Method for improving solid content of catalytic cracking catalyst slurry

Abstract

The present invention is method of raising solid content in catalytic cracking catalyst slurry. The method includes mixing clay, molecular sieve slurry, aluminum-containing binder, pseudo boehmite and inorganic acid to form catalyst slurry and the subsequent spray drying. It features that the addition of inorganic acid before adding pseudo boehmite and the molecular sieve, and the addition of inorganic acid after adding kaolin and aluminum-containing binder or into the aluminum-containing binder. The present invention can raise the solid content in catalyst slurry to over 40 % to short the colloid forming time greatly, raise the catalyst producing efficiency and lower catalyst producing cost while ensuring the wear strength of catalyst. At the same time, the catalyst has great pore volume, high micro reaction activity and improved comprehensive reaction performance.

Description

technical field [0001] The invention relates to a method for increasing the solid content of catalytic cracking catalyst slurry, which is suitable for the preparation of catalytic cracking catalyst used in petroleum processing and can greatly increase the solid content of slurry for preparing the catalyst. technical background [0002] Fluid Catalytic Cracking (FCC for short) process is the main process of secondary processing of crude oil, and an important means of deep processing of heavy oil at home and abroad to produce vehicle fuel. With the increasing quality and inferiority of processing raw materials and the increasing demand for vehicle fuel, the consumption of FCC catalyst required by this process is increasing; at the same time, due to the demand for processing heavy oil and the development of FCC process technology, molecular sieve active components are in The proportion in FCC catalysts also shows an increasing trend. Generally speaking, the process of preparin...

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Problems solved by technology

[0010] When the existing Pseudo-boehmite acid-adding process is used to prepare the FCC catalyst of the aluminum sol composite aluminum-based binder, the production process reported by domestic and foreign patents all adopts the process step of adding acid after the pseudo-boehmite (such as USP4476239, CN1081218C, CN1098130A etc.), the solid content of the catalyst slurry prepared according to the existing acid addition process or improved process can be controlled at 25-50%. One of the outstanding problems at present is that the inorganic acid is added after the pseudo-boehmite. The reaction with pseudo-boehmite is difficult to occur uniformly, and there is always a local over-reaction phenomenon, resulting in a rapid increase in the viscosity of the slurry; the second outstanding problem is that when the molecular sieve slurry is added before, the addition of inorganic acid will inevitably cause local Destroy the molecular sieve phenomenon, and because the acidity of the system cannot be controlled too low (generally, the pH is greater than 2.8), it is difficult to fully refine the pseudo-boehmite, especially when the molecular sieve content is high (such as greater than 40%), the wear resistance of the catalyst become worse, the performance will be greatly affected