Gaseous Fuels from Degraded Scrape Rubber and Used Lube Oil

The present investigation deals with the composition and properties of gaseous products of the oxidative cracking process that are applied to fulfill the disposal and utilization of shredded automotive tire scrape and spent lubricating oils mixed at different proportions. Cracking of these mixtures has been performed in an autoclave in an air atmosphere under a pressure of 7 atm, using 0.8 wt% phenols as a catalyst under different conditions of temperatures and time of reaction. The main products of pyrolysis are pyrolytic gases, pyrolytic oils and pyrolytic char. The gases were identified as C 1 , CO 2 , C 2 , C 3 , olefins C 4 , i-C 4 , n-C 4 , olefins C 5 , I-C 5 , n-C 5 , C 6 , and C 7 . Gas chromatography analysis showed that an increase in temperature and time of reaction led to an increase in the light fraction and decreases of the proportion of heavy fraction. The optimum cracking conditions were fulfilled when using oil-rubber ratio 1/0.5, and was, respectively, 0.7 Mpa air pressure, 450°C, and a reaction time of 45 min. The produced gases could be used as a natural gas in heating and as a chemical source based on calorific value and olefins content nature.