异构脱蜡催化剂及工艺条件对润滑油基础油黏度指数的影响

以中国石油大庆炼化分公司轻质低含蜡油和重质高含蜡油为原料,用开发的PIC系列异构脱蜡催化剂,并配套使用某工业加氢预精制和补充精制催化剂,进行加氢预精制-异构脱蜡-补充精制试验,考察加氢预精制过程及异构脱蜡催化剂和工艺条件对润滑油基础油黏度指数的影响。试验结果和工业装置运行数据表明:通过对异构脱蜡催化剂的改进,催化剂中B酸含量增高;B酸含量、加氢精制温度、异构脱蜡温度的升高,均可提高催化剂的开环活性,进而提高产品黏度指数;与上一代异构脱蜡催化剂PIC-802相比,PIC-812催化剂的活性提高,在工业装置上加工大庆650SN糠醛精制油和200SN浅度脱蜡油时,反应温度分别降低2℃和26℃,基础油收率均提高4百分点,黏度指数均提高4个单位。

EFFECT OF HYDROISODEWAXING CATALYST AND REACTION TEMPERATURE ON VISCOSITY INDEX OF BASE OIL

Pre-hydrofined light dewaxed oil (200SN) and heavy furfural refined oil (650SN) from Daqing Refining and Chemical company were used as feedstocks to investigate the effect of new isohydrodewaxing catalyst PIC-812 with improved B acid and operation conditions of pre-hydrofining and hydroisomerization on viscosity index of base oils. The industrial data indicate that the improvement of B acid and the higher reaction temperature of pre-hydrofining and hydroisodewaxing can all increase the ring opening selectivity, resulting in higher viscosity index of base oil. Compared with the previous generation hydroisodewaxing catalyst PIC-802, PIC-812 shows a higher activity. The reaction temperatures of PIC-812 are 2 ℃ and 26 ℃ lower than PIC-802, respectively, with other reaction conditions being the same using PIC-802. Both the base oil yields increase by 4 % and the viscosity index can increase 4 to 9 points.