Start working method for hydrocracking process

Abstract

The invention discloses a hydrocracking process operation method. Hydrocracking pre-refining catalyst is treated by precuring outside a reactor while hydrocracking catalyst is not treated or is partially treated by precuring outside the reactor. Curing ingredient introduced by the hydrocracking pre-refining catalyst and the hydrocracking catalyst precured outside the reactor accounts for 90-120% of the theoretical sulfur demand for all the catalyst. The hydro cracking pre-refining catalyst and the hydro cracking catalyst are layered in the reactor and then activated by heating, so that all the catalyst is sulfurated effectively. The method of the invention can precure the hydrocracking pre-refining catalyst outside the reactor or precure the hydrocracking pre-refining catalyst and partial hydrocracking catalyst outside the reactor, thus reducing the catalyst requiring precuring outside the reactor, reducing the production period and production cost of the precuring catalyst and improving the economic benefit and production security.

Description

technical field [0001] The invention relates to a start-up method of a hydrocracking process, in particular to a start-up method of a hydrocracking process using an external presulfided catalyst. technical background [0002] In the past ten years, due to the slow growth of crude oil production and the increasingly heavy quality, while the market demand for light oil products has continued to increase, coupled with increasingly stringent environmental protection regulations, therefore, the world has paid special attention to oil upgrading technology . Hydrocracking technology is the best means for deep processing of heavy oil to produce high-quality clean fuel, and its application is becoming more and more extensive. The active metal components of hydrocracking catalysts will have high catalytic activity only when they are transformed into sulfurized state, so catalyst presulfidation is very important to fully exert the catalyst performance. The presulfurization method of ...

AI Technical Summary

Problems solved by technology

Its main disadvantage is that the amount of catalyst that needs to be presulfurized outside the device is large, the pretreatment process outside the device takes a long time, and the processing cost increases. , which may affect the on-time start-up of the hydrocracking unit

In addition, the hydrocracking catalyst contains acidic cracking active components (such as molecular sieves, etc.), and the external presulfurization usually needs to be carried out in the presence of organic solvents. Cracking reaction occurs, and then accidents such as over-temperature occur