A liquid-phase hydrogenation process and liquid-phase hydrogenation reactor

Abstract

The invention discloses a liquid phase hydrogenation process and a liquid phase hydrogenation reactor. The process includes the following content: the hydrogen-dissolving raw material oil enters the hydrogenation reaction section and contacts with the hydrogenation catalyst to undergo a hydrogenation reaction, and the obtained reaction effluent enters the nano / micron hydrogen injection section and mixes with the nano / micron hydrogen dispersed through the ceramic membrane tube , the mixture stream enters the stripping section to contact with the hydrogenation catalyst for hydrogenation reaction, and at the same time, the hydrogen gas transfers the H in the stream 2 S, NH 3 The reaction gas is extracted and discharged through the gas outlet at the top of the arc tube, and the liquid-phase reaction effluent flows out from the reaction outlet. The present invention realizes the continuous efficiency and uniformity of the hydrogenation reaction process by setting a reactor with a special structure. During the reaction process, H 2 S, NH 3 The gas that inhibits the reaction is removed from the reaction system in time, which is conducive to improving the hydrogenation reaction rate and realizing deep hydrogenation.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, in particular to a liquid phase hydrogenation process and a liquid phase hydrogenation reactor. Background technique [0002] The liquid-phase hydrogenation reactor in the prior art is generally a conventional liquid-phase hydrogenation reactor. The raw material oil hydrogen is first mixed with a static mixer and then enters the hydrogenation reactor for hydrogenation reaction. During the reaction process, hydrogenation and desulfurization By-product H 2 S also has obvious inhibitory effect on hydrodesulfurization, hydrodenitrogenation and hydrodearomatization reactions. There are two main reasons: one is because the H 2 The partial pressure of S can affect the activation energy of the hydrodesulfurization reaction. Taking toluene as an example, when the partial pressure of hydrogen sulfide is 0, the activation energy of the reaction is 16kcal / mol. When H 2 When the partial pressure of S ...

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Problems solved by technology

[0003] Therefore, from the perspective of the liquid-phase hydrogenation reaction process in the prior art, there are mainly the following problems: (1) Hydrodesulfurization by-product H in the reaction process 2 S also has obvious inhibitory effect on hydrodesulfurization reaction, hydrodenitrogenation and hydrodearomatization reaction, and cannot be removed in time during the reaction process, which has an adverse effect on the realization of deep hydrogenation; (2) the raw material oil in the reaction feed The amount of hydrogen that can be dissolved is small. For the hydrogenation reaction process with a slightly larger hydrogen-to-oil ratio, it is far from meeting the needs of hydrogen consumption. A large amount of circulating oil is required for auxiliary dissolution, which greatly reduces the reaction efficiency. , while increasing the volume of the reaction system; (3) The reaction process is uneven, mainly due to the uneven dispersion of hydrogen in the raw oil, which makes the liquid phase hydrogenation reaction process have problems of uneven reaction and local hot spots, which affect the use of catalysts life

In this method, on the one hand, the H 2 S is removed, but the H generated during the reaction 2 S has not been removed in time, and still has a certain inhibitory effect on the hydrodesulfurization reaction; on the other hand, a large amount of solvent or circulating oil is introduced to dissolve hydrogen during the reaction process, which will inevitably increase the volume and complexity of the reaction system, making production Process investment and energy consumption are high

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