A kind of external presulfurization method of hydrogenation catalyst

Abstract

The invention discloses an external presulfurization method of a hydrogenation catalyst. The method is to treat the hydrogenation catalyst in an oxidized state with a passivation technology after being vulcanized, and the passivated catalyst cannot be stored, transported or loaded Nitrogen protection is required, and it can be operated in the air. The beneficial effects of the present invention are: the desulfurization and denitrification activity of the presulfurized hydrogenation catalyst outside the device is better than that of the oxidized hydrogenation catalyst after sulfuration inside the device; the presulfurized hydrogenation catalyst only needs to be heated with nitrogen to achieve It can be put into use at the operating temperature, is simple and convenient to use, significantly reduces production costs, and saves energy; the pre-sulfurization process outside the catalyst is simple, efficient, convenient, friendly to the environment, and does not generate waste water and waste gas.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to an external presulfurization method of a hydrogenation catalyst, which belongs to the improvement of a hydrogenation catalyst preparation method. Background technique [0002] Hydrogenation catalysts are generally composed of Group VIII metals (with Ni or Co as co-active components) and VIB group (with W or Mo as co-active components) metals or metal oxides with hydrogenation function and certain acidic functions. Carrier and auxiliary composition. Among them, the Group VIII and VIB metals exist in the form of oxides, and the active ones are in the sulfurized state during actual use. Therefore, the catalyst needs to be pre-sulfurized before use. [0003] The pre-sulfurization process in the traditional preparation technology adopts the "in-vessel" vulcanization technology, that is, the catalyst in the oxidized state is now loaded into the hydrogenation reactor, and then hydrog...

AI Technical Summary

Problems solved by technology

[0003] The pre-sulfurization process in the traditional preparation technology adopts the "in-vessel" vulcanization technology, that is, the catalyst in the oxidized state is now loaded into the hydrogenation reactor, and then hydrogen gas and sulfidation agent are introduced into the reactor during the continuous heating process. Although this technology is still the most widely used technology at present, it still has a series of problems: (1) the curing time is long; (2) the curing process is easy to cause corrosion and aging of the device; (3) the curing agent is flammable and toxic, Unfriendly to the environment; (4) High cost, etc.

Although the sulfurized catalyst can be air-dried or vacuum-dried, without high-temperature roasting, and without inert gas protection, the catalyst prepared by the impregnation method will cause the migration of active components during the drying process, resulting in uneven distribution of active components, and in situ After crystallization, the mother liquor contains heavy metals, organic vulcanizing agents, organic complexing agents and organic co-solvents, etc., making recycling and sewage treatment difficult