Reorganization of the operation of the evaporation and dehydration tower
Thread Content
Semi-regenerative continuous reforming, pre-hydrogenation unit, pre-hydrogenation followed by distillation; the evaporation tower operates under reduced pressure, with a pressure of 0.75 MPa, a top temperature of 67°C, a top reflux rate of 6.1 t/h, and an external discharge rate of 1.1 t/h. The bottom temperature is 194°C, while the temperature of the reboiler feed to the tower is 209°C. All quality parameters are within acceptable limits. Find the operating conditions of other devices and compare them.
With this operation, the liquefied gas is completely lost
Our conditions are: feed temperature of 140°C, pressure of 0.8 MPa, top temperature of 67°C, top reflux rate of 5.8 t/h, top discharge rate of -1.1 t/h, bottom temperature of 175°C, reboiler return temperature to the column of 168°C. The operation is stable and the quality is satisfactory; further adjustments should be possible.
The dry point isn’t under your control; in other words, the temperature at the bottom of the tower can vary significantly. As for the top of the tower, it depends on your production plan – if you’re producing PX, try to raise the initial boiling point as much as possible; if it’s gasoline, then just remove the C5 components.