Hydrotreatment of pyrolysis oil from waste tire in tetralin for production of high-quality hydrocarbon rich fuel

摘要

Pyrolysis is a green method for waste tires processing with aim to produce oil. However, the resulting oil contains a relatively large amount of sulfur and nitrogen compounds, limiting its direct use. Therefore, this study aimed to improve properties of the waste tire pyrolysis oil (TPO) particular to reduce the N and S contents. The combination of tetralin and H-2 was employed to provide hydrogen source to enhance the hydrotreatment of the TPO. Effects of catalyst type (AC, Ir/C, Pt/C, Ru/C, and Pd/C), temperature (350-450 degrees C), catalyst loading (1-20 wt %), time (0.5-4 h), and hydrogen pressure (1 atm-9 MPa) on the upgraded products distribution and properties of the upgraded oil (UO) were examined. Positive synergetic effect between tetralin and H-2 existed in favoring the reduction of gas and solid products and improving the quality of the UO. Tetralin played a very important role in transferring molecular hydrogen to activated hydrogen and favored the hydrogenation reactions. Among the noble metals examined, Pt/C presented the highest performance toward the N, O, and S removal. The lowest N (0.09 wt%) and S (15 ppm) contents of UO were obtained at 430 degrees C, 2 h, 3gTPO + 3gTHN, 15 wt% Pt/C, and 6 MPa H-2. The UO had higher-heating values ranging from 42.42 to 44.63 MJ/kg depending on the reaction conditions. The chemical components of the UO are mainly aromatic compounds. Especially, monocyclic aromatic hydrocarbons account for about 40% of the total content.