Paraffin oil hydrogenation
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We carry out wax oil hydrogenation; the distillation tower has only one side stream. In order to increase the yield of diesel, why do some people suggest raising the reflux temperature at the top of the tower and using as hot a reflux as possible? Another issue is that the tower tends to get flooded; everything seems to be working normally, but sometimes it gets flooded for no apparent reason. Could someone help explain this?
I don’t think it’s completely correct; firstly, the yield of diesel is definitely related to the degree of reaction. At the same depth, when extracting material from the fractionation tower, you first need to analyze the diesel fuel and the components at the top of the tower. You should check whether the diesel fuel meets the specified standards, and whether there is too much overlap between the components at the top of the tower and those in the diesel fuel. If there is excessive overlap, it is necessary to increase the reflux ratio to ensure proper separation. . If you pursue excessive heat reflux without considering the top temperature, it will have the opposite effect.
Submerging a tower involves basically two aspects. It’s not that the heat load at the bottom of the tower is too low, resulting in too little vapor phase. It’s because your reflux ratio is too high, resulting in an excess of liquid phase. Adjustments need to be made based on the specific circumstances; if nothing else is problematic, it could mean that there is sticking in the floating valves of your tray, or that the design is inadequate.
Do the cold reflux and hot reflux at the top of the fractionation tower affect the internal reflux of the tower?