Operation method of vulcanized catalyst

Abstract

The invention relates to an operation method of a vulcanized catalyst, which comprises steps of loading the vulcanized catalyst into a reactor, introducing inert gas to replace air in the reactor and air in pipes in front of and behind the reactor, gradually raising the temperature to the activation temperature, switching hydrogen, adjusting pressure and temperature to reaction pressure and reaction temperature after airflow is stable, and introducing raw oil to carry out hydrogenation reaction, wherein a sulfide precursor containing metal Mo or W, Ni or Co, and a catalyst carrier required by the dipping of the dipping solution of an organic assistant are adopted by the vulcanized catalyst, and can be dried to obtain the vulcanized catalyst. The operation method solves the disadvantages of high preparation cost, long prevulcanization time and high operating cost of the traditional oxidation state catalyst. The catalyst prepared by the method does not need to be pre-vulcanized, and the preparation process and the operation method are simple, and are suitable for preparing the petroleum distillate hydrogenation catalyst. The hydrogenation activity of the catalyst prepared by the operation method is better than that of the traditional catalyst.

Description

technical field [0001] The invention relates to a start-up method of a sulfurized catalyst, in particular to a start-up method for preparing a sulfurized hydrogenation catalyst with a solution containing a metal sulfide precursor. Background technique [0002] Conventional hydrogenation catalysts are in an oxidized state, but the active substances are in a sulfurized state in actual use, so they need to be sulfurized in the reactor before use. Patent CN1171430A describes a typical in-vehicle pre-sulfurization method, wherein the vulcanizing agent is selected from carbon disulfide or dimethyl disulfide, etc., the volume ratio of the vulcanizing agent gas to the catalyst is generally 300-600, and the vulcanization is carried out under normal pressure or high pressure. The general heating and constant temperature program is vulcanization at 200-240°C for 2-6 hours, and then vulcanization at 320-360°C for 8-12 hours. This not only increases the production cost, but also the vul...

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Problems solved by technology

The disadvantage of this patent is that the catalyst needs to be roasted in a protective gas, and the processing cost is high

and the formation of MoS first 2 and WS 2 After the formation of NiS and CoS, it is not conducive to the formation of the active phase of Co-Mo(W)-S or Ni-Mo(W)-S, which affects the hydrogenation activity of the catalyst

[0005] To sum up, the sulfurized catalyst preparation technology reported in the current literature requires inert gas or hydrogen protection during the catalyst preparation process, the process flow is complicated, the processing cost is high, and it cannot be used in large-scale hydrogenation units. The hydrogenation activity of the catalyst is still low. needs improvement

Moreover, the literature does not mention the start-up plan of sulfurized catalysts.

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