METHOD OF ISOMERIZATION OF LUNG PETROL FILLINGS Russian patent published in 2018 - IPC C07C5/22 C07C9/16 

FIELD: chemistry.

SUBSTANCE: invention relates to a process for the isomerization of light gasoline fractions, comprising the preparation of raw materials in the form of straight and secondary gasoline fractions, isomerization of normal paraffins of these fractions in a reactor isomerization unit in the presence of a hydrogen-containing gas, separation of the hydrogen-containing gas from the reaction mixture after the reactor isomerization unit, mixing the obtained isomerizate with the prepared light reformate of secondary gasoline fractions, the subsequent separation of this mixture in a system of distillation columns with successive extraction of fraction C₁-C₄ – from the stabilization column, isopentane – from the column-deisopentanizer, isohexane and heavy fraction C₇ and above – from the column-deisohexanizer and the conclusion of the last two columns in the form of lateral shoulder straps, respectively, of normal pentane and hexane, returned to the reactor block of isomerization. Method is characterized in that in the prepared feedstock entering the reactor block of isomerization, allow the content of benzene up to 5 % by weight due to its involvement in the secondary gasoline fraction hydrogenated in the reactor block of isomerization in the presence of hydrogen-containing gas on the catalyst to cyclohexane with the release of reaction heat compensated by additional heat removal from the reaction mixture by means of a refrigerant, the estimated amount of which is determined by the following relationship: G_XA=G_F·C_B·q_R/(c_XA·(t_R-t_XA)), where G_XA – refrigerant charge, kg/h; G_F – consumption of prepared light reformate of secondary gasoline fractions, kg/h; C_B – concentration of benzene in the prepared light reformate of secondary gasoline fractions, weight fractions; q_R – heat of hydrogenation reaction of benzene, kJ/kg; c_XA – heat capacity of the refrigerant, kJ/(kg·°C); t_R – regulatory temperature in the isomerization reactor, °C; t_XA – the temperature of the refrigerant, °C.

EFFECT: invention makes it possible to increase the yield of isomerate by transferring the isomerization process from adiabatic to quasi-isothermal regime, expansion of raw materials resources through the use of benzene-containing gasoline fractions and an increase in the number of degrees of freedom in the formation of a quasi-isothermal regime.

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