Abstract: The desulfurization of straight-run diesel fuel using a self-made complexing extraction agent (TS-1) was investigated. Under the conditions of an extraction temperature of 20℃, an extraction time of 5 min, a phase separation time of 15 min and a TS-1/diesel volume ratio of 0.02, the sulfur content of treated straight-run diesel A was dropped from 711 μg/g to 245 μg/g, meeting the sulfur content of National Standard for automobile diesel fuel (Ⅲ) (＜350 μg/g), the desulfurization rate was 65.6% and the diesel yield was 99.6%. When the TS-1/diesel volume ratio increased to 0.05, the sulfur content of treated straight-run diesel A was dropped to 42 μg/g, the desulfurization rate was 94.1% and the diesel yield was 99.5%. The removal of sulfide from low sulfur content (374 μg/g) straight-run diesel B and high sulfur content (1 737 μg/g) straight-run diesel C with TS-1 was also studied, and results showed that high desulfurization rate could be obtained under the optimal operation conditions.

Key words: straight-run diesel, complexing extraction agent, complexation, extraction, desulfurization