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Kraft pulping is accompanied by a gradual but significant exothermic heat of reaction. Most of the exothermic heat results from the neutralization of carboxylic acids formed by degradation of carbohydrates. The amount of exothermic heat was measured in a laboratory digester for both softwood and hardwood cooks. The measured values of the heats of reaction at a final H factor of 1200 were -93±31 kcal/kg wood dissolved for softwood and -148±28 kcal/kg wood dissolved for hardwood. These results were used in a spreadsheet model to estimate the energy balance and maximum temperature rise to be expected in batch kraft digesters.
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Determining the Heat of Reaction of Kraft Pulping, 2005 Engineering, Pulping & Environmental Confere