Method for preparing microsphere FCC (fluid catalytic cracking) catalyst

Abstract

The invention provides a method for preparing a microsphere FCC (fluid catalytic cracking) catalyst, wherein the method comprises the following steps: beating a molecular sieve, clay, pseudo boehmite and acid to obtain catalyst slurry, and spray-drying the catalyst slurry, and in the spray-drying process, spraying is performed through a spray nozzle, then drying is performed, and the spray nozzle comprises a spray nozzle main body with a cavity, wherein a spray nozzle inlet and spray holes are formed in the spray nozzle main body, a diversion part protrudes downwards from the top wall of the cavity of the spray nozzle main body, and the space between the outer surface of the diversion part and the inner surface of the cavity forms a rotation chamber. When the spray nozzle provided by the invention is used for spray-drying, the atomization effect is good, and when the spray nozzle is used for spray-drying to prepare the FCC catalyst, the prepared FCC catalyst has good sphericility. By adopting the method provided by the invention, the microsphere FCC catalyst with good sphericility can be obtained.

Description

technical field [0001] The invention relates to a method for preparing microsphere FCC catalyst. Background technique [0002] The shape of FCC catalyst particles is very close to that of a sphere observed under a microscope, but not all FCC catalyst particles are complete spheres, and there are large differences in their shapes. The sphericity of FCC catalyst refers to the degree of shape similarity between FCC catalyst particles and spheres. Sphericity is an important physical property of FCC catalysts. The sphericity of FCC catalyst not only affects the fluidization performance of the catalyst, but also is closely related to the wear resistance of the catalyst. Catalysts with poor sphericity are prone to wear during use. The running loss of fine powder produced by wear will not only increase the consumption of catalyst but also pollute the environment; in addition, the fine powder produced by catalyst wear may also affect subsequent equipment such as hoods, which is no...

AI Technical Summary

Problems solved by technology

Catalysts with poor sphericity are prone to wear during use

The running loss of fine powder produced by wear will not only increase the consumption of catalyst but also pollute the environment; in addition, the fine powder produced by catalyst wear may also affect subsequent equipment such as hoods, which is unfavorable for the long-term operation of the catalytic cracking unit

[0003] CN1160436C discloses a method for preparing a catalytic cracking catalyst, which uses the viscosity of the catalyst slurry as a control index to adjust the amount of inorganic acid added during the acidification of pseudo-boehmite, and this method can avoid fluctuations in acid consumption due to pseudo-boehmite Causes fluctuations in catalyst strength and pore volume, but it is found through experiments that the catalyst prepared by this method has poor sphericity

The sphericity of FCC catalyst prepared by conventional pressure nozzle is not good

Under the microscope, the shape of FCC catalyst particles is relatively close to that of a sphere, but the FCC catalyst particles are not all complete spheres, and there are large differences in their shapes. The particle size and shape analyzer CamsizerXT of German Lai Chi company is used to measure the FCC catalyst prepared by the existing technology. The sphericity of FCC catalyst is only about 0.91

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