Abstract: The PAO40 crude product was hydrogenated using Pt-Pd/Al2O3 catalyst developed by the Petrochemical Research Institute of PetroChina and the optimal conditions were determined. The results show that under the optimized operating conditions of hydrofining which are 240-280 ℃, 4.0-8.0 MPa, LHSV of 0.1-0.4 h-1 and hydrogen /oil of 300(v/v), the hydrogenated PAO40 has a similar aromatic content with the PAO40 products abroad. No Saybolt color changes of the hydrogenated PAO40 are observed after light test for thirty days, indicating its good light stability.

Key words: poly-α-olefin synthetic oil, hydrofining, Pt-Pd/Al2O3 catalyst, aromatic content