What is difference between Adu and VDU?
The key difference between atmospheric distillation and vacuum distillation is that the atmospheric distillation is used to separate low boiling fraction of a mixture whereas vacuum distillation allows the components to be separated easily by lowering the boiling point of a high boiling fraction.
What is the purpose of VDU after Adu operation?
Therefore in the VDUs a vacuum is created to distill the hydrocarbons without cracking them. The residue from the ADU is pumped into the VDU where the pressure has been lowered below atmospheric pressure. At reduced pressure, the lighter portions of the residue from the ADU vaporize without cracking.
What is CDU in oil and gas?
The crude oil distillation unit (CDU) is the first processing unit in virtually all petroleum refineries and one of the most critical. The CDU distills the incoming crude oil into various fractions of different boiling ranges, each of which are then processed further in the other refining processing units.
What is the maximum temperature of crude oil heated in Adu?
Atmospheric crude distillation unit Crude oil exits from the desalter at temperature of 250 °C–260 °C and is further heated by a tube-still heater to a temperature of 350 °C–360 °C.
What is VDU in chemical engineering?
VDU full form is a vacuum distillation unit. In the chemical industry, various types of separation techniques are using and among those Distillation process is one of them. Distillation is a unit operation and we had discussed what is the distillation process and types of distillation.
What is the distillation temperature of diesel?
1 Diesel Fuel: A light distillate fuel oil that has distillation temperatures of 550 degrees Fahrenheit at the 90-percent point and meets the specifications defined in ASTM Specification D 975.
What is a CCR unit?
Central to these process units and streams is the Catalytic Reformer (CCR) unit. This unit takes low-value heavy naphtha from the CDU and converts it, after hydro-treating, into a higher- value high-aromatics, high-octane feedstock. Note: in this paper, CCR is used as a generic to indicate a catalytic reforming unit.