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The purpose of this paper is to illustrate the possibility of using stochastic and fuzzy methods to obtain reduced kinetic models of methanol conversion to olefins. Simulations of the reaction system by Markov chains coupled with the calculus of the informational entropy of the lumped chain are presented. A rough description of the kinetics may be supplied by fuzzy relationships. The fuzzy approach could also engage practical experience in solving the problem. A fuzzy entropy, considered as the measure of loss of information by lumping, was introduced.

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