Ylem Parto VDU (Vacuum Distillation Unit) takes the residuum from the ADU (Atmospheric Distillation Unit) and separates the heavier end products such as vacuum gas oil, vacuum distillate, slop wax, and residue.
This tower contains a combination fractionation trays and beds. It is equipped with three side draws and pump around sections for vacuum gas oil, vacuum distillate, and slop wax products.
The liquid from the feed furnace enters the tower bottoms, where it is collected and sent for further processing. Steam is injected into the base of the tower to reduce the hydrocarbon partial pressure by stripping some light boiling components from the bottoms liquid. The vapors from the feed heater enter the tower below tray 14.
At tray 14, a draw pan is located from which slop wax product is drawn. The slop wax product and pump around are cooled, with the slop wax product going to storage, while the pump around is returned to the tower at tray 11.
The next product draw, where the draw for vacuum distillate product is located. The vacuum distillate draw tray is a total draw tray, where the reflux from the tray is pumped under flow control to the tray below. The product and pump around are cooled, with the vacuum distillate product going to storage, while the pump around is returned to the tower at tray 7.
The last product draw, where the draw for vacuum gas oil product is located. The vacuum gas oil draw tray is also a total draw tray, where the reflux from the tray is pumped under flow control to the tray below. The product and pump around are cooled with the vacuum gas oil product going to storage, while the pump around is returned to the tower at tray 1.
The overhead from the VDU is condensed and combined with the vacuum steam. The slop oil and water are separated by gravity in the vacuum drum. The water is drained to disposal, while the slop oil is accumulated and occasionally drained to slop collection.
For further details or requirements, send Enquiry
