Abstract: CNOOC Oil & Gas (Taizhou) Petrochemical Co.,Ltd. used the vacuum fraction of South China Sea crude oil as feedstock and the existing base oil production unit, and adopted a full hydrogenation process, two kinds of high quality API III base oils, TZ-HVI 6 and TZ-HVI 4, were produced by adjusting the properties of raw oil and optimizing process parameters. The results of product property analysis showed that API Ⅲ base oil produced by Taizhou Petrochemical Company had high viscosity index, high content of saturated hydrocarbon, low content of sulfur, low pour point and excellent dynamic viscosity at low temperature, the related property parameters were similar to the same kind mainstream imported products, and some performance indexes were even better than YUBASE series base oils produced by SK Company. Furthermore, SP 5W-30 gasoline engine oil was produced by using API III group base oil TZ-HVI 6 and TZ-HVI 4 produced by Taizhou Petrochemical Company, its key physical and chemical indexes, such as foam resistance, sulfur content, phosphorus content, high temperature and high shear viscosity, evaporation loss and sulfate ash content, could meet ACEA C3 standard.

Key words: South China Sea crude oil, hydrogenation, lube base oil, process parameter