Hydrodesulfidation of the diesel fraction of pyrolytic fuel on polymetallic catalyst

Abstract

Results are presented of a study of the liquid product formed in pyrolysis of automobile tires and fractions of this product. The diesel fraction of the pyrolytic liquid fuel was hydrodesulfided on a polymetallic catalyst. The results of the hydrodesulfidation in a flow-through laboratory installation in the temperature range 320–380°C at a hydrogen delivery rate of 6 L h^–1 are shown. The experiment was performed during 1 h with preliminary activation in a flow of hydrogen for 2 h and raw material delivery rate of 4–16 mL h^–1 on a polymetallic Al–Ni–V–Mo catalyst supported by γ-Al₂O₃. It was found that the degree of purification grows by 14% as the delivery rate is lowered from 16 to 8 mL h^–1, and by 27% upon its decrease to 4 mL h^–1. With temperature varied at the optimal raw material delivery rate of 4 mL h^–1, the degree of purification also changes: the minimum degree of purification is observed at 320°C. The degree of purification grows by 7% as the process temperature is raised by 20°, and by 28% upon its increase by 40°.