Complete Naphtha Cracker – 800KT

Nameplate capacity: 300,000 t/y (feed gasoil), 260,000 t/y (feed VN IQ120) (1 compression line) (822 t/d × 365 d/y). Energetic index: 7,200 Kcal/Kg ethylene (1 compression line).

Facilities & Equipment

• Furnaces:
  • 4 Selas furnaces, duty 43×10⁶ Kcal/h
  • 5 Foster Wheeler furnaces, duty 15×10⁶ Kcal/h
  • 2 Foster Wheeler ethane-recycle furnaces, duty 15×10⁶ Kcal/h
• Feedstocks:
  • Gasoil 32 %
  • Virgin naphtha 54 %
  • Raffinate 13 %
  • LPG/C5 aromatics cut 1 %
  • Condensate (on availability)
• Charge-gas compressor
• Medium-temperature section
• Depropanation column
• Caustic tower (caustic concentration 4 %, consumption 2 kg/t ethylene)
• Cold section with Süd-Chemie catalyst G58C
• Ethylene chilling cycle with propylene compressor C1 (electric driver, 14 MW, 260,000 t/y ethylene)
• Compressor C6 (turbine driver, 14 MW, 186,000 t/y ethylene)
• Light-ends splitter:
  • Column run length: 1,500 days
  • Reboiler run length: 200 days
• Ethylene splitter (start-up 1986, capacity 300,000 t/y ethylene)
• Acetylene reactors:
  • Inlet temperature: 50 °C (I), 60 °C (II)
  • End-of-run temperature: 60 °C (I), 70 °C (II)
  • Regeneration cycle: 210 days
  • Molar ratio: 1.1 (I), 1.7 (II)
• MAPD reactors:
  • Catalyst: CCI C-31
  • Inlet temperature: 75 °C
  • Regeneration cycle: 4 years
  • Catalyst life: 28 years
• Compressor C3 (turbine driver)
• Compressor C8 (electric driver, 3.5 MW)
• Compressor C2 (back-pressure turbine CT-2A, 9 MW, suitable for one compression line)
• Compressor C7 (condensing turbine CT-7, 10.5 MW, suitable for two compression lines)

Complete naphtha cracker (start-up 2006).