Hydrocracking method for processing low-sulfur raw material

Abstract

The invention discloses a hydrocracking method for processing a low-sulfur raw material. The method comprises the steps of: hydroprocessing a high-sulfur raw material, and performing gas-liquid separation on a reaction effluent to obtain sulfur-containing hydrogen-enriched gas; hydrocracking low-sulfur raw oil, and performing gas-liquid separation on a reaction effluent to obtain a low-sulfur hydrogen-enriched gas; and mixing the sulfur-containing hydrogen-enriched gas and the low-sulfur hydrogen-enriched gas, selectively performing hydrogen sulfide removal treatment on the gas mixture, and circulating the treated gas mixture to a reactor inlet. According to the invention, two paths of hydrogen-enriched gas of the hydroprocessing process and the hydrocracking process are effectively combined, and the sulfur-containing hydrogen-enriched gas subjected to hydroprocessing is fully utilized to replenish sulfur for a low-sulfur raw material hydrocracking device, so that the problem of sulfur loss of the catalyst during long-term operation of the low-sulfur hydrocracking device is effectively solved. The hydrocracking method disclosed by the invention has the advantages of simplified process flow, low operation cost, low total investment and the like.

Description

technical field [0001] The invention relates to a combined hydrogenation process, mainly referring to the combination of a hydrogenation treatment unit and a hydrocracking unit, especially a hydrocracking unit used for processing low-sulfur raw materials. Background technique [0002] Hydrocracking is a catalytic conversion process in which heavy distillate oil undergoes hydrogenation, desulfurization, denitrogenation, rearrangement of molecular skeleton structure and cracking in the presence of high temperature and high pressure hydrogen and catalyst. It has many advantages such as strong raw material adaptability, flexible product scheme, high yield of liquid products, and good product quality. It has been favored by oil refining companies all over the world for many years. As one of the main processes for deep processing of heavy oil, hydrocracking can not only directly produce clean motor fuels such as gasoline, coal, and diesel, but also light and heavy naphtha and hydr...

AI Technical Summary

Problems solved by technology

Although this method can ensure the activity of the catalyst, it will increase material consumption, human consumption, energy consumption, etc.

[0005] CN99112819.2 introduces a method for supplementing sulfur in a paraffin hydrorefining method. Although the hydrogenation activity of the sulfurized hydrogenation catalyst can be restored without stopping the device, a certain amount of sulfurizing agent is required to be consumed additionally.

[0006] CN93121026.7 introduces a sulfur replenishing method. Although the hydrocarbon oil sulfur replenishing method can ensure catalyst activity, it needs to consume a certain amount of hydrocarbon oil. Although the gas sulfur replenishing method does not need to consume hydrocarbon oil, it requires additional The system injects hydrogen sulfide into the reaction part, which consumes a lot of energy, and at the same time, it is easy to cause air resistance in the raw material oil pump, making it difficult to operate for a long time

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