Abstract: Distillation range and carbon distribution of vacuum residue of CNOOC Huizhou refinery were studied by high temperature simulated distillation. The pyrolysis behavior of residual oil and the on-line exhalation characteristics of pyrolysis gas phase products were studied by thermogravimetric and mass spectrometry. The results showed that the initial boiling point and the final boiling point of Huizhou refinery vacuum residue were 319℃and 733℃, respectively, the carbon number distribution was C18 - C120. The TG-MS system can monitor the escaping behavior of vapor volatiles while obtaining the thermogravimetric information. The pyrolysis of residual oil was mainly divided into three stages. The maximum weight loss rate occurred at 455℃, the residual amount was 14% of the feed mass. The main products escaped were H2, CH4, C2H4, C3H6, C3H4, CO2, H2O, H2S, SO2 and light hydrocarbons.

Key words: delayed coking, vacuum residue, High temperature simulated distillation, TG-MS