A kind of preparation method of hydrocracking catalyst

Abstract

The invention discloses a method for preparing a hydrocracking catalyst, which includes the following contents: 1. Mix the modified Y molecular sieve, amorphous silica-alumina and / or alumina uniformly according to a certain proportion, add dilute nitric acid to form slurry, and then extrude molding, drying, and roasting to obtain a silica-alumina carrier containing modified Y molecular sieve; 2. impregnating the carrier in step 1 with an impregnation solution containing active metals, and drying and roasting the impregnated carrier to obtain a hydrocracking catalyst; wherein the modified The preparation method of Y molecular sieve is as follows: NaY zeolite is used as raw powder for ammonium salt ion exchange, hydrothermal treatment, aluminum salt solution treatment, immersion in organic solvent, and then rapid drying, alkali desiliconization treatment, drying, roasting and other processes to improve Sex Y molecular sieve. The hydrocracking catalyst prepared by the invention has good temperature raising sensitivity and operational flexibility, and has broad application prospects in the hydrocracking reaction process.

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

[0003] At present, modified Y molecular sieve is the most widely used in hydrocracking process. The conventional treatment method has uniform distribution of silicon and aluminum inside and outside the molecular sieve, and uniform distribution of acid centers. When the silicon aluminum ratio of Y molecular sieve is reduced, the acid center density of Y molecular sieve is increased, and the The temperature sensitivity is improved, but at the same time, the secondary cracking is also greatly increased, and the hydrogen consumption is greatly increased

However, when the Y molecular sieve is subjected to advanced treatment and the acid density is too low, the temperature-raising sensitivity of the catalyst is poor.

[0004] 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 temperature-raising sensitivity of the prepared catalyst is Higher, but at the same time, the secondary cracking during the heating process increases significantly, and the hydrogen consumption increases significantly, which is not conducive to the stable operation of the industrial hydrocracking unit during the heating process

[0005] CN200810012212.6 discloses a hydrocracking catalyst carrier and its preparation method. The hydrocracking catalyst prepared by the invention has poor temperature raising sensitivity

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