Liquid-phase hydrogenation reaction device and liquid-phase hydrogenation reaction method

Abstract

The invention discloses a liquid-phase hydrogenation reaction device and a liquid-phase hydrogenation reaction method. The liquid-phase hydrogenation reaction device comprises an efficient hydrogenation reaction zone and an ultra-deep hydrogenation reaction zone, wherein the efficient hydrogenation reaction zone comprises a down-flow type fixed bed reactor and an up-flow type tubular reactor whichare connected in series, the fixed bed reactor is in an up-flow type or a down-flow type, the tubular reactor is in an up-flow type, the ultra-deep hydrogenation reaction zone comprises a plurality of U-shaped tubular reactors connected in series, and the adjacent tubular reactors are communicated through arc-shaped pipes. According to the invention, the liquid-phase hydrogenation reaction deviceis used for carrying out efficient hydrogenation reaction and deep hydrogenation reaction, so that the hydrogenation reaction rate and the reaction efficiency are effectively improved, the hydrogen utilization rate is increased, the hydrogen consumption and the energy consumption are reduced, the total volume of the reactor is reduced, H2S, NH3 and other gases generated in the reaction process are continuously moved out of the reaction system in the reaction process, the continuous high efficiency of the hydrogenation reaction process is maintained, and deep hydrogenation reaction and ultra-deep hydrogenation reaction are realized.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and specifically relates to a liquid-phase hydrogenation reaction device and a reaction method. Background technique [0002] Oil liquid phase hydrogenation technology is a new type of hydrogenation technology. Compared with the conventional trickle bed gas\liquid\solid three-phase hydrogenation process, it has the advantages of simple process flow, saving investment, reducing production cost and high reaction efficiency. . This is mainly due to the fact that hydrogen is mainly used for mass transfer in the conventional trickle bed hydrogenation reaction process, that is, the speed at which hydrogen diffuses from the gas phase and dissolves into the oil is the rate-controlling step of the entire hydrogenation reaction, while the liquid phase hydrogenation process Then the influence of hydrogen diffusion and mass transfer is eliminated, so that the hydrogenation reaction is carried out in th...

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Problems solved by technology

[0003] With the improvement of people's awareness of environmental protection and the increasingly stringent environmental regulations, the requirements for sulfur content in diesel oil are becoming more and more stringent, and liquid-phase hydrodesulfurization is an ideal hydrogenation method, which is conducive to the realization of efficient hydrogenation and deep hydrogenation , the current liquid-phase hydrogenation reaction in the existing process generally has the following problems: (1) The liquid-phase hydrogenation adopts a traditional fixed-bed reactor, and there is no strict requirement on the selection of the height-to-diameter ratio of the reactor, which is generally 2.5-12. The state of hydrogen dissolving and dispersing in raw oil is unstable. If the height-diameter ratio of the reactor is relatively large and the gas-liquid movement path is long, hydrogen will easily diffuse upward and escape to the top of the reactor. On the one hand, the hydrogenation reaction efficiency will be reduced, and the To achieve the ideal hydrogenation effect, on the other hand, a large amount of hydrogen is wasted; (2) while the material of the conventional liquid-phase hydrogenation reactor is operated by the top-down down-flow type, and a large amount of H 2 S and NH 3 Harmful components such as those that affect the hydrogenation reaction rate diffuse upward and are not easy to diffuse and remove, especially in the early and middle stages of the reaction, when a large amount of H 2 S and NH 3 (3) In the later stage of the hydrogenation reaction, especially when the sulfur content is lower than 350ppm, or even lower than 200ppm, the diesel components contained Sulfur contained in complex molecules such as benzothiophene and dibenzothiophene (especially 4-methyldibenzothiophene and 4,6-dimethyldibenzothiophene) is difficult to remove. Deep hydrogenation under harsh conditions will cause a large amount of loss of aromatics, which is also undesirable, so it is difficult to achieve deep hydrogenation or ultra-deep hydrogenation reaction

This method adopts the method of adsorption desulfurization to achieve deep desulfurization, but there are many problems in adsorption desulfurization, such as low sulfur capacity of the adsorbent, easy penetration, frequent regeneration, complex regeneration system, and high regeneration energy consumption.

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