Preparation method of low-abrasion fluidized bed microspherical catalyst
A catalyst, low-wear technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve problems such as difficulty in controlling molecular sieve particle size and crystallinity, unfavorable modification, etc. Sexually wide effect
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Embodiment 1
[0028] Disperse ZSM-5, aluminum sol, kaolin, and turnip powder in water according to the ratio of solid content of 40%, 40%, 20%, and 10% (by molecular sieve weight) to make a slurry with a solid content of 30% , spray until the particle size of the slurry is lower than 6μm, the air inlet temperature is 400°C, and the air outlet temperature is 130°C, control to obtain particles with a particle size of less than 40μm, add water to disperse, and prepare a slurry with a solid content of 30%, shear Afterwards, spray again, the spraying condition is 390°C for the air inlet, 170°C for the air outlet, and control to obtain particles with a particle size distribution of 20-150 μm and an average particle size of 85 μm. After calcining at 550°C for 8 hours, a low-wear fluidized bed catalyst was obtained. The resulting catalyst attrition index was 0.48%.
Embodiment 2
[0030] ZSM-5, colloidal silica, kaolin, and starch are dispersed in water at a ratio of 30%, 20%, 50%, and 10% (by molecular sieve weight) according to the solid content, to make a slurry with a solid content of 35%. Spray after cutting until the particle size of the slurry is less than 6 μm, the air inlet temperature is 380°C, and the air outlet is 140°C, control to obtain particles with a particle size of less than 40 μm, re-add water to disperse, prepare a slurry with a solid content of 30%, and re-shear after cutting For spraying, the spraying conditions are 400°C air inlet and 150°C air outlet, controlled to obtain particles with a particle size distribution of 20-300μm and an average particle size of 70μm. After calcining at 650°C for 12 hours, a low-wear fluidized bed catalyst was obtained. The abrasion index was 0.54%.
Embodiment 3
[0032] SAPO-34, silica sol, pseudo-boehmite, and safflower powder are dispersed in water at a ratio of 40%, 10%, 50%, and 5% (by molecular sieve weight) according to the solid content, and the solid content is 35%. % of the slurry, cut until the particle size of the slurry is less than 6 μm, then spray, the air inlet temperature is 380 ° C, the air outlet temperature is 140 ° C, and the particles with a particle size of less than 40 μm are controlled, and then added to water for dispersion to prepare a slurry with a solid content of 40%. After shearing, re-spray, repeat the above spray-shearing process 3 times, the final slurry spraying conditions are 370°C inlet air, 150°C outlet air, controlled to obtain particles with a particle size distribution of 20-150μm and an average particle size of 75μm. After calcining at 520°C for 10 hours, a low-wear fluidized bed catalyst was obtained. The abrasion index was 0.54%.
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