Method for preparing hydro-cracking catalyst composition

Abstract

The invention discloses a method for preparing a hydro-cracking catalyst composition. The method comprises the following steps: 1, modified Y type molecular sieve, amorphous silica-alumina and/or aluminum oxide are well mixed according to a certain ratio; dilute nitric acid is added, such that a slurry is formed; extrusion molding is carried out; and drying and roasting are carried out, such that a silica-alumina carrier containing the modified Y type molecular sieve is obtained; and 2, the carrier obtained in the step 1 is impregnated with an impregnation solution containing active metals; after impregnation, the carrier is dried and the dried carrier is roasted, such that the hydro-cracking catalyst is obtained. A preparation method of the modified Y type molecular sieve comprises the following steps: NaY zeolite is adopted as raw powder; ammonium salt ion exchange, ammonium fluorosilicate dealumination and silicon reinsertion treatment, hydrothermal treatment, and aluminum salt solution treatment are carried out; impregnation is carried out in organic solvents; and fast drying, alkali desilication, drying and roasting treatments are carried out, such that the modified Y type molecular sieve is obtained. The hydro-cracking catalyst composition provided by the invention has good temperature increase sensitivity and operation flexibility. The composition can be widely used in hydro-cracking reaction processes.

Description

technical field [0001] The present invention relates to a method for preparing a hydrocracking catalyst composition. 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 hy...

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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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