Ash in catalytic slurry
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Where does the ash in catalytic slurry come from? How can it be reduced? What are the harms of excessive ash?
The ash in catalytic slurry mainly consists of catalysts, metals, and salts. Methods to reduce: 1. Hydrogenation of the catalytic material ； 2. Good reactor cyclone ； 3. Operate the electrodialysis unit properly ； 4. Crude oil decalcification ； 5. Use an oil slurry filter.
The use of chemical additives can reduce the ash content to below 500 ppm; it’s simple and easy to apply. For more details, you can contact me on WeChat at am325a
I checked and there’s no catalyst inside. Is it the salt you mentioned? If it is salt, it should be soluble in water
I would add that ash could also originate from the raw materials used in coking, such as coked naphtha.
Salt dissolves in water, but water cannot completely remove it; if electrodesalination does not work properly, the salt will end up depositing in the oil slurry. Some catalytic units are equipped with electrodesalination systems.
Generally, catalytic dehydrogenation uses purchased raw materials; if a vacuum distillation unit has a dehydrogenation function, then there is no need to operate the catalytic unit
It is difficult to perform electrodesalting on crude oils with high viscosity, such as heavy oil. If electrodesalting is not carried out properly, it has little impact on distillation units, but it has a significant effect on catalytic units. Electrodesalting is much easier for catalyst feedstocks.