Abstract: Through analysis, it was found that the main factor affecting the ultra-deep desulfurization of liquid phase diesel hydrogenation technology was the hydrogen sulfide,a by-product dissolved in the oil. The dissolution law and distribution of hydrogen sulfide in diesel oil were simulated by real oil products, it was found that adding a small amount of hydrogen was effective for ultra-deep desulfurization in liquid phase technology. A continuous liquid phase diesel hydrotreating technology by dual reactor zone (SLHTDr) was developed. The results of the medium scale test showed that the inhibition of hydrogen sulfide on the deep desulfurization could be overcome by adding hydrogen in the second reaction zone according to the volume ratio of hydrogen and oil of 30-50. The diesel oil with sulfur mass fraction less than 10 μg/g could be obtained under mild process conditions (a reaction temperature of 305℃, a volume space velocity of 6.0h^-1). The industrial application results of SLHTDr showed that the energy consumption of the unit was 11.9% lower than that of the same kind technologies,thelow energy consumption production was realized,and the carbon emissions of the production process was reduced. It provides technical support for further upgrading of diesel quality and reducing carbon emissions in the future.

Key words: diesel, liquid-phase hydrogenation, hydrogen sulfide, energy consumption, carbon emission