Abstract: By analyzing the key factors influencing ultra-deep desulfurization of diesel fuel, a process for ultra-deep hydrodesulfurization of diesel (RTS) was developed. Studies on the process of RTS technology for producing ultra-low sulfur diesel fuels were carried out on a pilot plant unit. Results showed that by optimizing process flow and operation conditions, using feedstocks mainly containing high sulfur straight-run diesel, ultra-low sulfur diesel fuels with sulfur contents less than 50 μg/g and 10 μg/g could be obtained under high space velocity (50% higher than that of conventional hydroprocessing). Stability test results showed that RTS technology could well meet the needs of long-term operation in industrial unit.

Key words: ultra low sulfur diesel fuel, hydrodesulfurization, pilot plant test, technology