关键词: 石脑油, 硅改性, ZSM-5分子筛, 择形改质, 汽油

Abstract: A series of catalyst samples were prepared by silylation method, which would be employed as the shape-selective modification catalyst of naphtha. With the application of these catalysts, the n-alkane in the naphtha produced from indirect-coal-liquefaction-process would be converted effciently while the isoparaffin would remain. Thus, the octane value of the processed oil would rise effectively and the yield of gasoline could be maximized. The results of lab-scale experiments showed that when using the unmodified sample as catalyst, the yield of gasoline was 60.51%, and RON was 91.3, but the ratio of isoparaffin/n-alkanes was only 0.78. When the sample modified by loading 5% SiO₂ were used as catalyst, the yield of gasoline increased to 72.68%, and the ratio of isoparaffin/n-alkanes increased to 2.50, while RON decreased slightly to 88.8. The results of pilot experiments showed that when the fuel gas yield was less than 1%, the life time of the catalyst modified by loading 5% SiO₂ was 15 days, and the average yield of gasoline was 62.83% and the average yield of LPG was 33.82%. The results of economic analysis showed that the producer could get 32.74 million RMB profit annually by processing 100000 tons naphtha per year with this technology.

Key words: naphtha, silylation, ZSM-5 zeolite, selective upgrading, gasoline