Abstract: Jet Fuel is prepared from waste cooking oil, which mainly includes two units : hydrogenation treatment and hydrogenation conversion. In order to avoid the poisoning and deactivation of the catalyst in the hydrogenation conversion unit, it is necessary to deeply remove the nitrides in the feedstock to less than 2 μg/g in the hydrogenation treatment unit. In this paper, the effects of different types of hydrogenation catalysts, catalyst grading methods and physical adsorption methods on the removal of nitrogen compounds from waste cooking oil were investigated. The experimental results show that NiMo catalyst has the best effect on the removal of oxygen, sulfur and nitrogen heteroatoms in waste cooking oil. The catalyst grading method can improve the hydrodenitrogenation effect ; the silica gel has a good adsorption effect on impurities in both raw materials and products, which can significantly reduce the nitrogen content.

Key words: waste cooking oil, hydrodenitrogenation, catalyst grading, adsorption denitrification