Abstract: In order to realize deep desulfurization, nitrogen removal and aromatics saturation, the high and low temperature dual reaction zone RTS（Remove Trace Sulfur）process was developed. The technology can be applied in diesel quality upgrading, LCO hydrogenation to promote polycyclic aromatic saturation, low pressure hydrogenation of jet fuel with high nitrogen content or high final boling point, reforming prehydrogenation of secondary process naphtha. Commercial application results of the process in clean diesel production show that the sulfur content is less than 10 μg/g and the polycyclic aromatic content is less than 5% when hydrotreating diesel feed is mixed with 25% of secondary process diesel fraction, and the product quality can meet the China National VI standard. The operation cycle of the unit can exceed 3 years.

Key words: two reaction zone, RTS technology, distillate oil, hydrodesulfurization, hydrodenitrogenation