Method for preparing hydrocracking catalyst carrier

Abstract

The invention discloses a preparation method of a hydrocracking catalyst carrier. The method comprises: mixing small-grain Y-type molecular sieves, amorphous silica-alumina and a binder made of alumina, extruding into strips, drying and calcining to make a carrier. In this method, the NaY type molecular sieve raw material with high silicon-aluminum ratio, high crystallinity and good stability is sequentially subjected to alkali washing, ammonium exchange, dealumination of silicon, hydrothermal treatment and treatment with a mixed solution of acid and ammonium salt to obtain The small-grain Y-type molecular sieves obtained higher SiO 2 / A1 2 o 3 While the molar ratio is high, the proportion of secondary pores is high, and the stability of the Y-type molecular sieve is maintained. The molecular sieve has a high specific surface area and a high crystallinity. The hydrocracking catalyst carrier of the present invention is suitable as a hydrocracking catalyst for high and medium oil, and can make the catalyst have good activity, medium oil selectivity and excellent product properties.

Description

Technical field [0001] The invention relates to a preparation method of a hydrocracking catalyst carrier, more specifically, a preparation method of a hydrocracking catalyst carrier containing small crystal grain Y-type molecular sieve. Background technique [0002] As the demand for middle distillates in the international oil market continues to increase, more middle distillates need to be obtained from heavy oils, and the hydrocracking process is one of the important means of lightening heavy oils. Because this process has the characteristics of strong raw material adaptability, good product quality, flexible adjustment and operation, high yield of middle distillate products, and flexible product structure, the status of the hydrocracking process has become more and more important, especially for the current situation in China. With the shortage of petroleum resources, increasingly stringent environmental protection requirements, and the inability of the structure of petroleum ...

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. The stability is poor, and the method is to deal with molecular sieves by gas-phase dealumination and silicon supplementation, which makes the thermal and hydrothermal stability of the product worse and the activity low

In this method, the raw material needs to be treated with ammonium hexafluorosilicate for dealumination of silicon first, and then undergo hydrothermal treatment and other treatments, so as to reduce the collapse of the molecular sieve skeleton structure and improve the crystallization retention of the molecular sieve. After treatment with ammonium hexafluorosilicate for dealumination and silicon supplementation, due to the isomorphic substitution of silicon and aluminum, the molecular sieve silicon oxide aluminum structure is relatively complete, and then hydrothermal treatment will form less secondary pores, and the proportion of secondary pores is low. Catalyst molecular sieve component, medium oil yield is low

[0007] During the preparation process of small-grain NaY molecular sieves in the existing method, silicon and aluminum are easily lost, the utilization rate of silicon is low, and the distribution of silicon and aluminum is not uniform, and it is easy to appear agglomeration, so the existing methods still cannot prepare small-grain NaY molecular sieves with high silicon-aluminum ratio and good thermal stability and hydrothermal stability

After subsequent modification, small-grain Y-type molecular sieves with complete structure, high crystallinity and more secondary pores cannot be obtained. As the cracking component of the catalyst, the yield of medium oil is low