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The article describes an economic and mathematical multi-criteria model for the interaction of large and small (medium) industrial enterprises in oil refining and petrochemicals. The use of economic and mathematical modeling allows us to develop possible hypotheses in order to obtain additional information about the object of study, which is not available in the implementation of real business processes. Key criteria for optimizing the interaction of enterprises in the oil refining industry are given. Current conditions make it possible to bring priority criteria for optimizing the activities of enterprises in the oil refining industry to certain limit values. These include maximizing profits, minimizing reduced costs and maximizing value added. The constructed model gives a justification of the boundaries of the interests of large and small (medium) industrial enterprises in oil refining and petrochemicals, taking into account the criterion of maximizing profit. As an example, the article considers the interaction of industrial enterprises of various forms of utilization of by-products of oil refining and the development of petrochemical industries. A brief description of the spheres of interests of large and small (medium) industrial enterprises in oil refining and petrochemistry is given.

Modeling the Interaction of Large and Small Industrial Entrepreneurship in Oil Refining