Preparation method and application of modified Y molecular sieve and single-stage hydrocracking catalyst

Abstract

The invention discloses a preparation method and application of a modified Y molecular sieve and a single-stage hydrocracking catalyst. The method comprises the following contents: (1) carrying out ammonium salt ion exchange on NaY zeolite as a raw material; (2) carrying out isomorphous substitution treatment on the Y molecular sieve in the step (1); (3) carrying out hydro-thermal treatment on the Y molecular sieve treated in the step (2); (4) carrying out acid dealumination treatment on the Y molecular sieve treated in the step (3); (5) carrying out fast drying treatment on the Y molecular sieve treated in the step (4); (6) carrying out carbon deposit reaction on the Y molecular sieve obtained in the step (5); (7) carrying out desilicication treatment on the molecular sieve obtained in the step (6); and (8) filtering and drying the Y molecular sieve subjected to desilicication treatment in the step (7) and carrying out charking treatment to obtain a modified Y molecular sieve. The single-stage hydrocracking catalyst prepared from the modified Y molecular sieve prepared through the method is applied to a single-stage hydrocracking process and has good reaction activity and nitrogen resistance.

Description

technical field [0001] The invention belongs to the field of hydrocracking, and in particular relates to a preparation method and application of a modified Y molecular sieve and a single-stage hydrocracking catalyst. 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 p...

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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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