Method for deep hydrogenation, sulfur removal and aromatics removal of diesel oil

Abstract

The invention discloses a method for deep hydrogenation, sulfur removal and aromatics removal of diesel oil. In the method, two reaction areas are included, wherein diesel oil raw materials and hydrogen gas counter pass the second reaction area, the reaction products out of the second reaction area are charged from the upper part of the first reaction area and in counter current contact with the hydrogen gas from the second reaction area, the obtained gas products are discharged from the top part of the first reaction area, and the liquid products are discharged from the lower part of the first reaction area. In the method, sulfide catalysts in the first reaction area and the second reaction area are not desulfurized, and simultaneously properties such as hydrogenation and sulfur removal of hydrogenation catalysts and aromatics saturation are ensured to be fully shown, so that the service life of the catalyst is prolonged and the production cost is lowered. The method has the advantages of fully utilizing the reaction heat in the second reaction area, saving heat collection or cooling treatment by adding cold medium, saving resources and lowering cost.

Description

technical field [0001] The invention relates to a method for hydrogenation treatment of hydrocarbons, in particular to a method for deep hydrogenation desulfurization and dearomatization of gas, liquid and solid three-phase diesel fractions. Background technique [0002] With the improvement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the production and use of clean vehicle fuels has increasingly become a development trend. As for the cleanliness of diesel oil, desulfurization and dearomatization are the key to cleanliness. [0003] At present, in the desulfurization and dearomatization technologies of diesel oil, hydrotreating technology is still the main and most effective technical means. Hydrogenation treatment technology is also constantly improving, and hydrogenation technologies such as gas-liquid co-current and gas-liquid counter-current have appeared successively. In the deep dearomatization process o...

AI Technical Summary

Problems solved by technology

If a non-precious metal catalyst is used in the second reaction zone, there will be the following disadvantages: since most of the sulfur is removed in the first reaction zone, the sulfur content in the feed to the second reaction zone is very low, and a small amount of H generated 2 The S part will be taken away by the countercurrent hydrogen. In such a low-sulfur environment, the sulfur in the sulfide active phase of the non-noble metal catalyst used in the second reaction zone is easily lost, resulting in a decrease in catalyst activity.

In addition, since hydrodesulfurization and aromatic hydrocarbon saturation are both exothermic reactions in this method, and the temperature requirement of the second reaction zone is lower than that of the first reaction zone, a cold medium must be inserted in the middle for cooling treatment, which will not only increase the production cost , but also wastes thermal resources

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