The experiments discussed in this thesis have been performed in the Department of Chemical Engineering, Process & Systems Engineering Laboratory, at Åbo Akademi University in Turku. Supercritical Water Gasification of glycerol has been carried out on a laboratory scale at 600 °C and 250 bar, by setting three levels of feed concentration (2.5, 5 and 10%) and three levels of volume flow rate of nitrogen (125, 250 and 375 ml/min). The latter, which is inversely proportional to the residence time, is used to push the biomass solution into the reactor. The choice of these parameters was a consequence of the previous experiments made in the same laboratory and of a careful bibliographic survey.