Analysis of delignification dynamics in profiled pulping

Modified kraft pulping has been shown to improve the quality of pulp by inc reasing pulp strength. The implementation of this technology is a reality a nd many mills now practice it. Several issues, however, are still under res earch since its implementation is based on empirical knowledge and cannot b e generalised to all digesters. One of the recommendations to implement mod ified cooking is that of levelling out the effective alkali concentration t hroughout the cook, which demonstrates the subjectivity of the approach. The effectiveness of delignification achieved by liquor profiling is still undergoing an objective evaluation. Mathematical models for these operation s are scarce, and a different set of assumptions and methods are needed for successful delignification modelling. In this work, experimental liquid pr ofiling data from a fully automated laboratory-scale digester are used to a nalyse the delignification kinetics. A different estimation algorithm is ad dressed to find the best dynamic delignification model.