Preparation of fluid cracking catalyst

Abstract

During the preparation of fluidizing and cracking catalyst, the cracking catalyst component mixture containing alumina from beta-alumina trihydrate and in 1.5-55 wt% of dried and recovered. The catalyst thus prepared has bulk specific weight and pore volume capable of being regulated in a wide range. Compared with catalyst prepared through available technological process, the catalyst of the present invention has differential reaction activity to light oil raised by 2-11 units and differential reaction activity to heavy oil raised by 0.8-12.9 units.

Description

technical field [0001] The invention relates to a preparation method of a fluidized cracking catalyst. Background technique [0002] Catalytic cracking is an important oil refining process, and catalytic cracking units play a pivotal role in the oil refining industry. In recent years, with the continuous increase in the amount of slag added to raw oil, higher requirements have been put forward for cracking catalysts, that is, they have stronger heavy oil macromolecule cracking ability and better light oil selectivity. [0003] In order to ensure the anti-wear strength of the fluidized cracking catalyst and improve its reaction selectivity, the binders used in the prior art mainly include alumina sol binders, pseudoboehmite binders, composite silica-alumina binders, etc. Binder, composite aluminum-based binder composed of aluminum sol and pseudo-boehmite, etc. [0004] USP4010116 discloses a preparation method of a fluid catalytic cracking catalyst, which proposes to use pe...

AI Technical Summary

Problems solved by technology

Although pseudo-boehmite has certain activity and bonding properties, with the adoption of high-silicon-aluminum ratio molecular sieves with small unit cells, fewer acid centers, and low hydrogen transfer activity, the amount of molecular sieve added to the catalyst has increased significantly. The bonding performance of the binder puts forward higher requirements, so pseudo-boehmite can no longer fully meet this requirement

[0005] The preparation method of the catalytic cracking catalyst disclosed in USP4542118 is to use the aluminum sol with better bonding performance as the binding agent to improve the anti-wear performance of the catalyst. However, because the aluminum sol itself is inert, the aluminum sol is used as the binding agent. The prepared catalyst carrier has low cracking activity and limited ability to crack macromolecules. As a single binder, it will affect the cracking performance of the catalyst