Ceramics-Silikáty 34, (4) 289 - 298 (1990)

A model system of α - t (conversion - time) data on isothermal course of a heterogeneous reaction was used to derive a procedure for determining the parameters of an equation for a univerasal kinetic model of a polyreactive reactant α = Σ^m_j=1 x_jα_j on the condition that α_j = 1 - exp (-r_jt), where r_j is a parameter expressing the reactivity of a homoreactive fraction whose content in the reactant in question is x_j. The method is based on determining the minimum sums of deviations squared (MSDS) and thus the optimum values of the parameters at gradually increasing number m of the equation terms. Equalization of MSDS is a criterion for the effective value of m. As parameters of the model are then regarded those values which describe adequately the given α - t relationship with the use of the effective number m of homoreactive fractions.