GREEN COKE PYROLYSIS - INVESTIGATION OF SIMULTANEOUS CHANGES IN GAS AND SOLID-PHASES

Evolution of volatiles and structural changes in green petroleum coke during its pyrolysis under nitrogen was studied by thermogravimetry in an induction furnace. Four cokes were examined in a particle size of 417-833 mu m between 450 and 1200 degrees C at heating rates of simila r to 40, 90 and 150 K min(-1). The weight loss and hydrogen and methan e concentrations were measured, as well as the apparent and real densi ties, apparent porosities and crystallite sizes of coke samples pyroly sed to various degrees. A model which assumes a limiting-reaction-rate mechanism is used to represent the data.