METHOD OF PRODUCING POLY-ALPHA-OLEFINS Russian patent published in 2013 - IPC C08F10/14 C08F6/10 

FIELD: chemistry.

SUBSTANCE: invention relates to a method of producing a liquid poly-alpha-olefin. The method involves polymerisation in a reaction vessel of a C₈-C₁₂ α-olefin in the presence of a saturated C₈-C₁₂ hydrocarbon, hydrogen and a catalyst system to obtain an initial product of crude liquid poly-alpha-olefin. The C₈-C₁₂ hydrocarbon is fed into the reaction vessel in amount of 5-70 wt %. A stream rich in saturated hydrocarbon is then separated from the removed product of crude liquid poly-alpha-olefin. 5-35 wt % of the stream rich in hydrocarbon is removed from the polymerisation system in form of a blow-off stream to prevent accumulation of by-products and contamination. Saturated C₈-C₁₂ hydrocarbons are held in the reaction vessel with content of 8-40 wt % with respect to the combined weight of the C₈-C₁₂ alpha-olefin, saturated C₈-C₁₂ hydrocarbon and poly-alpha-olefin contained in the reaction vessel.

EFFECT: obtaining poly-alpha-olefins with desirable lubricant viscosity with high conversion, selectivity and output.

14 cl, 8 dwg, 7 tbl, 9 ex