What are the reasons for the low propylene content in liquefied gas during catalytic cracking?
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For some time, the propylene content in the liquefied gas at our plant has been very low. What could be the reasons? Properties of the raw material? Catalyst poisoning? It’s still a change in operation
Catalyst poisoning, low activity: (Is the carbon trimethyl content high in the dry gas?)
High catalyst activity or a high catalyst-to-oil ratio accelerate the hydrogen transfer reaction, resulting in a decrease in the olefin content.
The oil-to-fuel ratio here is relatively high. The problem is that it has always been high, around 6.5–7