Case Study #2 Claus Process

• Let’s use Steps shown before to Draw a PFD.
• Process Description - Claus Process
  • The Claus process is a key method for converting hydrogen sulfide (H₂S) gas into elemental sulfur. 
  • It is widely used in refineries and natural gas processing plants to recover sulfur from H₂S-containing gas streams. 
  • Here is a step-by-step explanation of the Claus process:

Summary Process Steps:

• • Feed Gas Preparation:
    • Removing impurities from the feed gas.
  • Thermal Stage:
    • Partial combustion of H₂S to form SO₂ and elemental sulfur in the Claus furnace.
  • Waste Heat Recovery:
    • Cooling the gas and recovering heat as steam.
  • Sulfur Condensation:
    • Removing condensed sulfur in the first condenser.
  • Catalytic Stages:
    • Further conversion of H₂S and SO₂ to sulfur in catalytic reactors with inter-stage condensation.
  • Tail Gas Treatment:
    • Treating the tail gas to minimize sulfur emissions.