During the hydroconversion of waste animal fat containing (5- 30%) gas oil (sulphur content: 1.2%, polycyclic aromatic content: 15.1%, total aromatic content: 40.4%) over sulphided NiMo/Al2O3 catalyst, the yields of the gas oil boiling point range main product fraction well approached the theoretical yields at the most favourable process parameters (T: 340 C, p: 50 bar, LHSV: 1.0 h1). For example, in the case of 10% waste lard containing feedstocks, the yield was between 95.1% and 95.5% while the theoretical yield is 96.7–97.0%. During the experiments, the triglyceride part was fully converted, and the sulphur and nitrogen heteroatom removal and aromatic saturation of the gas oil part also occurred with high conversion. The cetane number of the products obtained in the case of 10% waste lard containing gas oil was 56–58 after the hydrogenation, while their CFPP values were about +8 C. After the isomerisation step, which served for the improvement of the cold flow properties, the product yields were 91.4-92.4% on the basis of the triglyceride containing feedstock. The cetane number of the final product was 54-55, while the CFPP value between 15
and 20 C. The sulphur and polycyclic aromatic content of the final products comply with the valid standard EN 590:2013 for diesel gas oils, as well (sulphur content