A liquid-phase hydrogenation reaction device and reaction method

Abstract

The invention discloses a liquid-phase hydrogenation reaction device and a reaction method, including a high-efficiency hydrogenation reaction zone and an ultra-deep hydrogenation reaction zone; the high-efficiency hydrogenation reaction zone includes a series downflow fixed-bed reactor and an upflow tubular reactor Reactor, wherein the fixed bed reactor is upflow or downflow, and the tubular reactor is upflow; the ultra-deep hydrogenation reaction zone includes a plurality of "U-shaped" tubular reactors connected in series, and the adjacent tubular reactors The reactors are connected by arc tubes. The present invention adopts the above-mentioned liquid-phase hydrogenation reaction device to carry out high-efficiency hydrogenation reaction and deep hydrogenation reaction, effectively improve the hydrogenation reaction rate and reaction efficiency, improve the hydrogen utilization rate, reduce hydrogen consumption and energy consumption, and reduce the total volume of the reactor , during the reaction process, the H generated during the reaction process is continuously 2 S, NH 3 Wait for the gas to move out of the reaction system, maintain the continuous high efficiency of the hydrogenation reaction process, and realize deep hydrogenation reaction and ultra-deep hydrogenation reaction.

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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