The Cost of Improving Pulp Yield, 2012 TAPPI PEERS Conference

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Research efforts have attempted to improve the yield of bleachable grade kraft pulp for several decades. As wood is typically one of the major costs associated with kraft pulping, it is typically assumed that efforts to improve pulp yield or conversely, reduce the amount of wood required to make a specific mass of pulp, is a cost effective, lucrative endeavor. Although this may be true, it is important to understand the impact of increasing pulp yield on the interconnected processes within an integrated pulp and paper mill and to fully evaluate the cost implications of improved pulp yield upon these processes. The current work employs several sets of laboratory pulping conditions and a WinGEMS model of a pulp mill fully integrated with chemical recovery, power, and recausticization, and pulp drying islands to determine where the largest cost impacts associated with improved pulp yield may be experienced.