Study on preparation of PAO base oil via catalytic polymerization of alpha-olefin by amide ionic liquid analogues
Ionic liquid analogues catalysts such as AA-AlCl3,NMA-AlCl3 and DMA-AlCl3 are synthesized via one-step method.Raman spectroscopy,ultraviolet-visible spectroscopy,infrared spectroscopy,nuclear magnetic hydrogen spectroscopy,gel chromatography,and high-temperature gas chromatography are employed to characterize and analyze these ionic liquid catalysts and the synthesized polyalpha-olefin(PAO)base oil products over these catalysts.Results show that double-tooth coordinated NMA-AlCl3 has a suitable acidity,over which the optimal conditions for catalytic polymerization are as follows:n(NMA)∶n(AlCl3)=1∶2,the catalyst dosage is 1wt%,the reaction temperature is 120℃,and the reaction time is 60 min.Under these conditions,the yield of PAO base oil prepared is around 87%,the chromaticity is 0,the freezing point is less than-60℃,the viscosity index is 135,the polydispersity index(PDI)is 1.3,and the kinematic viscosity is 4.3 mm2's-1 at 100℃.Compared with the friction properties of commercial PAO4 base oil,it is found that the grinding spot diameter of the prepared PAO is 13%lower than that of commercial PAO4,indicating that it has good anti-wear properties in addition to excellent physical and chemical properties.
ionic liquid analogues1-octenecatalytic polymerizationPAO base oil
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