Gasoline riser in catalytic cracking unit
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The purpose of the gasoline riser is to produce more liquefied gas and propylene as well as to reduce the olefin content in gasoline. So, what happens to the olefin content in the crude gasoline produced in the side tubes when the reaction temperature of the gasoline riser is increased?
The question is a bit unclear. May I ask if you are referring to a riser with a packed-bed reactor? The olefin content in crude oil is influenced by various factors: 1. properties of the feedstock, 2. catalyst activity, 3. degree of cracking, 4. ratio of catalyst to oil, 5. amount of gas injected during the reaction, 6. reaction temperature in the reactor bed, 7. reaction time and pressure. As you mentioned, if all other conditions remain unchanged, increasing the reaction temperature in the gasoline riser (within a certain range) should result in a decrease in the olefin content of the crude gasoline.
The purpose of the gasoline riser is to produce more liquefied gas and propylene as well as to reduce the olefin content in gasoline. By increasing the reaction temperature in the gasoline riser, it seems that the olefin content in the crude gasoline produced in the side tubes will increase; thus, while the yield of olefins is high, the olefin content in gasoline also remains high
The owner’s device is a FDFCC device, right? With all other conditions remaining unchanged, theoretically reducing the reaction temperature can lower the olefin content. Don’t all current DCC units reprocess gasoline anymore?