Method for preparing hydrocracking catalyst

Abstract

The invention discloses a method for preparing a hydrocracking catalyst. The method comprises the following steps of uniformly mixing modified Y molecular sieves, amorphous silica-alumina and / or alumina according to a certain proportioning ratio, adding dilute nitric acid into the mixture so as to carry out pulping, then, carrying out strip-extruding forming, drying and roasting so as to obtain a silica-alumina carrier containing the modified Y molecular sieves, then, dipping the silica-alumina carrier by active ingredients, and carrying out drying and roasting, so as to obtain the hydrocracking catalyst, wherein the bulk-phase silica-alumina ratio of the modified Y molecular sieves is 9 to 50, the surface layer SiO2 / Al2O3 silica-alumina ratio is 30 to 120, and the surface layer silica-alumina ratio is higher than the bulk-phase silica-alumina ratio; and the modified Y molecular sieves have the specific surface area of 650m<2> / g to 900m<2> / g and the pore volume of 0.30ml / g to 0.50ml / g. The hydrocracking catalyst prepared by the method has good reaction activity and nitrogen resistance and has a broad application prospect in hydrocracking reaction processes of diesel oil multiproduction, chemical raw material multiproduction, diesel oil hydro-conversion catalysis and the like.

Description

technical field [0001] The invention relates to a preparation method of a hydrocracking catalyst. Background technique [0002] Hydrocracking technology has the characteristics of strong adaptability to raw materials, great flexibility in production operations and product plans, and good product quality. It can directly convert various heavy and low-quality feedstocks into high-quality jet fuel, diesel, and lubricating oil base materials that are urgently needed by the market. As well as chemical naphtha and tail oil steam cracking raw materials for ethylene production, it has become one of the most important heavy oil deep processing processes in modern oil refining and petrochemical industries, and has been increasingly widely used at home and abroad. The heart of the hydrocracking process is the hydrocracking catalyst. Hydrocracking catalyst is a typical dual-function catalyst, which has dual functions of hydrogenation and cracking. Among them, the hydrogenation functio...

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Problems solved by technology

In this way, there is an unsolvable contradiction between improving the nitrogen resistance of the catalyst and maintaining the hydrocracking activity. It is difficult to take care of these two problems at the same time in the conventional molecular sieve modification process.

[0003] 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

[0004] CN200810012212.6 discloses a hydrocracking catalyst carrier and its preparation method. The hydrocracking catalyst prepared by the invention has high nitrogen tolerance but low cracking activity

[0005] 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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