Abstract:

The influence of ZSM-22 content in isodewaxing catalyst TH-2 on yield and pour point of base oil from hydrocracking bottom oil was studied. The results show that with decrease of the molecular sieve content, the activity of catalyst decreases and the base oil yield increases. When Huizhou unconverted oil(UCO) were used as the feed，the best reaction conditions for TH-2 are 320 ℃, 14.0 MPa, hydrogen to oil ratio of 600:1 and LHSV=1.1 h-1. After 1 000 h running, TH-2 catalyst performance is stable and the pour point of 150N base oil is -18 °C, the total base oil yield is 77.2%.

Key words: hydrocracking tail oil, ZSM-22 molecular sieve, isodewaxing, base oil