Abstract: In order to investigate the reaction characteristics of two typical residue feedstocks in hydrotreating process, the hydrotreating test was conducted in a pilot unit with the same catalyst grading under the same reaction conditions. The results indicate that HDS is easy while HDN and HDCCR are difficult for both feeds; it is difficult to remove S, N and CCR for residues with low sulfur content and high nitrogen content, compared with the feed with high sulfur content and low nitrogen content. The difference in reaction characteristics is related to heteroatom content, component composition as well as molecular structure. The results are in consistent with the results of two commercial VRDS unit operations

Key words: residue hydrotreating, feedstock, HDS, HDN, HDCCR