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The paper proposes a systematic approach to the development of structured mathematical model and modelling of Chemical-Technological Systems (CTSs) of refinery under fuzzy conditions. Idea and novelty of the proposed method are based on the study of each unit of chemical-technological systems, and based on obtained results, the model of separate element of chemical-technological systems unit is designed. At the next stage, separately-developed models are combined into a single system to fully model the process. The developed method has been successfully implemented during the construction of models system of the basic reforming units of catalytic reforming at Atyrau oil refinery. Comparison of the known results and modelling results based on the proposed method demonstrates the effective realization for constructing a system of models for main units of sulfur production in Atyrau oil refinery.

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