Presentation on Crude Distillation Unit (CDU)

In petroleum refining, the Crude Distillation Unit (CDU) (often referred to as the Atmospheric Distillation Unit) is usually the first processing equipment through which crude oil is fed. Once in the CDU, crude oil is distilled into various products, like naphtha, kerosene, and diesel, that then serve as feedstocks for all other processing units at the refinery.

1. Industrial Training Presentation Topic- Crude Distillation Unit (CDU) Presented By- Priyam Jyoti Borah Roll no- 16/275 Department- Chemical

2. Crude Oil Source Assam Crude (Sulphur 0.3%) Ravva Crude (Sulphur 0.1%) from the Ravva Oil fields of Andhra Pradesh) Imported Crude (through Heldia and Miri Crude) higher then 0.5% Sulpher content

3. CDU Unit consists of the following Sections Crude Preheat Desalter Fired Heater Crude Distillation Section Stripper Stabilizer Naphtha Splitter LPG Wash Section

4. Crude Distillation and Strippers Height of column: about 50m Number of trays: 38-45 Feed from fired heater enters under try 5 Pressure is maintained at 1.3-1.8 kg/cm2. Products- Distillate Bottom Products or residue to DCU

5. Stabilizer Column has 30 trays Top Temperature: 65°c Top pressure: 10kg/cm2 The purpose of the stabilizer is to stabilize naphtha by separating out liquefied petroleum gas (LPG) and other C-4 components. The fractionate of lower column or Kero II is used as heating medium for stabilizer reboiler. LPG withdrawn from Stabilizer reflux drum is first washed with caustic and then with water which is then sent to storage.

6. Function of Tray in a Distillation

7. Naphtha Splitter The stabilized naphtha is further spit into light naphtha (50-110°c) and heavy naphtha (110-180°c) in Spitter -I Splitter-I bottom is further split into reformer feed naphtha (110-150°c) and Kero -I components. Reboiler heating media for Splitter-II is reduced crude oil from mail fractionator column bottom.

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