PETROLEUM BASE OIL PRODUCTION PROCESS Russian patent published in 2007 - IPC C10G65/12 

FIELD: petroleum processing.

SUBSTANCE: invention, in particular, relates to development and improvement of the processes of hydrofining and catalytic dewaxing of petroleum oil components. Petroleum base oil production process is discloses wherein hydrofining and catalytic dewaxing of hydrocarbon stock is carried out via bringing the latter into contact with catalytic system at elevated temperature and pressure in presence of hydrogen, said catalytic system consisting of hydrofining catalyst, containing active alumina-supported nickel and molybdenum, and dewaxing catalyst containing middle-silica zeolite. Specifically, process is conducted at 330-370°C, pressure 24.0-26.0 MPa, volumetric feed supply velocity 0.2-1.5 h-1, hydrogen-containing gas-to-feed ratio 1000-1500 nm3/m3. Catalytic system contains, summarily at least 20% nickel and molybdenum on active alumina and consists of alternating beds of hydrofining catalyst (70-55%) and dewaxing catalyst, which contains up to 60% middle-silica zeolite.

EFFECT: increased yield of desired fraction, reduced freezing temperature, and improved viscosity characteristics at low-temperature dearomatization of base oil.

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