Kraft pulping is accompanied by a gradual but significant exothermic heat of reaction.Most of the exothermic heat results from the neutralization of carboxyffe acids formed by the degradation of carbohydrates.The 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 per kilogram of wood dissolved for softwood and -148+-28 kcal per kilogram of wood dissolved for hardwood.These results were used in a spreadsheet model to estimate the energy balance and the maximum temperature rise to be expected in batch kraft digesters.
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