2002 Volume 45 Issue 2 Pages 117-122
Dibenzothiophen (DBT) contents were analyzed quantitatively and qualitatively in straight-run gas oil (LGO, S: 12, 000ppm), deep-hydrodesulfurized gas oil (DGO, S: 147ppm), ultra-deep-hydrodesulfurized gas oil (HDGO, S: 18.5ppm) and catalytically-cracked gas oil (light cycle oil: LCO, S: 2600ppm). The total amount of DBTs in LGO was 4000ppm and gaschromatography of LGO using a sulfur chemiluminescence detector showed ca. 100 peaks of DBTs. The major DBTs in DGO were 4, 6-dimethylDBT, 4-ethyl-6-methylDBT, 1, 4, 6-, 2, 4, 6- and 3, 4, 6-trimethylDBTs, 4, 6-diethylDBT, 1-ethyl-, 2-ethyl- and 3-ethyl-4, 6-dimethylDBTs, and tetramethylDBTs with methyl groups at the 4- and 6-positions. The types and the relative amounts of the DBTs of HDGO were very similar to those of DGO. The total amount of DBTs in LCO was 2000ppm and the composition of DBTs was similar to that of LGO.
