A new approach for calculation of gasoline octane numbers was described taking into account the reaction interaction of blend components and the interaction mechanism of antiknock additives with hydrocarbons. It was determined that for octane numbers of alkylates and isomerizates, synergistic effect is observed, and for octane numbers of reformates, antagonistic effect is observed. The computer modeling system «Compounding» for calculation of gasoline octane numbers was designed

The main aim of the study is to increase the efficiency of gasoline blending process using developed complex modeling system, it provides counting feedstock changes in the refinery, influencing detonation characteristics of trade gasoline. Final products of modeling system are precise and gasoline blending recipes are economically optimal. The relevance of the study is caused by the need to increase production volumes of trade gasoline in refineries that meet gasoline quality standards. Mathematical modeling and application of automatic computer systems are most relevant solutions for optimization of technologically difficult stages of oil production. The study considers the modeling approach to the blending process from the position of non-additivity of gasoline octane numbers. Practical results: The module of gasoline detonation characteristics developed in Borland "Delphi 7" workspace in conjunction with the module of chromatographic data analysis "Unichrom" and optimal recipes development module are combined in the universal complex system for gasoline blending process maintenance. The system allows taking into account feedstock composition changes on purpose to vary the recipes of trade gasoline blending. The developed complex system analyzes refinery conditions and recommends the feedstock supply in the process and allows getting essential economic benefit for the refineries by reducing the quality reserve of trade products