A kind of aluminum sol and its preparation method and application, catalytic cracking catalyst and its preparation method

Abstract

The invention relates to the field of aluminum sol, and provides an aluminum sol and its preparation method and application, as well as a catalytic cracking catalyst and its preparation method. The molar ratio of aluminum to chlorine in the aluminum sol is (1~1.5):1; the corrosion rate of the aluminum sol is not greater than 1.5g / m 2 ·h, pH value is above 2.8, viscosity is above 500mPa·s. The aluminum sol provided by the invention has the advantages of less free chloride ions, optimized structure, high viscosity, low corrosion rate, high pH value, etc., and can be used as a binder in the preparation of catalytic cracking catalysts, and can increase the solid content of the catalyst slurry to 40 More than 30% by weight, the molecular sieve content in the prepared catalyst is reduced to less than 30% by weight. At the same time, the strength and activity of the obtained catalyst meet the requirements for industrial use, and the wear index of the catalyst is significantly reduced.

Description

technical field [0001] The present invention relates to the field of aluminum sol, in particular to an aluminum sol, a method for preparing aluminum sol, and the application of the aluminum sol of the present invention as a binder in the preparation of catalytic cracking catalysts, and a catalytic cracking catalyst and its preparation method. Background technique [0002] Fluid catalytic cracking technology is the most important means of secondary processing of crude oil. With the deepening of the heavy and inferior quality of FCC feed, the content of active component molecular sieve in the catalyst has increased from 15-20% in the early stage to the present 35% or even 40% of the above. With the increase of molecular sieve content, the wear index and sphericity of the catalyst have become a very important issue in the catalyst preparation process. The catalyst must meet a certain strength requirement and at the same time, the catalyst forms microsphere particles with a pa...

AI Technical Summary

Problems solved by technology

The purpose of spray drying is to evaporate excess water in the slurry at a certain temperature. When the solid content is low, more water needs to be evaporated, and the residence time of the material in the drying tower is the same, so more evaporation heat or high drying temperature is required. Moisture escapes rapidly from the inner surface of the particles at high temperature to form hollow spheres or microspheres with apple stalks. On the one hand, the strength of the catalyst will deteriorate, and on the other hand, it will be easily broken when fluidized in the FCC reverse-regeneration system.

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