Abstract: Based on the mechanism of alkane hydroisomerization, by analyzing the properties of hydroisomerization dewaxing catalyst, a molecular sieve named as BCM-168 with special structure and suitable ratio of silica to alumina was synthesized. By controlling the key physical and chemical properties of BCM-168 and optimizing the components of catalyst, catalyst RIW-30 with high isomerization selectivity for lube oil isomerization dewaxing was developed. Theresults of industrial production and preparation repeatability testshowed that the molecular sieve and the catalyst preparation technology had good repeatability. When catalyst RIW-30 was used toprocess hydrocracking unconverted oil, hydrotreated vacuum gas oil and slack wax, the yield of main products was high and the loss of viscosity index was low. It has good activity, hydroisomerization selectivity and raw material adaptability. Compared with catalyst RIW-2, when catalyst RIW-30 was used to process hydrocracking tail oil,the viscosity index loss of the product decreased by 4 and the yield of main product increased by 4-5 percentage points.The results of industrial applications indicated that HVI III base oil could be produced by using catalyst RIW-30 under mild reaction conditions,with high yield of base oil and less loss of viscosity index, which meant that the overall performance of the catalyst RIW-30 was better than that of catalystRIW-2.

Key words: lube, hydroisomerization dewaxing, catalyst, molecular sieve, RIW-30