Preparation method of prevulcanization type catalyst

Abstract

The invention discloses a preparation method of a prevulcanization type catalyst. The method consists of: taking an oxidation state catalyst, adding an organic solvent and elemental sulfur, conducting heat treatment, then using an appropriate organic assistant to perform aftertreatment on the catalyst, thus obtaining the final prevulcanization type catalyst. The method enables the organic assistant and sulfur to form an organic compound, which does not decompose at low temperature, thus avoiding untimely contact of hydrogen and sulfur during startup activation, release of a hydrogen sulfide gas and the consequent influence on equipment air tightness. After high pressure air sealing, the compound of sulfur and the organic assistant decomposes. Hydrogen and sulfur react, the formed hydrogen sulfide and an active metal undergo catalyst activation in the pores of the catalyst, thus raising the initial temperature of vulcanization. After high pressure air sealing, activation oil is introduced to take away the heat generated by activation timely, thus avoiding temperature runaway of the catalyst bed and ensuring a smooth startup process. The catalyst prepared by the method involved in the invention is applicable to preparation of a petroleum fraction hydrogenation catalyst.

Description

technical field [0001] The invention relates to a preparation method of a presulfided catalyst, which is especially suitable for the presulfided hydrogenation catalyst. 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. This not only increases the production cost, but also the vulcanization process is likely to cause pollution to people and the environment, so external pre-vulcanization came into being. External presulfurization refers to the introduction of vulcanizing agent into the pores of the oxidized catalyst by sublimation, melting or impregnation, and then the catalyst is partially presulfurized by heating treatment in the presence of inert gas, and finally the catalyst is loaded into the reactor. The final presulfidation of the catalyst is done in the presence of hydrogen. According to the existence s...

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Problems solved by technology

However, there are also deficiencies. Since the complex or oxysulfide formed by the active metal and the vulcanizing agent is easily decomposed under the action of hydrogen, the active metal will be vulcanized prematurely at low temperature after the introduction of hydrogen, releasing hydrogen sulfide gas, which affects the performance of the device. airtight

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