Condensate Chemistry in NSSC Evaporators, 2007 Engineering, Pulping & Environmental Conference

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Novel sampling and testing techniques were developed and employed by a mill team to determine the composition of black liquor evaporator vapors and condensates in a large, integrated neutral-sulfite semi-chemical (NSSC) mill. The original purpose of the study was to determine the source and chemistry of the evaporator set’s high NCG loading and how to mitigate problems associated with this high loading. The focus shifted to a study of the condensate acidity and its effects on pulp cooking conditions and costs, with the goal of developing a capital project to minimize condensate acidity, thereby reducing mill chemical costs.