Treatment of heavy metals in catalysts of catalytic devices?
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In catalytic cracking units, the catalysts contain high levels of heavy metals; are there any good treatment methods available at present? What technologies can be used to remove heavy metals? Which companies in China are doing well in this area? High-quality ones come with big rewards!
Oil products: kinematic viscosity, residue, ash, sodium, vanadium, aluminum + silicon, calcium, zinc, phosphorus. For oil slurry: 30787280.567; 11.415; 2.4 + 365.62; 1.20.51; 17.05. For desulfurized oil: 29.57; 12.73; 1647.94 + 94.5; 160.59; 1.18; 2.42. Can filtration be used to achieve a residue level of ≤15, an ash level of ≤0.07? ICP analysis can be used to determine the levels of heavy metals: sodium ≤50, aluminum plus silicon ≤50, vanadium ≤150, calcium ≤30, phosphorus ≤15, zinc ≤15.
Adding a metal passivator can passivate nickel vanadium, and the residual carbon can be reduced by blending wax oil
Currently, oil slurry is a by-product, and it can still be used in coking blending. The ratio of catalytic raw materials will not be adjusted as a result, thereby avoiding a reduction in profits. Adding slurry scale inhibitors is possible, but the removal of heavy metals will be relatively low! Are there other ways to reduce the heavy metal content in the slurry according to the current standards?
The metals are all on the surface of the catalyst; therefore, by reducing the wear index of the catalyst and causing wear on its surface, it is possible to lower the metal content in the catalyst.
How can it be reduced, and what technologies can be used?
Do metal passivators work? Personally, I don’t think it’s very effective; it’s better to address the problem at its source. Once the heavy metals in the raw materials are reduced, there will be no problem.
The key is to reduce it to ppm levels. Can it be achieved just by using additives?
Use less binder in the production of catalysts. Current catalysts are too hard, with wear rates around 1.0%. If the regenerator does not experience any agent loss, the wear rate can be reduced to 3.0%, and in some cases, it can even be brought down to no more than 5.0%.
It is best to remove heavy metals from the raw materials through pretreatment; metal passivators can render the heavy metals on the catalyst surface inactive, but they cannot remove them. The method mentioned upstairs seems to be quite good: since the metals are all on the surface of the catalyst, reducing the wear rate of that surface can lead to a decrease in the metal content of the catalyst. After being added, the passivator first deactivates it, and then it wears away gradually – which seems good. With such high levels of P residue, what is the effectiveness of using scale inhibitors in fuel slurry at present?
In what forms do heavy metals exist respectively? How to get out? Can filtering work?