Hydrorefining of oil from rapeseed cake pyrolysis over NiMo/Al2O3 catalyst

Abstract Bio-oil from rapeseed cake pyrolysis, bio-oil fraction boiling over 120 °C and bio-oil blended with light gas oil fraction were submitted to the hydrorefining studies. The usability of NiMo/Al 2 O 3 catalyst for pyrolytic oil hydrorefining was tested at the following parameters: temperature (290–350 °C), LHSV (0.5–2.0 h − 1 ) and 3 MPa hydrogen pressure. The influence of hydrorefining parameters on the physicochemical properties and chemical composition of the obtained products was evaluated. Hydrorefining of raw bio-oil at the temperature of 350 °C, 2.0 h − 1 and 3 MPa of H 2 resulted in unsatisfactory level of refining. Removal of low boiling fraction and LHSV until the value of 0.5 h − 1 was reached allowed to deepen the degree of hydrorefining up to the levels of 71.4% of HDS, 29.0% of HDN and 78.8% of HDO. These hydrorefining products cannot be used as internal combustion engine liquid fuels or as their components. Blending of the bio-oil (20% v/v ) with petroleum-derived oil fraction and subjecting it to a hydrorefining process made it possible to obtain a fuel component of relatively good quality.