Abstract
Heats of formation ΔHf°C and absolute entropies S° of coal-derived liquids are essential thermodynamic properties to perform energy and exergy analyses of liquefaction processes of coal. A method to estimate them based on the group-contribution method is proposed. In this method only elemental composition CHxOyNz and the normal boiling point should be given. By applying this new method and the SPEED (Structured Process Energy-Exergy-flow Diagram), the exergy analysis for a coal liquefaction process is performed.
