An industrial system for the production of white liquor of a pulp and paper industry, Klabin Paraná Papéis, formed
by ten reactors was modeled, simulated, and analyzed. The developed model considered possible water losses by the
evaporation and reaction, in addition to variations in the volumetric flow of lime mud across the reactors due to the
composition variations. The model predictions agreed well with the process measurements at the plant and the
results showed that the slaking reaction was nearly complete at the third causticizing reactor, while causticizing
ends by the seventh reactor. Water loss due to slaking reaction and evaporation occurred more pronouncedly in the
slaker reactor than in the final causticizing reactors; nevertheless, the lime mud flow remained nearly constant
across the reactors.
