The effect of metal ions on catalytic cracking catalysts
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Our unit is a full-normal residue catalytic cracking unit. Since the beginning of this year, there have been significant changes in the raw materials, which has had a major impact on both the processing volume and yields. Please take a look to determine what the problem is – whether the levels of these various ions are within normal ranges. CaCuFeNaNiSbSnVppmppmppmppmppmppmppmppmppm466607159666242941545013543054054315802346662301228 inflation density, compacting density, pore volume, specific surface area, sedimentation density, particle size 0-20μm, particle size 20-40μm mg/mL g/mL mL/g % m2/g g/mL %% 0.1660135 06.10.90.990.15541160.9107.2 particle size 40-60μm, particle size 60-80μm, particle size 80-111μm, particle size >111μm%%%% 20.522.425.525.526.226.625.414.6
Calculate the pollution index, replace the system balance agent, and improve activity and yield as soon as possible.
Why are the specific surface area and microactivity so low? ? ?
Take a look at the section on catalyst heavy metal contamination in the FAQ on catalytic cracking technology; it’s quite detailed.
For the feedstock in heavy oil catalytic cracking units, it is essential to control the sodium ion content, which should generally be below 1–2 ppm. This is because sodium deposited on the catalyst neutralizes its acidic sites and forms eutectic compounds with the catalyst matrix; at the temperature used for catalyst regeneration, the melting of this matrix can cause damage to the micropores, resulting in permanent deactivation of the catalyst. Toxicity at the acid sites, on the other hand, reduces the octane number of catalyzed gasoline.