MODIFIED POLYSULPHIDE (AQ)-PULPING OF SOFTWOOD, 2002 Kraft Pulp Yield Anthology

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A review of the polysulphide (PS) liquor generation methods has been made. By preparing some PS liquors which simulate future possibilities, pilot scale PS-(AQ) pulping studies were conducted. The studies were carried out in a recently acquired pilot plant which can simulate both conventional cooking techniques as well as the latest pulping developments. Two types of pulps were made, type 1 were liner board grade pulps and type 2 were bleachable grade pulps. Type 1 pulps were made by using up to 20% green PS-liquor in conventional PS-AQ pulping. Type 2 pulps were made by adding all PS in the impregnation stage of iso-thermal cooking simulated cooks and applying either NaOH (Soda liquor) or kraft liquor (WL) as the major alkali source.