Pyrolysis is now considered an appropriate technology in dealing with waste problems, such as waste plastics and lubricating oil. An important advantage of pyrolysis is that it produces less air and water pollution. However, pyrolyzed oil includes enough excess unsaturated hydrocarbons to form tar, which can cause the nozzle of engines to plug when pyrolyzed oil is used as fuel. In this study, pyrolysis of waste lubricating oil was carried out to obtain pyrolyzed oil. Then, the formation kinetics and adsorption characteristics of tar have been studied experimentally. A power-law kinetic model was assumed for the mechanism of tar formation. The fastest formation time of tar was 5 days after pyrolysis of waste lubricating oil. An adsorption isotherm experiment was done to select the best adsorbents for 5 days. Activated carbon was proven to have prominent adsorption capability among the other adsorbents that were mainly composed of carbon. The experiment of tar adsorption using activated carbon showed that activated carbon improved the optical intensity of pyrolyzed oil and decreased oxygen compounds in the pyrolyzed oil. The experimental results of elemental analysis supported improvement of pyrolyzed oil quality.
- Waste lubricating oil
ASJC Scopus subject areas
- Analytical Chemistry
- Physical and Theoretical Chemistry