Abstract: The influence of additives on the product distribution of residue hydrotreating process was studied by adding additives having various functional groups into residue feedstock. Test results showed that the influences of different additives on the hydrotreating reaction performance were mainly embodied on the yields of light oil and resid (>500℃). Adding dodecyl benzene sulfonic acid (DBSA) with acidic functional groups exhibited the best positive effect: the light oil yield and residue conversion increased significantly as compared with base case, coke yield increased slightly; followed by oleic acid. However, adding p-tert-butyl catechol (TBC) with acidic functional groups and fatty amine with basic functional groups showed little positive effect. When adding polysorbate-80 with neutral groups, negative effects, such as higher coke yield, lower light oil yield and less residue conversion were observed. These phenomena should be attributed to the changing of asphaltene existing state in the residue feedstock, the increase of asphaltene solubility and colloid stability by adding additives.

Key words: residue hydrotreating , additive, product distribution, action principle