Patent ID: 8222471

Claim:
A process for producing base oil, comprising oligomerizing one or more olefins having a boiling point less than 82° C. (180° F.) in a presence of an ionic liquid catalyst and one or more C8+ alpha olefins in a reactor to produce a base oil having a kinematic viscosity at 100° C. of 36 mm 2 /s or higher and a viscosity index (VI) greater than 55; wherein: a. the ionic liquid catalyst is an alkyl substituted pyridinium chloroaluminate or an alkyl substituted imidazolium chloroaluminate of the general formulas A and B, respectively: where R, R 1 , R 2 , and R 3 are methyl, ethyl, propyl, butyl, pentyl or hexyl, and X is a chloroaluminate; and the one or more olefins having the boiling point less than 82° C. (180° F.) comprise greater than 50 wt % of a total mixture of olefins fed to the reactor.