Bio-oil from rapeseed cake pyrolysis, bio-oil fraction boiling over 120 degrees C and bio-oil blended with light gas oil fraction were submitted to the hydrorefining studies. The usability of NiMo/Al2O3 catalyst for pyrolytic oil hydrorefining was tested at the following parameters: temperature (290-350 degrees 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 degrees 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. (C) 2014 Elsevier B.V. All rights reserved.