On the issue of overlapping adjustments for catalytic gasoline and diesel
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Currently, the dry point of gasoline is 210, while the initial boiling point of diesel is 180, resulting in an overlap of 30 degrees. I would like to ask the experts how to adjust the flow rates and temperatures in stage one and the top circulation system. Currently, there is no salt deposition in the distillation tower; trying to adjust the flow rates in stage one and the top circulation system has had little effect. The temperature of the fluid returning to the tower in stage one has been increased to 212, while the temperature at which diesel is extracted is around 216
This phenomenon occurs in all cases; in our case as well the angles of overlap are nearly 20 degrees, and it’s difficult to achieve a complete separation. It is possible to adjust the distillation outlet and the reflux volume appropriately, while paying attention to maintaining balance.
Should the diesel extraction from your distillation tower be carried out at a lower level? If not, it will be necessary to adjust the temperatures and flow rates of the intermediate stage and the oil slurry returning to the system; the dry point of gasoline can be adjusted by modifying the top circulation
There should be a premise for this: within a certain range, increase the return flow! If the turning point is passed, things often turn out the opposite way!