Hydrotreating method of product circulation

Abstract

The invention discloses a hydrotreating method of product circulation. One part of circulation of a hydrotreated liquid phase product is mixed with a raw material into a liquid phase material, and the liquid phase material enters the upper part of a reactor. The hydrotreating method of product circulation is characterized in that the upper part of the reactor is provided with at least one air-lift tray of which the lower part is introduced with hydrogen; the hydrogen and the liquid phase material contact on the air-lift tray for the air lift of hydrogen sulfide and ammonia in the liquid phase material; meanwhile, hydrogen is further dissolved in the liquid phase material; the air-lift liquid phase material enters a catalyst bed on the lower part of the reactor for hydrotreating reaction; and air-lift gas containing hydrogen sulfide and ammonia is discharged from the top of the reactor. The reactor adopted by the invention simultaneously has the action of catalytic hydrotreating reaction and the action on causing products H2S, NH3 and the like to be discharged out of a reaction system by air lift, thus greatly improving hydrotreating reaction efficiency and enhancing technology flexibility and raw material adaptability.

Description

technical field [0001] The invention relates to a hydrogenation treatment method for product circulation, in particular to a liquid phase hydrogenation treatment method for increasing dissolved hydrogen through liquid phase product circulation. Background technique [0002] In the conventional fixed-bed hydrogenation process, in order to remove impurities such as sulfur, nitrogen, oxygen, and metals in the raw material or reduce the size of the raw oil molecule, catalytic hydrogenation reaction is required. In order to control the reaction temperature of the catalyst bed and avoid catalyst deactivation due to carbon deposition, a larger hydrogen-to-oil volume ratio is usually used, and there must be a large amount of hydrogen surplus after the hydrogenation reaction is completed. The excess hydrogen is usually pressurized by the circulating hydrogen compressor and then mixed with new hydrogen to continue as the hydrogen feed for the reaction. This process can also be define...

AI Technical Summary

Problems solved by technology

But it does not completely solve the H that will be produced during the hydrofining reaction 2 S, NH 3 The problem of removal of harmful impurities, such as harmful impurities, leads to their continuous accumulation in the reactor, which greatly reduces the reaction efficiency, and cannot effectively process raw materials with high sulfur and nitrogen content.

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