Petrochemical Process

  • Petrochemical Process

Petrochemical Process

Vacuum Distillation

Vacuum distillation can also be referred as "low temperature distillation"

To further distill the residual oil from the atmospheric distillation column, the distillation must be performed at absolute pressures as low as 10 to 40 mmHg (also referred to as Torr) so as to limit the operating temperature to less than 370 to 380 °C.

The 10 to 40 mmHg absolute pressure in a vacuum distillation column increases the volume of vapor formed per volume of liquid distilled. The result is that such columns have very large diameters.

Many industries, other than the petroleum refining industry, use vacuum distillation on a much a smaller scale.
  • Operating Pressure : 10 torr ~ 40 torr
  • Configuration of a typical Vacuum Pump System
    • Inlet Condenser
    • Separator or Knock-Out Pot
    • Inlet Isolation Valve
    • Screw Dry Vacuum Pump
    • Jacket Type Exhaust Silencer or Exhaust Condenser


  • HOU (Heavy Oil Upgrading Unit)
    • VR HCR (Vacuum Residue Hydrocracker)
    • VGO FCC (Vacuum Gas Oil Fluidized Catalytic Cracking)
    • RFCC (Residue Fluid Catalytic Cracking Unit)
  • VDU (Vacuum Distillation Unit)
  • FPU (Feed Preparation Unit)
  • LOP (Lube Base Oil Plant)
  • Vacuum Dryer