Thermal Conversion of Mechanically Activated Aspen -Wood in Sub-and Supercritical Ethanol Medium
The thermal conversion of mechanically activated aspen-wood was studied in sub- and supercritical ethanol medium at temperatures of 270 and 350 °C. It was found that the temperature and pressure have a signiﬁ cant inﬂuence on yield and composition of obtained products. Maximum degrees of wood conversion correspond to pressure 20 MPa and they are equal to 76 and 95 wt. % at process temperatures 270 and 350 °C, respectively. It was established that all main components of wood are exposed to thermal conversion at 270 °C. At elevated pressure (20 MPa) the hemicelluloses are depolymerised completely, lignin more than on 70 wt. %, cellulose - on 67 wt. %. At the process temperature 350 °C the total conversion of all wood components to gaseous, liquid and solid carbon products takes place. At this temperature the maximum yield of liquid products dissolved in ethanol corresponds to the pressure 20 MPa.