Process improvement method of vulcanized hydrogenation refining catalyst

Abstract

The invention relates to a process improvement method of a vulcanized hydrogenation refining catalyst. The process improvement method is characterized by comprising the following steps: soaking macroporous alumina powder by adopting a dipping solution containing active metal, carrying out the in-situ crystallization, adding the binder, mixing the binder, carrying out the forming and drying, and then carrying out the roasting under the protection of inert gas to obtain the vulcanized hydrogenation refining catalyst. The method is characterized in that the dipping solution contains an inorganic salt precursor of active metal ammonium molybdate and / or ammonium tungstate and Ni and / or Co and also contains an organic vulcanizing agent, a complexing agent, a dispersing agent and the binder; the in-situ crystallization reaction is carried out in a closed vessel after the dipping solution soaks the macroporous alumina powder to prepare the vulcanized catalyst in one step. The method is simple in procedures, low in cost and uniform in dispersion of active metal.

Description

technical field [0001] The invention relates to the technical field of catalysis, in particular to a method for improving the process of a sulfurized hydrorefining catalyst. Specifically, it relates to a process for preparing a sulfurized hydrorefining catalyst by using a conventional active metal salt precursor in one step. Background technique [0002] Petroleum fraction hydrogenation process is the key technology for the production of clean oil products, among which, high-performance hydrotreating catalyst is the key to hydrogenation technology. [0003] Traditional petroleum distillate hydrogenation catalysts are prepared by loading active components such as cobalt, nickel, tungsten and molybdenum on porous carrier materials to prepare supported solid catalysts. Among them, the active components such as cobalt, nickel, tungsten and molybdenum exist in the form of oxides, but in actual use, a sulfurizing agent is used to convert the active components on the petroleum dis...

AI Technical Summary

Problems solved by technology

The in-vessel sulfidation method is to put the oxidized catalyst into the hydrogenation reactor, and pass hydrogen and sulfidation agent into the reactor during the heating process for pre-sulfurization. The disadvantage of this method is that it needs special pre-sulfurization equipment, The time is long, the cost of vulcanization is high, the vulcanization agent is highly toxic and flammable, and it is easy to cause pollution to people and the environment

This type of sulfide precursor is not a bulk chemical and requires special equipment for synthesis, and a large amount of wastewater containing sulfur, nitrogen and heavy metals is produced during the synthesis process; this type of sulfide precursor is easily oxidized in the air and has poor storage stability, which will lead to The catalyst preparation process is long and the cost is greatly increased

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