Catalytic cracking operation
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Our catalytic unit has just started operating recently; we would appreciate it if experts could provide analysis and suggestions: 1. The processing capacity is 70 tons per hour, the catalyst activity is around 65, the raw material is vacuum wax oil, and the heat load in the external zone is very low. 2. The gasoline yield is around 50%. 3. The diesel yield is low; the 95% point is around 320, and it’s not possible to increase the load further. The load on the bottom of the distillation tower and the first intermediate stage is very low, which makes it difficult to control the liquid level at the bottom of the distillation tower. The absorption process relies entirely on oil from the first intermediate stage as a heat source, resulting in insufficient heat load. Could some expert please offer some advice on how to overcome this current dilemma? Thank you
Consider blending in some residue oil to try raising the residual carbon content to 1–2
Thirdly, ensuring that the dry gas is of satisfactory quality, reduce the amount of supplementary absorbent used; this should be sufficient to meet the load requirements, and even the flow rate of return fluid can be reduced slightly, thereby allowing for a wider range of diesel fractions
The oil has good properties; adding some residue oil can increase the residual carbon content slightly； The liquid level at the bottom of the tower is difficult to control; some feed oil can be added to the tower.