Tail oil boiling range
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We specialize in distilling 3% of the residual oil at 365°C, while the initial boiling point varies sometimes between 290°C and 310°C. Has anyone encountered this? Why is there such a large variation in the initial boiling point? How to adjust to ensure a temperature above 310°C at all times
It’s likely that the tower separation is not adequate; it’s necessary to maintain a stable temperature at the bottom of the stabilizer, keep the amount of residue at the bottom under control, and regulate the steam injection there. At the same time, the degree of reaction must also be properly controlled
Control problems of the catalytic cracking fractionation tower.
Could you be more specific? Where could we have made a mistake?
You are pumping out too little of the intermediate fraction oil from your fractionation tower; as a result, the amount of tail oil at the bottom increases. At the same time, the light components in the tail oil increase, causing the initial boiling point to drop. Also, an increase in reflux could affect the initial boiling point of the tail oil as well!
Stabilize the bottom temperature of the fractionation tower and increase diesel recovery!
Changes in the draw rate of the fractionation column, changes in the top temperature of the column, changes in the degree of reaction, and changes in the properties of the feed material can all cause this
The tower isn’t being operated properly. What’s there to say? Just stabilize its control, that’s all