The maximum possible separation of light fractions from oil at its primary processing plant reduces the load on the main atmospheric column. One of the possibilities for this is the use of a partial distillation column in the process chain, in which water vapor serves as an evaporating agent. For a partial oil refining column, the paper considers the option of using the kerosene fraction of the main atmospheric column or the recycling kerosene fraction from the column itself as an evaporating agent. The research was carried out using the UniSim Design modeling system. The Peng-Robinson method was chosen to calculate the thermodynamic properties of the fraction components. The operation of a typical partial oil distillation column containing 22 plates (0.8 contact device efficiency) is modeled, raw materials are fed to 13 (main quantity) and 18 plates (hot jet). For use as an evaporating agent, the kerosene fraction is selected from the 10 plate of the column itself. In this fractional mixture, the main amount (63% by weight) is The kerosene fraction is occupied, and gasoline (29% by weight) and diesel (8% by weight) are also present. fractions. When calculating a column with different evaporating agents, the achieved content of the gasoline fraction in the distillate was estimated and compared, as well as the change in the temperature profile of the column. At the same time, the temperature in the condenser and the bottom of the column when using the kerosene fraction is about 126 and 207 °C, which is higher than the corresponding temperatures of 92 ° C and 195 ° C when using water vapor. Calculations have shown the possibility of effectively using the kerosene fraction as an evaporating agent, which will eliminate the disadvantages of using water vapor, saving it for other petrochemical processes and unloading the main atmospheric column.

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