The Preparation Of PAO By Oligomerization Of 1-Decene

Polymerization of 1-decene catalyzed by(C₂H₅)₂AlCl/TiCl₄ to prepare polymer alpha olefins(PAO) and the hydrogenation of PAO were studied in this paper.Oligomerization of 1-decene catalyzed by(C₂H₅)₂AlCl/TiCl₄ to prepare poly-alpha-olefin base oil was studied in part one.Effects of the olefin and solvents on the nature of PAO were discussed.The processing conditions,such as the catalyst mass fraction in reaction system,Al/Ti molar ratio,reaction time and reaction temperature,were investigated.The results show that the(C₂H₅)₂AlCl/TiCl₄ catalyst exhibits high activity in oligomerization of 1-decene.Branch ratio of PAO was increased with increasing solvent polarity.Therefore,lower viscosity index PAO was obtained.Dynamic viscosity of PAO at 100℃was dramatically increased with increasing the Al/Ti mole ratio of the (C₂H₅)₂AlCl/TiCl₄ catalyst.In other words,a variety viscosity of PAO can be prepared by adjusting the Al/Ti mole ratio of the(C₂H₅)₂AlCl/TiCl₄ catalyst.Under a optimal reaction conditions:reaction temperature 80℃,reaction time 4h and the catalyst mass fraction in reaction system 4.0%,yield of PAO is 75.6%and the viscosity index is as high as 173.Hydrofining of the PAO was carried out in the presence of Pd type catalysts in part two. The influences of the reaction temperature,reaction pressure,hydrogen to oil volume ratio and liquid space velocity on the hydrogenation reaction were studied by Supported Pd-catalyst.The suitable processing conditions were obtained as follows:reaction temperature is 240～260℃,reaction pressure is 3.0～4.0 MPa,hydrogen to oil volume ratio is 500:1 and liquid space velocity is 0.5～1.0 h^-1.Stability test is necessary to noble metal catalyst.The results showed that bromine value,pour point,viscosity,viscosity index,and liquid yield of PAO had a good stability on constant temperature.It shows that the catalyst had a good stability to hydrofining of the PAO.The results provided theoretical foundation for the preparation of Lubricant base oil by oligomerization of 1-Decene,and also provided the basis for industrial production of PAO.