A kind of preparation method of hydrocracking catalyst

Abstract

The invention discloses a preparation method for a hydrocracking catalyst. The method comprises the following steps: 1) uniformly mixing a modified Y molecular sieve, amorphous silicon aluminum and / or aluminum oxide, adding dilute nitric acid, pulping, extruding into a strip, drying and baking, thereby acquiring a silicon aluminum carrier containing the modified Y molecular sieve, wherein the mass percent of the modified Y molecular sieve in the silicon aluminum carrier is 1%-13%, preferably 2%-10% and the balance is amorphous silicon aluminum and / or aluminum oxide; 2) adopting a steeping liquor containing active metal for steeping the carrier in the step (1), drying and baking the steeped carrier, thereby acquiring the hydrocracking catalyst. The hydrocracking catalyst prepared according to the method disclosed by the invention has excellent reactivity and nitrogen resistance and is especially suitable for a single segment hydrocracking technology.

Description

technical field [0001] The invention belongs to the field of hydrocracking, and in particular relates to a preparation method of a hydrocracking catalyst. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability of raw materials, flexible product scheme, 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 to rationally utilize limited crude oil resources and maximize the 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 series processes is equipped with two reactors, refining and crack...

AI Technical Summary

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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