processes to undergo expensive treatment methods to eliminate AOX's prior to discharges to sewers. The effluent discharge from the bleaching process of the present invention has less than 2.0 kg adsorbed organic halides (AOX) per ton of wood pulp.

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