Hydrocracking of used luricating oil on Ni-Mo/Al₂O₃ and HZSM-5 catalysts

Abstract

To study hydrocracking process of used lubricating oil on different types of catalyst to investigate the using of used lubricating oil taken from automobile engine. The catalysts were Ni-Mo/AI₂O₃ and HZSM-5 catalyst. The hydrocracking process was performed in a microreacter at initial hydrogen pressure of 0 to 200 psi, reaction temperature range from 400 to 470°C, reaction time range from 30 to 120 minutes for Ni-Mo/AI₂O₃ and 30 to 90 minutes for HZSM-5 catalyst, amount of catalyst range from 0.0% to 5.0% by weight for Ni-Mo/AI₂O₃ and 0.0% to 0.6% by weight for HZSM-5 catalyst. The light oil product was analyzed by Simulated Distillation Gas Chromatography, (DGC). The experimental results showed the optimum conditions of the two catalysts at reaction temperature 450°C, initial hydrogen pressure 100 psi, reaction time 90 minutes for Ni-Mo/AI₂O₃ and 60 minutes for HZSM-5 catalyst, 1.0% by weight of Ni-Mo/AI₂O₃ and 0.5% by weight of HZSM-5. The light oil product yielded in case of using Ni-Mo/AI₂O₃ was 85.64%, the oil compositions were consist of 36.15% of Naphtha, 11.49% of kerosene, 11.21% of light oil, 8.77% of heavy gas oil and 18.02% of long residue. A slightly different results of light oil yielded and composition for two catalysts were observed. The light oil yield in case of using HZSM-5 was 85.46%, whereas oil compositions were consist of 34.87% of naphtha, 11.03% of kerosene, 11.49% of light gas oil, 8.73% of heavy gas oil and 19.34% of long residue.