ISSN 0862-5468 (Print), ISSN 1804-5847 (online) 

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


A METHOD FOR EVALUATING THE PARAMETERS OF A UNIVERSAL KINETIC MODEL OF A POLYREACTIVE REACTANT FROM DATA ON ISOTHERMAL COURSE OF A HETEROGENEOUS REACTION
 
Kovár Vladimír, Bachan Jozef
 
Faculty of Chemical Technology of the Slovak Technical University, Department of Chemical Technology of Silicates, Radlinského 9, 812 37 Bratislava

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 = Σmj=1 xjαj on the condition that αj = 1 - exp (-rjt), where rj is a parameter expressing the reactivity of a homoreactive fraction whose content in the reactant in question is xj. 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.


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