A kind of preparation method of high solid content catalytic cracking catalyst

Abstract

The invention provides a preparation method of a high-solid content catalytic cracking catalyst. The method comprises the following steps: (1) mixing pseudo-boehmite, a binder and water and stirring evenly; (2) adding a soluble salt of which an anion is selected from Cl<->, NO3<->, ClO4<->, CH3COO<-> or HCOO<->, stirring evenly and standing; (3) adding an acid to the slurry obtained in the step (2), stirring and adding the acid in multiple times; and (4) adding a molecular sieve and the clay to the slurry obtained in the step (3), pulping and mixing evenly to prepare catalyst slurry, carrying out spray drying, solidification roasting, water adding and stirring, filtering and drying to prepare the high-solid content FCC catalyst. In the process of preparing the high-solid content catalyst by adopting the preparation method, the peptization speed is controllable and the mobility of the slurry is good; and heating and warming are not needed in the peptization process and a hydrochloric acid is replaced with other acids in the acidifying peptization process, so that the damage of a hydrochloric acid gas to the molecular sieve in the catalyst roasting process is avoided and the activity of the catalyst is improved.

Description

technical field [0001] The invention relates to a preparation method of a fluid catalytic cracking (FCC) catalyst, in particular to a preparation method of a pseudo-boehmite-containing FCC catalyst with a high solid content. Background technique [0002] Fluid catalytic cracking (FCC) process is the main means of secondary processing of crude oil, and an important means of deep processing of heavy oil into vehicle fuel at home and abroad. The consumption of FCC catalyst required by the process is increasing with the heavy and poor quality of processing raw materials. Semi-synthetic catalytic cracking catalysts are usually prepared by first mixing molecular sieves, clay and binders in a certain proportion to form a slurry with a solid content of 20-25%, and then spray drying and other steps. Obviously, the higher the solid content of the slurry, the higher the drying efficiency and the lower the energy consumption of the drying process. Increasing the solid content of the s...

AI Technical Summary

Problems solved by technology

By completely replacing pseudo-boehmite with silica sol, the problem of slurry thickening during acidification of pseudo-boehmite can be avoided, but the preparation cost of this method is high and the process is complicated

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