METHOD OF PRODUCING A SYNTHETIC COMPONENT OF BASES OF HYDRAULIC OILS FOR ROCKET AND SPACE EQUIPMENT Russian patent published in 2019 - IPC C10M105/04 C07C5/10 C10G65/12 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil refining and petrochemistry. Disclosed is a method of producing a component of synthetic hydraulic oils for aviation and aerospace engineering, comprising hydrogenating aromatic hydrocarbon material – ditolylmethane (dimethyl diphenylmethane) in the presence of a catalyst at constant temperature and pressure of hydrogen, recovering the obtained di-(methylcyclohexyl)methane (cycloalkanes) and mixing with low-viscosity low-hardening polyalphaolefins (isoalkanes), wherein hydrogenation reaction is carried out at temperature of 120–180 °C and hydrogen pressure of 1.0–5.0 MPa in a batch reactor while stirring at rate of 600–800 rpm, catalyst used is a nickel skeleton catalyst (Raney nickel) with ratio of catalyst to raw material of 1:10, separation of di- (methylcyclohexyl)methane is carried out at vapor boiling temperature of 270 °C, mixing with polyalphaolefins – at temperature of 60–70 °C for 1 hour.

EFFECT: simplification of the technology (reduction of the number of stages), performance of the process under relatively mild conditions, high output of di-(methylcyclohexyl)methane to 90–95 % due to almost complete de-aromatisation of the hydrogenated material, formation of low amount of by-products, absence of gas emissions and liquid toxic wastes.

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