HIGH-YIELD PRODUCTION STRATEGY FOR HARDWOOD KRAFT PULPS, 2002 Kraft Pulp Yield Anthology

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The Pulp and Paper Industry has seen an increasing trend in the production of low kappa pulps through the early to mid 1990's. This trend has largely been driven by an attempt to reduce or eliminate chlorine chemicals. In the latter case, TCF bleaching sequences require the lowest possible kappa number of the pulp prior to the bleach plant if high brightnesses are to be achieved (1). A major concern with the production of low kappa pulps for TCF and ECF bleaching is an associated yield loss. Loss in yield creates obvious economic consequence for a mill (2,3) and is of particular concern to fibre-short mills in Northern United States and Western Canada. Oxygen delignification of kraft pulps is the most widespread method of producing low kappa pulps. In the case of hardwood pulps, oxygen-stage yields and fully-bleached yields can fall unacceptably, if delignification during cooking or oxygen treatment is too extensive (4,5).