Pyrolysis of coke from delayed coking was performed by thermogravimetric analysis （TGA） in argon and carbon dioxide atmosphere from room temperature to 1 000℃ respectively. The mechanism of pyrolysis was discussed. TGA results showed that during the pyrolysis of coke dehydration happened at 50-100℃ then significant weight loss started from 400℃ and reached a maximum value around 620--640℃, which is commonly attributed to the release of volatile matter due to the rupture of side chains from organic compounds; above 800℃, weight loss increased remarkably, indicating rapid pyrolysis occurred. The average activation energy was determined using a third-order chemical reaction model to simulate the pyrolysis of coke from delayed coking. In the temperature range of 433--904℃, the average activation energy under CO2 and Ar atmosphere was 29.70-44.81 kJ/mol and 57.68-69.44kJ/mol,respectively.
Petroleum Processing and Petrochemicals