Integrated hydroprocessing method

Abstract

The invention discloses an integrated hydroprocessing method. The method includes the following steps: under hydroprocessing conditions, high-sulfur raw oil and hydrogen are mixed and then pass through a hydroprocessing catalyst bed, high-nitrogen raw oil and hydrogen are mixed and then pass through a hydroprocessing 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 hydroprocessing method organically combines hydroprocessing 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 hydrogenation method, mainly referring to the combination of hot and high-separation gas paths, which is suitable for various catalytic hydrogenation methods for separately processing high-nitrogen raw materials and high-sulfur raw materials. Background technique [0002] Catalytic hydrogenation is of great significance for improving the processing depth of crude oil, rationally utilizing petroleum resources, improving product quality, increasing light oil yield and reducing air pollution. Especially as crude oil becomes heavier and worse, there is an increasing demand for middle distillates, and catalytic hydrogenation has become an important process in petroleum processing. In addition, due to the increase of sour crude oil, catalytic hydrogenation is more important. Catalytic hydrogenation is a general term for catalytic processing of petroleum fractions in the presence of hydrogen. Currently, there are two main...

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Problems solved by technology

[0004] At present, due to the need to process high-sulfur raw materials, the catalytic hydrogenation units of most oil refineries will add a circulating hydrogen desulfurization tower to their high-pressure gas lines. The operation of this tower can effectively control the hydrogen sulfide concentration in the circulating hydrogen and improve the efficiency of the reaction system. Hydrogen partial pressure, thereby reducing the steam energy consumption of the circulating hydrogen compressor and reducing the corrosion of the compressor and other equipment caused by the circulating hydrogen, but it will increase the primary investment of the device, and will continue to consume lean amine liquid during the operation of the device, although There is a solvent regeneration system, but the energy consumption and material consumption are still relatively large, which will inevitably lead to a decrease in total revenue

CN1962829A introduces the production method of clean oil, but the operation is relatively complicated; CN101455933A and CN101434381A 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. Consumption of lean amine solution and large energy consumption in the desulfurization tower

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