A kind of hydrocracking catalyst and its preparation method and application

Abstract

The invention discloses a hydrocracking catalyst and a preparation method thereof. Based on the total weight of the catalyst, it includes the following components: 30% to 80% of silicon-aluminum carrier containing modified Y molecular sieve, and 20% to 70% of active metal, wherein The active metal is calculated as metal oxide; the mass percentage of the modified Y molecular sieve in the silica-alumina carrier is 1% to 13%, preferably 2% to 10%, and the balance is amorphous silica-alumina and / or alumina. ; The unit cell constant of the modified Y molecular sieve is 2.425~2.440; the bulk silicon-aluminum ratio is 20~50, of which the surface layer silicon-aluminum ratio is 50~120, preferably 60~100, and the surface layer silicon-aluminum ratio is 10~ higher than the bulk phase silicon-aluminum ratio. 80, preferably 15~50. Preparation method: Use an impregnating liquid containing active metal to immerse a carrier including modified Y molecular sieve, amorphous silica aluminum and / or alumina, and then dry and roast to obtain a hydrocracking catalyst. The hydrocracking catalyst of the invention is used in a single-stage hydrocracking process and has good reactivity and nitrogen resistance.

Description

technical field [0001] The invention relates to a hydrocracking catalyst and its preparation method and application. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, flexible product plan, high selectivity of target products, good product quality and high added value, and can directly produce a variety of high-quality petroleum products and chemical raw materials. Therefore, this technology has become the most suitable refining technology for rational utilization of limited crude oil resources, maximum production of clean petroleum products and high-quality chemical raw materials. Hydrocracking technology can be mainly divided into three types according to the processing flow: one-stage series hydrocracking process, single-stage hydrocracking process and two-stage hydrocracking process. One of the serial process flow sets up two reactors, refining and cracking. In the refining reactor, a hydrotreating ca...

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Problems solved by technology

In this way, although the catalyst has strong nitrogen tolerance, the catalyst activity is poor, and the reaction temperature usually exceeds 400 ° C.

Due to the high reaction temperature, limited by the thermodynamic equilibrium of hydrogenation saturation of aromatic hydrocarbons, too high reaction temperature is unfavorable to the hydrogenation saturation reaction of aromatic hydrocarbons, and the product properties are poor

The higher reaction temperature also accelerates the carbon deposition and deactivation of the catalyst, which affects the operation cycle of the hydrocracking unit.

[0005] CN200710158784.0 discloses a hydrocracking catalyst containing Y molecular sieve and its preparation method. In this invention, Y-type molecular sieve is obtained after hydrothermal treatment with a mixed aqueous solution of aluminum salt and acid, and the obtained catalyst has high activity. But nitrogen tolerance is poor

[0006] CN98114489.6 discloses a nitrogen-resistant hydrocracking catalyst for high-yielding middle oil, which is used for one-stage serial hydrocracking of heavy distillate oil to produce a large amount of middle distillate oil. The nitrogen content of the feed in the cracking section can reach 100 μg / g, but the Catalyst activity is poor

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