Integrated hydrocracking method

Abstract

The invention discloses an integrated hydrocracking method. The method includes the following steps: under hydrocracking conditions, high-sulfur raw oil and hydrogen are mixed and then pass through a hydrocracking catalyst bed, high-nitrogen raw oil and hydrogen are mixed and then pass through a hydrocracking catalyst bed, reaction effluents respectively enter hot high-pressure separators and are separated, two routes of produced gas are mixed and injected into washing water and then enter a cold high-pressure separator via a high-pressure air cooler, and the produced hydrogen-rich gas is recycled after passing through a circulating hydrogen desulfurization tower. The integrated hydrocracking method organically combines hydrocracking processes for processing different natures of materials, consequently, on the basis of the normal processing of different natures of poor-quality materials, the respective characteristics of the materials can be sufficiently utilized, and thereby an ideal comprehensive processing effect can be achieved. The method integrates two gas routes together, and has the advantages of little equipment investment, lower operation cost, simplified process flow and the like.

Description

technical field [0001] The invention relates to a combined hydrocracking process, mainly referring to gas circuit combination, especially a combined method for separately processing high-nitrogen raw materials and high-sulfur raw materials by high-pressure hydrocracking. Background technique [0002] Hydrocracking technology has many advantages such as strong feedstock adaptability, flexible product scheme, high liquid product yield, 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 hydrocracking tail oil in its products are high-quality chemical raw materials. Therefore, In recent years, hydrocracking technology has gradually developed into a bridge technology for the organic combination of oil, chemical and fiber in modern...

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Problems solved by technology

[0004] At present, due to the need to process high-sulfur raw materials in the hydrocracking units of most oil refineries, a hydrogen desulfurization tower will be added to the high-pressure gas circuit. The operation of this tower can effectively reduce the concentration of hydrogen sulfide in the circulating hydrogen and reduce the Corrosion of compressors and other equipment, increasing the partial pressure of hydrogen in the reaction system, etc., will increase the primary investment of the device, and will continue to consume lean amine liquid during the operation of the device, which will inevitably lead to a decrease in total revenue

CN1962829 introduces the production method of clean oil, but the operation is relatively complicated; CN101455933 and CN101434381 introduce the tower top purification device and purification method of the circulating hydrogen desulfurization tower, but they all belong to follow-up work, and the investment is relatively large, and they cannot solve the problem of circulating hydrogen at present. The problem of large consumption of lean amine solution in the desulfurization tower

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