Liquid phase hydrogenation system and liquid phase hydrogenation method

Abstract

The invention discloses a liquid phase hydrogenation system and a liquid phase hydrogenation method. The system comprises a hydrogen dissolving zone and an efficient hydrogenation reaction zone, wherein the hydrogen dissolving zone is internally provided with a plurality of hydrogen dissolving devices, each hydrogen dissolving device comprises a hydrogen dissolving device shell, the hydrogen dissolving device shell internally comprises a plurality of hydrogen dissolving assemblies connected in parallel, the efficient hydrogenation reaction zone comprises a plurality of tubular reactors connected in series, and the tubular reactor is in a U shape and comprises straight pipe sections on the two sides and a horizontal section with the bottom communicated with the straight pipe sections on thetwo sides. According to the method disclosed by the invention, a gas-in-oil type gas-liquid mixed fluid formed in the hydrogen dissolving zone used as the feed of a liquid-phase hydrogenation reaction enters the U-shaped tubular reactor in the efficient hydrogenation reaction zone and is subjected to a deep hydrogenation reaction, so that the supplementary hydrogen-oil ratio during the hydrogenation reaction process can be substantially reduced, the hydrogen utilization rate can be improved, the hydrogen consumption and the energy consumption can be reduced, H2S, NH3 and other gases producedduring the reaction process can be continuously removed from the reaction system, the high hydrogenation reaction rate and the high reaction efficiency can be improved and maintained, and the deep hydrogenation reaction can be achieved.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and specifically relates to a liquid-phase hydrogenation system and a liquid-phase hydrogenation method. Background technique [0002] Compared with the conventional trickle bed gas\liquid\solid three-phase hydrogenation process, the liquid phase hydrogenation technology has the advantages of simple process flow, saving investment, reducing production cost, and high reaction efficiency. In the conventional trickle bed hydrogenation reaction process, hydrogen is mainly used for mass transfer, that is, the speed at which hydrogen diffuses from the gas phase and dissolves into oil is the rate-controlling step of the entire hydrogenation reaction. The liquid-phase hydrogenation process eliminates the influence of hydrogen diffusion and mass transfer, so that the hydrogenation reaction is carried out in the kinetic control zone, that is, the hydrogen is dissolved in the raw material oil to meet t...

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Problems solved by technology

In this method, on the one hand, the combined use of the reaction system, circulation system and heating furnace system makes the reaction process very complicated, costly and difficult to operate; on the other hand, a large amount of circulating materials are introduced, which increases the total volume of the reactor; The sub-ordinary method of hydrogen dissolution and mixing cannot realize the stable dissolution and dispersion of hydrogen, and causes a lot of waste of hydrogen, which reduces the utilization rate of hydrogen; conventional fixed-bed reactors are difficult to achieve deep hydrogenation

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